Lasioglossum (Dialictus) succinipenne (Ellis)

Gibbs, Jason, 2010, Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini) 2591, Zootaxa 2591 (1), pp. 1-382 : 317-321

Lasioglossum (Dialictus) succinipenne (Ellis)

( Figures 217A–C , 218A–F )

Halictus succinipennis Ellis, 1913: 205 . ♀. Holotype. ♀ USA, Colorado, Florissant , 14.vi.1948 on sand (S.A. Rohwer); [NMNH: 28200]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) succinipenne , p. 1118 (catalogue); Hurd, 1979: Dialictus succinipennis , p. 1972 (catalogue); Dialictus succinipennis , p. 1972 (catalogue); Moure & Hurd, 1987: Dialictus succinipennis , p. 132 (catalogue).

Diagnosis. See the diagnosis for L. pilosum .

Redescription. FEMALE. Length 4.76–6.10 mm; head length 1.39–1.66 mm; head width 1.27–1.56 mm; forewing length 3.23–4.15 mm.

Colouration. Head and mesosoma pale green to golden green. Clypeus with apical half blackish brown and basal half, and supraclypeal area bronze. Antenna dark brown, flagellum with ventral surface reddish brown at apex to orange-yellow. Tegula translucent amber. Wing membrane subhyaline, venation and pterostigma pale brownish yellow. Legs brown, protibial base and medio- and distitarsi reddish brown. Metasomal terga bluish green, sterna brown, apical margins reddish to translucent yellow.

Pubescence. Dull white. Dense. 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 subappressed tomentum sometimes partially obscuring surface. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with dense, fine setae. T1 acarinarial fan complete and dense. T1 dorsolaterally, T2 basally and laterally, and T3–T4 entirely with dense tomentum obscuring surface. T2 apicolateral and T3–T4 apical margins with moderately dense fringes.

Surface sculpture. Face imbricate, punctation fine. Clypeus polished, basal margin weakly imbricate, punctation moderately sparse (i=1–2.5d). Supraclypeal area with punctation moderately sparse (i=1–2d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i<1.5d). Upper paraocular area and frons punctate-reticulate. Ocellocular area ruguloso-punctate (i≤d). Gena and postgena lineolate. Mesoscutum imbricate, punctation moderately fine, contiguous on medial portion of disc (i<d), reticulate-punctate laterad and mesad of parapsidal lines and on anterolateral portions. Mesoscutellum polished, submedial impunctate area small. Axilla punctate. Metanotum ruguloso-imbricate. Preëpisternum rugulose. Hypoepimeral area rugulose. Mesepisternum rugulose. Metepisternum with dorsal half rugoso-striate, ventral half imbricate. Metapostnotum incompletely rugoso-striate, posterior margin imbricate. Propodeum with dorsolateral slope and lateral and posterior surfaces ruguloso-imbricate. Metasomal terga weakly coriarious. punctation fine, on basal halves dense (i=d), moderately dense on apical halves (i=1–2d).

Structure. Head elongate (length/width ratio = 1.05–1.09). Eyes convergent below (UOD/LOD ratio = 1.19–1.23). Clypeus 2/3 below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/OAD <0.5). Frontal line carinate, ending 2 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3–4 teeth. Metapostnotum moderately elongate (MMR ratio = 1.21–1.25), posterior margin weakly angled onto posterior surface. Propodeum with oblique carina fine, lateral carina short, not reaching dorsal margin.

MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 5.92– 6.15 mm; head length 1.68–1.92 mm; head width 1.39–1.66 mm; forewing length 4.21–4.45 mm.

Colouration. Labrum, mandible and distal margin of clypeus yellow. Flagellum with ventral surface orange. Legs brown, tibial bases and apices and tarsi yellow.

Pubescence. Moderately dense. Face below eye emargination with tomentum obscuring paraocular area, partially obscuring clypeus and supraclypeal area. T1 acarinarial area with sparse fan of appressed hairs. T2– T3 basolaterally and T4 basally with sparse tomentum. S2–S3 entirely and S4 laterally with posteriorly directed hair patches (1–1.5 OD).

Surface sculpture. Propodeum with dorsolateral slope and lateral and posterior surfaces rugulose. Metasomal terga with deep, distinct punctation.

Structure. Head very elongate (length/width ratio = 1.09–1.21). Eyes convergent below (UOD/LOD ratio

= 1.38–1.48). Clypeus 3/4 below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets distant (IAD/OAD> 1.0). Frontal line carinate, ending 2 OD below median ocellus. Pedicel subequal to F1. F2 length 1.5X F1. F2–F11 moderately short (length/width ratio = 1.31–1.70). Metapostnotum truncate (MMR ratio = 1.32–1.45), posterior margin weakly angled onto posterior surface. Propodeum with oblique carina virtually absent, lateral carina short, not reaching dorsal margin.

Terminalia . S7 with median lobe weakly clavate, sides weakly concave, apex rounded ( Fig. 218E ). S8 with apicomedial margin weakly convex ( Fig. 218E ). Genitalia as in Fig. 218E–F . Gonobase with ventral arms widely separated. Gonostylus small, dorsal setae elongate. Retrorse lobe elongate, weakly attenuated apically.

Range. Alberta and Manitoba south to Colorado, west to Illinois and southern Ontario ( Fig. 219 ).

Additional material examined. CANADA: ALBERTA: 1♀ CFB Suffield, Amiens , N50°37.678´W110°18.371´, 29.vi.1994 (Finnamore & Pollock) ; 1♀ 1♂ CFB Suffield, Amiens , N50°37.678´W110°18.371´, 28.vii.1994 (Finnamore & Pollock) ; 2♀ CFB Suffield, Amiens , N50°37.678´W110°18.371´, 16.viii.1994 (Finnamore & Pollock) ; MANITOBA: 1♀ YellowQuill Mxd. Grass Prairie Preserve, near Treesbank , N49°50´51´´ W099°33´15´´, 1.vi.2005 (A.M. Patenaude) ; 2♀ YellowQuill Mxd. Grass Prairie Preserve, near Treesbank , N49°50´51´´ W099°33´16´´, 1.vi.2005 (A.M. Patenaude) ; 1♀ YellowQuill Mxd. Grass Prairie Preserve, near Treesbank , N49°50´51´´ W099°33´16´´, 29.viii.2005 (A.M. Patenaude) ; 1♀ YellowQuill Mxd. Grass Prairie Preserve, near Treesbank , N49°41´28´´ W099°34´29´´, 20.vii.2005 (A.M. Patenaude) ; 1♀ YellowQuill Mxd. Grass Prairie Preserve, near Treesbank , N49°41´28´´ W099°34´29´´, 22.viii.2005 (A.M. Patenaude); [ PCYU] ; USA: COLORADO: 1♀ Elbert Co., Running Creek Field Sta. , 6950 ft., 2.vii.1982 (F.M. Brown); [ CUIC] ; 8♀ Jefferson Co., N39.731 W105.244, 21.viii.2001 (S.W. Droege) ; 4♀ Larimer Co., N40.6833 N105.3975, 11–12.v.2004 (S.W. Droege) ; IOWA: 1♀ Dickinson Co., Santee Prairie , 433 m, 14.6 km NW Milford, N43°25´36´´ W095°14´39´´, 17.viii.2004 (K. Kwaiser) ; NEBRASKA: 4♀ Douglas Co., N41.2796 W095.9073, 10.v.2007 (S.W. Droege) ; WISCONSIN: 1♀ Sauk Co., Spring Green Preserve , N43.19785 W090.05904, 23.vii.2006 (A. Wolf); [ PCYU] .

Floral records. ANACARDIACEAE : Rhus copallinum , ASTERACEAE : Cirsium canescens , BRASSI- CACEAE: Physaria , COMMELINACEAE : Tradescantia ohiensis , FABACEAE : Chamaecrista fasciculata , SCROPHULARIACEAE : Scrophularia lanceolata .

Comments. Common. First description of male. Females of this species will be very difficult to distinguish from L. pilosum using morphology. DNA barcodes clearly differentiate the two species.

Figures

FIGURE 217. Lasioglossum succinipenne (Ellis). Female (A) lateral habitus; (B) dorsal habitus; (C) face. Scale bars, A– C = 1 mm.

FIGURE 218. Lasioglossum succinipenne (Ellis). Male (A) lateral habitus; (B) dorsal habitus; (C) face; (D) mesepisternum; (E) ventral view of genital capsule, S7, S8; (F) dorsal view of genital capsule. Scale bars, A–C = 1 mm, F = 0.5 mm.

FIGURE 219. Distribution of Lasioglossum succinipenne (medium grey), L. taylorae (dark grey), and L. tegulare (light grey).