Lasioglossum (Dialictus) tegulare (Robertson) Robertson, 2009

Gibbs, Jason, 2009, Integrative taxonomy identifies new (and old) species in the Lasioglossum (Dialictus) tegulare (Robertson) species group (Hymenoptera, Halictidae), Zootaxa 2032, pp. 1-38 : 13-18

Lasioglossum (Dialictus) tegulare (Robertson) , comb. n.

( Figures 6 A–D, 7A–C)

Halictus tegularis Robertson, 1890: 318 . Ƥ 3.

Chloralictus tegularis: Robertson, 1902: 248 (key).

Halictus (Chloralictus) tegularis: Viereck, 1916: 706 (key). Lasioglossum (Chloralictus) tegulare: Michener, 1951: 1118 (catalogue). Dialictus tegularis Mitchell, 1960: 423 (Ƥ 3 redescriptions).

Diagnosis. Females of L. tegulare can be recognized by the following combination of characters: head and mesosoma pale to golden green, paraocular area with sparse, subappressed hairs which do not obscure the surface, distinct microsculpture between punctures of mesoscutum and mesepisternum, and three or four teeth on the inner hind tibial spur (not including apex of rachis). Females of L. puteulanum have the head and mesosoma deep blue. Females of L. lepidii have dense subappressed hairs on the paraocular area which obscure the surface adjacent to the inner eye margin and lower paraocular area. Females of L. ellisiae have the integument of the mesoscutum (particularly adjacent to parapsidal lines) and mesepisternum smooth, with at most faint microsculpture which gives these areas a shiny appearance. Females of L. carlinvillense have only two teeth on the inner hind tibial spur.

Males of L. tegulare can be recognized by the following combination of characters: ventral surface of flagellum pale, appressed hairs of face mostly limited to paraocular areas and not obscuring clypeus, and T2–T3 punctures uniformly dense on disc basal to the premarginal line. Males of L. ellisiae have the ventral surface of the flagellum dark to ferruginous and T2–T3 punctures dense on basal half but sparse approaching premarginal line. Males of L. lepidii have the ventral surface of the flagellum bright yellow and appressed hairs of the face dense, obscuring the majority of the clypeus. Males of L. puteulanum have appressed hairs more uniformly distributed on face with less than half of the clypeal surface obscured.

Redescription. Female. Length: 4.7 (4.0–4.9) mm, fore wing length: 3.3 (2.8–3.5) mm head width: 1.4 (1.2–1.4) mm, head length: 1.3 (1.1–1.3) mm, n=20

Colouration. Head and mesosoma dull metallic pale green except the following: labrum brown-piceous; mandible base brown, apex red; clypeus brown, golden metallic above; supraclypeal area lighter green to golden; antennae brown, ventral surface of flagellomeres ruddy-brown except F8–F10 ventral surface testaceous; mesoscutum green to golden green; tegula piceous with central area ferruginous; legs brown, fore medio- and distitarsi reddish, apex of mid and hind distitarsi testaceous; wing venation and pterostigma testaceous-brown; wings faintly dusky; propodeum with green to blue reflections; metasoma piceous-brown; marginal zones of terga and sterna light brown.

Pubescence. Lower paraocular area with sparse, subappressed, plumose hairs; head and mesosoma with sparse, erect, plumose hairs (1–1.5OD), longer on metanotum and ventral surface of mesosoma (2OD); posterolateral margin of pronotum and pronotal lobe with dense, appressed tomentum; dense scopa on hind femur; propodeal lateral surface hairs (2OD) with long branches; acarinarial appressed fan complete; terga with sparse, erect hairs (1–2OD), more abundant on ventrolaterally reflexed portions; T3–T5 ventrolaterally reflexed areas with few erect hairs longer (2.5–3OD); T2–T3 basolateral areas and T4 dorsal surface with sparse appressed, plumose hairs; sterna with long, posteriorly oriented hairs emerging from apical half of disc (2–3OD); S1–S4 hairs with long branches.

Surface sculpture. Clypeus glabrate except upper margin imbricate, punctures moderately coarse (i=1–2d), fine above (i=d); supraclypeal area smooth and shining below, imbricate above, punctures fine (i=1–1.5d); lower paraocular area imbricate, glabrate below, punctures moderately coarse and deep (i<d); upper paraocular and frontal areas with punctures fine and shallow becoming reticulate centrally; gena lineolate, punctures fine and obscure; mesoscutum and mesoscutellum tessellate between fine punctures; mesoscutal punctures well spaced but not sparse in anteromedial and submedial areas (i=1–1.5d), dense on remainder of disc (i<d); mesoscutellum densely punctate medially and along margins, submedial area impunctate; pre-episternum rugulose; mesepisternum scabriculous, closely and coarsely punctate(i<d), punctures finer and more obscure below, hypoepimeral area punctulate; tegula finely punctate (i=1–1.5d), more sparsely punctate centrally; metapostnotum with anastomozing rugae, median stria reaching posterior margin, lateral striae coarser and more regular extending onto anterior half of lateral slope; posterior half of lateral slope dull due to microsculpture; lateral surface of propodeum scabriculous to tessellate with few, deep punctures (i>2d); metasoma coriarious with very fine obscure punctures, evenly spaced on T1–T4 (i=1.5d); anteriorly directed surface of T1 and dorsolateral portions anterior to premarginal line impunctate.

Structure. Head slightly broader than long; eyes convergent below (UOD:LOD = 1.25:1.0); clypeus protruding about one half below lower ocular tangent; distance from antennal sockets to clypeus, shorter than clypeus; antennal sockets distinctly nearer to each other than to inner eye margin; frontal line carinate ending 2OD from median ocellus; OOC less than IOC (1.0:1.5); eye wider than gena in lateral view; hypostomal carinae parallel; mesoscutum length to width (1.0:1.3); ratio of lengths of mesoscutellum: metanotum: dorsal surface of propodeum (1.8:1.0:1.4); tegula elongate, angulate posteromedially; inner hind tibial spur pectinate with three subapical teeth; oblique propodeal carina weakly evident, not contiguous with lateral carina.

Male. Length: 3.8 mm, fore wing length: 2.75 mm, head length: 1.1 mm, head width: 1.1 mm

Colouration. Head and mesosoma dull metallic green with faint golden reflections except gena with blue reflections; mesepisternum bluish-green below; propodeum bluish; the following parts dark brown-piceous: labrum; mandible except apex reddened; lower clypeus; antenna, lighter basally, F1–F3 testaceous ventrally; tegula; wing venation and pterostigma brown; wings hyaline, apex faintly dusky; metasoma.

Pubescence. Inter-antennal area and paraocular area from mandible base to emarginated portion of eye with subappressed hairs; head, mesosoma, anteriorly directed surface of T1 and ventrolaterally reflexed portions of terga with sparse, erect hairs (1.5–2OD); T1–T4 with short laterally oriented setae; sterna with erect hairs, densest on S4–S5.

Surface sculpture. Head and mesosoma glabrate and shining; clypeus (i<d), supraclypeal area (i=1–1.5d) and lower paraocular area (i=d) punctation fine and deep; upper paraocular area and frons reticulate; gena faintly imbricate-lineolate with obscure punctures; mesoscutum imbricate anteromedially; mesoscutal punctures on disc between parapsidal lines well spaced (i<1.5d), close laterally (i<d); mesoscutellum punctures close on margins and medial line (i<d), well spaced elsewhere (i=1.5d); pre-episternum rugulose; mesepisternum punctures moderately coarse and deep (i=d); metapostnotum irregularly striate, laterally striations extending onto anterior half of lateral slope; lateral and posterior propodeal surfaces shiny-imbricate with deep, moderately fine punctures (i=1–1.5d); terga smooth, very faintly coriarious; terga punctures fine but deep and distinct (i=1–1.5d), apically impressed areas impunctate; anteriorly directed surface of T1 largely impunctate.

Structure. Face length subequal to breadth; eyes convergent below (UOD:LOD = 1.5:1.0); clypeus protruding slightly more than one half below lower ocular tangent; antennal sockets slightly nearer to each other than to inner eye margin; frontal line carinate ending less than 2OD from median ocellus; OOC less than IOC; eye wider than gena from lateral view; hypostomal carinae parallel; pedicel subequal in length to F1; F2–F10 length 1.5 times breadth, F11 longer; ratio of lengths of mesoscutellum: metanotum: dorsal surface of propodeum (1.9:1.0:1.6); tegula enlarged, posterior margin not strongly angled; propodeal carina not evident between dorsal and posterior surfaces; metasoma narrow relative to female.

Terminalia . Median lobe of S7 narrow and elongate, sides subparallel, apex rounded ( Fig. 7 A); apical margin of S8 weakly convex ( Fig. 7 B); genitalia as shown in Fig. 7 C; gonostylus with few erect dorsal hairs near base; retrorse lobes elongate, attenuated apically, covered with fine setae.

Range. Vermont to South Carolina, west to Ontario, Kentucky and Tennessee.

Specimens examined. Holotype, USA, CONNECTICUT: HOLOTYPE Ƥ, N. Haven, 6.vi.1878, (WH Patton) (ANSP); RHODE ISLAND: 2 Ƥ, Newport Co., N41.4969 W71.3678, 22.vii.2005, (P Ostenton); MASSACHUSETTS: 1 Ƥ, Middlesex Co., Harvard:Oxbow NWR, Wallace Rd., 28.v.2006, (MF Veit); 1 Ƥ, Middlesex Co., Dunstable, sandpit 0.1mi E of airport, 29.iv.2006, (MF Veit) (PCYU); VERMONT: Windham Co., N42.4969 W71.3678, 22.vii.2005, (P Ostenton) (PCYU); NEW YORK: 1 Ƥ, Suffolk Co., 6.ix.2005, (SW Droege) [Barcoded]; 1 Ƥ, Suffolk Co., N41.13403 W72.3247, 8.ix.2005, (SW Droege); 1 Ƥ, Suffolk Co., 8.ix.2005, (SW Droege); 1 Ƥ, Suffolk Co., N41.05132 W71.9519, 7.ix.2005, (SW Droege); 2 Ƥ, Suffolk Co., 6.ix.2005, (SW Droege); (PCYU); 3 3, Tompkins Co., Buttermilk Falls S.P., Ithaca, 7.x.1967, (G & K Eickwort); 1 Ƥ, Tompkins Co., 6-mile Creek, SE Ithaca Reservoir, 25.v.1968, (G & K Eickwort); 1 3, Tompkins Co., Michigan Hollow, gravel pit, 5mi S of Danby, 7.ix.1968, (G & K Eickwort); 1 Ƥ, Albany Co., Partridge Run St. Game Area, 5mi N Rensselaerville, 6.vi.1970, (G & K Eickwort); 1 Ƥ, Albany Co., Rensselaerville, 28.vii.1970, (G & K Eickwort); 1 Ƥ, Albany Co., Rensselaerville, Huyck Reserve, 12.vi.1969, (G & K Eickwort); 1 3, Albany Co., Colonie, 20.viii.1969, (G & K Eickwort); 1 Ƥ, Cayuga Co., Fair Haven Beach S.P., 8.vi.1968, (G & K Eickwort); 1 Ƥ, Ludlowville, 6.vi.1968, (LL Pechuman); 1 3 & 3 Ƥ, Nassau Co., Jones Beach S.P., 31.vii.1974, (GC Eickwort); 1 3 & 1 Ƥ, Nassau Co., Jones Beach S.P., 26.vi.1976, (G Eickwort); 7 3, Nassau Co., Hempstead Lake S.P., 4–6.vii.1974, (GC Eickwort); 2 Ƥ, Nassau Co., Kennedy Wildlife Sanct., Tobay Beach, 18.vi.1989, (GC Eickwort); 1 Ƥ, Nassau Co., Tobay Beach, 24–26.vi.1976, (GC Eickwort); 1 3, Nassau Co., Floral Pk., 4.vii.1982, (D Yanega); 1 Ƥ, Montauk, 4.v.1947, (R Latham); 1 Ƥ, 3-mile Har., 6.vi.1941, (R Latham); 1 3, Van Cortland Pk., 20.vii.1913 (CUIC); 1 3, Queens Co., Floral Pk., Long I., 6.viii.1983, (D Yanega) (SEMC); NEW JERSEY: 1 Ƥ, Atlantic Co., 39 35’ N 74 46’ W, 21.vii.2003, (B Ahlstrom) (PCYU); 1 3, Weymouth, 26.vii.1923; 1 Ƥ, San Isle Junction, “May,25” (CUIC); 1 3, Ramsey, 10.vii.1913 (SEMC); MARYLAND: Camp Springs, 11.v.10, (JC Crawford); 1 Ƥ, Cabin John, 16.iv.1915, (JC Crawford); 1 Ƥ, Pr. George’s Co., N38.9764 W76.7491 20.vii.2002, (S Kolski); 1 Ƥ, Pr. George’s Co., N38.9591 W76.734 20.viii.2004, (S Kolski); 1 Ƥ, Pr. George’s Co., N39.002 W76.7505 20.viii.2004, (S Kolski); 3 Ƥ, Pr. George’s Co., N38.9977 W76.7573 30.ix–1x,2004, (S Kolski); 4 Ƥ, Anne Arundel Co., N38.7839 W76.7014, B Hollister (SEMC); 1 Ƥ, Calvert Co., N38.536 W76.518, 7.vii.2006, (M Gates); 1 Ƥ, Talbot Co., N38.8 W76.283, 7–8.v.2005, (W Steiner); 1 Ƥ, Caroline Co., N38.9194 W75.8279, 13.v.2007, (M Price); 1 3, Wicomico Co., N38.2909 W75.5364, 12.vi.2004, (SW Droege); 1 3, Anne Arundel Co., N38.7839 W76.7014, 21.ix.2004, (B Hollister); 1 3, Pr. George’s Co., N38.9893 W76.7322, 20.vii.2004, (S Kolski); 1 3 & 1 Ƥ, Pr. George’s Co., N38.9123 W76.755, 12–13.viii.2003, (Haramis & Archer); 2 Ƥ, Pr. George’s Co., N38.9123 W76.755, 13–14.viii.2003, (Haramis & Archer); 1 Ƥ, Pr. George’s Co., N38.9123 W76.755, 28–29.viii.2003, (Haramis & Archer); 1 Ƥ, Pr. George’s Co., N38.9123 W76.755, 26–27.viii.2003, (Haramis & Archer); 2 Ƥ, Pr. George’s Co., N38.9123 W76.755, 14–15.viii.2003, (Haramis & Archer); 1 Ƥ, Pr. George’s Co., N38.9959 W76.7886, 2.ix.2004, S Na; 1 Ƥ, Caroline Co., N39.1098 W75.7724, 7.iv.2005, (SW Droege) (PCYU); 6 Ƥ, Prince Georges Co., Temple Hills, 22.viii.1976, (GC Eickwort) (CUIC); WASHINGTON, D.C.: 2 Ƥ, N38.931 W77.116, 24.vi.2006, Pascarella; 1 3, N77.034 W38.885, 18–19.x.2004, (E Keto); 1 3, N38.9463 W77.0344, 16.vi.2004, (SW Droege); 1 Ƥ, N38.8871 W77.0128, 1.ix.2005, (NB Staff); 1 Ƥ, Mall, N38.8912 W777.0242, 16.viii.2006, (SW Droege); 1 3, N38.891 W77.0308, 15–16.vii.2004, (C Osborn); 1 3, N38.879 W77.0333, 13–14.vii.2004, (C Osborn); 1 3, N77.0261 W38.8694, 4–5.x.2004, (E Keto) (PCYU); VIRGINIA: 3 Ƥ, Assateague I., N37.9625 W75.3108, 30.vi–1.vii.2006, (SW Droege) [Barcoded]; 1 Ƥ, Assateague I., N37.9576 W75.3147, 30.vi–1.vii.2006, (SW Droege); 1 Ƥ, Assateague I., N37.9377 W75.3177, 30.vi–1.vii.2006, (SW Droege) [Barcoded]; 1 Ƥ, Assateague I., N37.9486 W75.3136, 2.vii.2006, (SW Droege); 1 Ƥ, Assateague I., N37.9086 W75.3564, 1–2.vii.2006, (SW Droege); 1 Ƥ, Virginia Beach, N36.917 W75.3564, 16–17.vi.2007, (W Steiner); 1 Ƥ, Fluvanna Co., N37.753 W78.162, 2.x.2004, (SW Droege) [Barcoded]; 1 Ƥ, Accomack Co., N37.938 W75.318, 30.vi–1.vii.2006, (SW Droege); 1 Ƥ, Hwy 340, 10km N of Shenandoah, N38.564 W78.606, 7.vi.2005, (A Zayed) [Barcoded] (PCYU); 2 Ƥ, Clarke Co., Blandy Exp. Farm E Boyce, 12–14.vi.1986, (JK Liebherr) (CUIC); WEST VIRGINIA: 2 Ƥ, Hampshire Co., N39.346 W78.403, 29–30.v.2004, (SW Droege) [Barcoded]; 1 Ƥ, Hampshire Co., N39.351 W78.509, 29–30.v.2004, (SW Droege) [Barcoded]; 1 3, Hampshire Co., N39.2334 W78.6843, 11.vii.2002, (SW Droege); 1 3, Hampshire Co., N39.31 W78.54, 11.vii.2002, (SW Droege); 1 3, Hampshire Co., N39.3012 W78.4358, 11.vii.2002, (SW Droege); 1 3, Hampshire Co., N39.4401 W78.4872, 7.vii.2002, (SW Droege); 1 3, Hampshire Co., N39.2886 W78.4819, 11.vii.2002, (SW Droege) (PCYU); 1 Ƥ, Hampshire Co., N39.415 W78.5012, 7.vii.2002, (SW Droege); 1 Ƥ, Hampshire Co., N39.333 W78.4585, 6.vii.2002, (SW Droege) (SEMC); KENTUCKY: 15 Ƥ, Wayne Co., N39.924 W84.8715, 23–24.vii.2007, (SW Droege); 1 Ƥ, Laurel Co., N37.1528 W84.1167, 27.vii.2007, (SW Droege) (PCYU); TENNESSEE: 1 Ƥ, Rutherford Co., N35.8275 W86.2912, 20.vii.2007, (D Green); 1 Ƥ, Rutherford Co., N35.8197 W86.3159, 20.vii.2007, (D Green) (PCYU); NORTH CAROLINA: 1 Ƥ, Union Co., N34.984 W80.449, ix–x.2003, (R Jackowski) [Barcoded]; 1 Ƥ, Great Smoky Mountains National Park, Cataloochee overlook, N35.54 W83.06, 6.viii.2006, (J Gibbs); 1 3, Highlands, 22.vii.1958, (TB Mitchell); 1 Ƥ, Pettigrew S.P., 27.v.1959, (TB Mitchell) (PCYU); 6 3 & 1 Ƥ, Beutenmuller, Black Mts., viii.1912; SOUTH CAROLINA: 1 3 & 1 Ƥ, Okanee Co., near Walhalla, N34.813 W83.137, 9.viii.2006, (J Gibbs) [Barcoded]; 1 Ƥ, Chesterfield Co., N34.637 N80.176, 18–19.v.2006, (SW Droege); 5 Ƥ, Chesterfield Co., N34.55 W80.26, 2007, (L Housh) (PCYU); GEORGIA: 2 Ƥ, Athens, 15.vi.1909, (JC Bradley); 1 3, Cobb Co., Lost Mount, 13.vii.1913; 1 3, Rabun Bald, 4000–4800ft, 21.viii.1913; CANADA, ONTARIO, 1 3, Norfolk, N42.6497 W80.5729, 11.viii.2007, (A Taylor); 5 Ƥ, Norfolk, N42.6493 W80.5687, 11.vi.2007; 1 3, Caledon, Gschwendtner property, N43.8148 W79.9768, 18.ix.2003, (J Grixti) (PCYU).

Type depository. ANSP.

Etymology. No explanation is given for the name in the original description but the species was undoubtedly named for the remarkable shape of the tegula.

Comments. The range of L. tegulare is evidently more restricted than previously reported ( Moure & Hurd 1987). Northwestern and southeastern records likely correspond to one or other of the species described below. Some records from Texas could be misidentifications of L. coactum (Cresson) , which differs in having deeply impressed marginal zones of T1 and T 2 in both sexes.

Figures

FIGURE 6. Lasioglossum tegulare A) face of female holotype; B) lateral habitus of female holotype; C) face of male; D) lateral habitus of male.

FIGURE 7. Lasioglossum tegulare terminal structures of male. Diagram of genitalia with ventral and dorsal sides pictured on left and right, respectively (above), diagram of S 7 (middle) and diagram of S 8 (below).