Lasioglossum (Dialictus) coreopsis (Robertson)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 71-74

Lasioglossum (Dialictus) coreopsis (Robertson)

( Figures 79–83 )

Chloralictus cereopsis Robertson, 1902b: 249 . Lapsus calami .

Chloralictus coreopsis Robertson, 1902b: 250 .

Lectotype. Ƥ USA, Illinois, Macoupin Co., Carlinville, 23.vi.1891 (C. Robertson); [INHS: 11345] by W. E. LaBerge (in Webb 1980). Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) coreopsis , p. 1113 (catalogue); Mitchell, 1960: Dialictus coreopsis Ƥ3, p. 388 (redescription, key, synonymy); Krombein, 1967: Lasioglossum (Dialictus) coreopsis , p. 463 (catalogue); Moure and Hurd, 1987: Dialictus coreopsis , p. 96 (catalogue).

Diagnosis. Both sexes of L. coreopsis can be recognised by the following diagnostic combination: head elongate (length/width ratio = 1.09–1.13) ( Figs. 79 B, 81B) and mesoscutum coarsely tessellate, punctures sparse between parapsidal lines (i=1–2.5d) ( Figs. 80 , 82 ). They are most similar to L. longifrons , which has a much longer head (length/ width ratio = 1.20–1.21) ( Fig. 150 B).

Redescription. FEMALE. Length 4.00– 4.24 mm; head length 1.20–1.30 mm; head width 1.10–1.20 mm; forewing length 2.72–2.90 mm.

Colouration. Head and mesosoma golden green to bluish green. Clypeus with apical half blackish brown to yellowish brown. Antenna dark brown, flagellum with ventral surface brownish orange. Tegula brownish yellow. Wings subhyaline, venation and pterostigma pale brownish yellow. Legs brown, except medio- and distitarsi reddish brown, metabasitarsus infused with reddish brown. Metasomal terga and sterna golden brown, apical margins pale, translucent yellow.

Pubescence. Dull white. Head and mesosoma with moderately dense woolly hairs (1–1.5 OD), longest on genal beard, metanotum, and mesopleuron (2–2.5 OD). Paraocular area and gena with sparse subappressed tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately sparse, fine hairs. T1 acarinarial fan dense, complete, without dorsal opening. T2 basolaterally with sparse tomentum. T3–T5 with sparse tomentum not obscuring surface. T2–T4 apical margins with sparse fringes.

Surface sculpture. Face imbricate, punctation fine. Clypeus punctation (i=1–2.5d). Supraclypeal area with punctation moderately dense (i=1–3d). Lower paraocular and antennocular areas with punctation dense (i≤d). Upper paraocular area and frons punctate-reticulate. Ocellocular area obscurely punctate (i≤d). Gena and postgena lineolate. Mesoscutum coarsely tessellate-granulose, punctation sparse on disc (i=1–2.5d), denser laterad of parapsidal line and on anterolateral portion (i=1–1.5d). Mesoscutellum tessellate, submedial punctation sparse (i=1–4d). Axilla punctate. Metanotum imbricate. Preëpisternum rugulose-imbricate. Hypoepimeral area tessellate-imbricate. Mesepisternum rugulose-imbricate. Metepisternum with dorsal half rugoso-carinulate, ventral half imbricate. Metapostnotum weakly rugoso-carinulate, posterior margin imbricate. Propodeum with dorsolateral slope imbricate, lateral surface tessellate-imbricate, posterior surface tessellate. Metasomal terga weakly coriarious, punctation moderately dense basally (i=1–1.5d), apical impressed areas obscurely, sparsely punctate.

Structure. Head elongate (length/width ratio = 1.09–1.13). Eyes convergent below (UOD/LOD ratio = 1.38–1.43). Clypeus ½ below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets close (IAD/OAD <0.5).

Frontal line carinate, ending 3OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3– 4 branches. Metapostnotum truncate (MMR ratio = 1.25–1.38), posterior margin rounded onto posterior surface. Propodeum with oblique carina very fine or absent, lateral carina fine, reaching less than halfway to dorsal margin.

MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 3.75–4.11 mm; head length 1.20–1.22 mm; head width 1.08–1.13 mm; forewing length 2.72–2.84 mm.

Colouration. Legs brown, except tarsi brownish yellow.

Pubescence. Face below eye emargination with tomentum obscuring paraocular area, partially obscuring clypeus and supraclypeal area. Metasomal terga without tomentum. S4–S5 with lateral patches of medially directed hairs (1–1.5 OD).

Surface sculpture .. Metasomal terga punctation moderately dense (i=1–1.5d), apical impressed areas impunctate.

Structure. Head very elongate (length/width ratio = 1.09–1.11). Eyes strongly convergent below (UOD/LOD ratio = 1.58–1.61). Clypeus 1/2 below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets distant (IAD/OAD = 1.0). Frontal line carinate, ending 2.5OD below median ocellus. Pedicel subequal to F1. F2 length 1.4– 1.5X F1. F2–F10 moderately elongate (length/width ratio = 1.33–1.50). Metapostnotum normal (MMR ratio = 1.22– 1.42), posterior margin weakly angled onto posterior surface.

Terminalia . S7 with median lobe acuminate ( Fig. 83 ). S8 with apicomedial margin weakly convex ( Fig. 83 ). Genital capsule as in Fig. 83 . Gonobase with ventral arms narrowly separated. Volsella roughly ovoid. Gonostylus elongate, dorsal setae elongate. Retrorse lobe elongate, attenuated apically.

Range. Florida, north to Maryland, Delaware, west to Kansas, Texas ( Fig. 84 ). USA: DE, FL, GA, IL, KS, KY, MD, MO, MS, NC, SC, TN, TX, VA.

Additional specimens examined. USA: DELAWARE: 2ƤƤ Fenwick I., N38.6813 W075.0726, 26.viii.2006 (S.W. Droege); [ PCYU]; FLORIDA: 13 Mount Pleasant, 1.v.1952 (G.S. Walley); [ CNC]; 1Ƥ ( Halictus longiceps paratype) Inverness (C. Robertson); [ INHS]; GEORGIA: 13 Ware Co., Deenwood, N31.1319 W082.2307, 42 m, 16–18.vii.1916; [ AMNH]; KANSAS: 1Ƥ Douglas Co., N39˚2.68ʹ W095˚12.24ʹ, 26.viii.2004 (J. Hopwood); [ PCYU]; KENTUCKY: 1Ƥ Wayne Co., N36.924 W084.8715, 23–24.vii.2007 (S.W. Droege); [ PCYU]; MARYLAND: 1Ƥ Montgomery Co., Cabin John, N38.58310 W077.09290,52 m, 27.v.1915 (J.C. Crawford); [ AMNH]; 1Ƥ Caroline Co., N39.1098 W075.7724, 7.iv.2005 (S.W. Droege); [ PCYU]; MISSISSIPPI: 3ƤƤ Jackson Co., N30.5297 W088.6942, 4–5.vi.2005 (S.W. Droege); [ PCYU]; MISSOURI: 1Ƥ Newton Co., Diamond Grove Prairie, 20.vi.2005 (Arduser); [ PCYU]; NORTH CAROLINA: 4ƤƤ Swain Co., Andrews Bald Mountain, N35.54166 W083.49333 °, 1801 m, 25.vii.1923 (J.C. Crawford); 1Ƥ Wake Co., Raleigh, N35.77194 W078.63889, 14.vi.1924 (T.B. Mitchell); [ AMNH]; 3ƤƤ13 Hoke Co., Fort Bragg Mil. Res., 10–13.vi.1998 (B.N. Danforth); [ CUIC]; 1Ƥ E of Charlotte, N35.24474 W080.53715, 10.viii.2006 (C. Sheffield); [ PCYU]; 733 Horse Cove Bog, nr. Highlands, 2900 ft., 18.vii.1957 (J.G. Chillcott); [ CNC]; SOUTH CAROLINA: 6ƤƤ Dillon Co., Dillon, N34.41655 W079.37116, 34 m, 25.iv.1923; [ AMNH]; 2ƤƤ Chesterfield Co., N34.55 W080.26, 2007 (L. Housh); [ PCYU]; TEXAS: 2ƤƤ Denton Co., N33.2043 N097.0816, 27.iv.2002 (H.W. Ikerd); [ PCYU]; VIRGINIA: 13 Fluvanna Co., N37.7529 W078.1625, 2.x.2004 (S.W. Droege); [ PCYU].

Floral Records. ALISMATACEAE : Aisma plantago-aquatica; APIACEAE : Daucus carota , Eryngium , Zizia aurea ; AQUIFOLIACEAE : Ilex ; ASCLEPIADACEAE : Asclepias ; ASTERACEAE : Coreopsis palmata, C. tripteris , Erigeron annuus , Haplopappus , Helenium , Krigia biflora , Leucanthemum vulgare , Liatris gracilis , Mikania scandens , Pityopsis graminifolia tracyi , Rudbeckia hirta , R. subtomentosa , Senecio , Solidago canadensis , Solidago sempervirens mexicana , Symphyotrichum novae-angliae , S. pilosum ; BRASSICACEAE : Capsella bursa-pastoris , Lepidium virginicum , Warea carteri ; CACTACEAE : Opuntia austrina ; CAPRIFOLIACEAE : Symphoricarpos orbiculatus ; ERI- CACEAE: Rhododendron maximum ; EUPHORBIACEAE : Croton cascarilla ; FABACEAE : Amorpha fruticosa , Dalea , Galactia pinetorum , Medicago ; LAMIACEAE ; Piloblephis rigida , Pycnanthemum ; ONAGRACEAE : Oenothera ; PLANTAGINACEAE : Plantago ; POLEMONIACEAE : Polemonium reptans ; RANUNCULACEAE : Ranunculus ; RHAMNACEAE : Ceanothus ; ROSACEAE : Fragaria , Malus , Rubus , Spiraea ; RUBIACEAE : Houstonia purpurea ; SALICACEAE : Salix ; UNCERTAIN: “ Gerardia ”.

DNA Barcode. Available. Multiple sequences.

Comments. Common.

The name L. coreopsis is used in a more restricted sense than by some earlier authors due to the resurrection of a previously synonymous name (see L. longifrons below).

Figures

FIGURE 79. Lasioglossum coreopsis (Robertson) female, (A) lateral habitus, (B) face. Scale bars = 1 mm.

FIGURE 80. Lasioglossum coreopsis (Robertson) female, dorsal view of mesosoma.

FIGURE 81. Lasioglossum coreopsis (Robertson) male, (A) lateral habitus, (B) face. Scale bars = 1 mm.

FIGURE 82. Lasioglossum coreopsis (Robertson) male, dorsal view of mesosoma.

FIGURE 83. Lasioglossum coreopsis (Robertson) male terminalia, (A) ventral view, (B) dorsal view. Scale bar = 0.5 mm.

FIGURE 84. Distribution map of Lasioglossum coreopsis (stars) and L. creberrimum (circles).

FIGURE 150. Lasioglossum longifrons (Baker) female, (A) lateral habitus, (B) face. Scale bars = 1 mm.