Lasioglossum (Dialictus) taylorae Gibbs, 2010

Gibbs, Jason, 2010, Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini) 2591, Zootaxa 2591 (1), pp. 1-382 : 321-323

Lasioglossum (Dialictus) taylorae Gibbs , new species

( Figure 220A–C )

Holotype. ♀ CANADA, ONTARIO, Lambton Co., N43°13.981' W081°51.90', 20.vi.2008 (A. Taylor); [ PCYU: ANT 5667 ]

Diagnosis. Females of L. taylorae can be recognised by the diagnostic combination of an elongate head (length/width ratio = 1.00–1.07), sparse mesoscutal punctures between parapsidal lines (i=1–2.5d), incomplete metapostnotal rugae reaching only 2/3–3/4 distance to posterior margin, metasomal terga polished brown, T1 fan with wide dorsal opening, T2–T3 with small basolateral patches of tomentum, and apical impressed area of the T2 punctate. They are most similar to L. planatum which have the apical impressed area of T2 impunctate.

Male unknown.

Description. FEMALE. Length 4.96–5.75 mm; head length 1.49–1.56 mm; head width 1.44–1.49 mm; forewing length 3.87–4.05 mm.

Colouration. Head and mesosoma green with blue and gold reflections. Clypeus with apical margin blackish brown, remainder and supraclypeal area brassy. Antenna dark brown, F8–F10 with ventral surface yellow-orange to brown. Tegula reddish amber. Wing membrane subhyaline, venation and pterostigma pale amber. Legs brown, medio- and distitarsi reddish brown. Metasoma dark brown, terga and sterna with apical margins reddish brown.

Pubescence. Dull white. Sparse. Head and mesosoma with moderately dense woolly hairs (1–1.5 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Gena with very sparse subappressed hairs. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with sparse, fine setae. T1 acarinarial fan with dorsal opening equal in width to lateral hair patches. T2– T3 basolateral areas with sparse tomentum. T4 with tomentum sparsely scattered across disc.

Surface sculpture. Face imbricate. Clypeus polished, weakly imbricate, punctation strong (i=1–3d). Supraclypeal area polished or weakly imbricate medially, punctation moderately sparse (i=1–2.5d). Lower paraocular area punctation dense (i≤1d). Antennocular area punctation moderately sparse (i=1–1.5d). Upper paraocular area and frons reticulate. Ocellocular area distinctly punctate (i=d). Gena lineolate. Postgena polished. Mesoscutum imbticate anteromedially, remainder weakly imbricate to moderately polished, punctation fine, sparse between parapsidal lines (i=1–2.5d), close laterad of parapsidal lines (i≤d), contiguous on anterolateral portion. Mesoscutellum polished, submedial punctation moderately dense (i=1–2d). Axilla punctate. Metanotum imbricate. Preëpisternum rugulose. Hypoepimeral area weakly ruguloso-imbricate. Mesepisternum rugulose dorsally, weakly ruguloso-imbricate ventrally, sometimes with obscure punctation throughout. Metepisternum with dorsal half striate, ventral half imbricate. Metapostnotum rugoso-striate reaching 2/3–3/4 distance to posterior margin, posterior portion imbricate. Propodeum with dorsolateral slope rugulose, lateral surface rugulose-tessellate, posterior surface imbricate. Metasomal terga polished, weakly coriarious, punctation on basal halves sparse (i=1–2d), apical impressed area punctate laterally.

Structure. Head moderately wide (length/width ratio = 1.00–1.07). Eyes convergent below (UOD/LOD ratio = 1.23–1.28). Clypeus projecting 1/2–2/3 below suborbital line, apicolateral margins convergent. Antennal sockets close (IAD/OAD ratio <0.5). OOD less than IOD. Gena narrower than eye. Inner metatibial spur pectinate with 3–4 teeth. Metapostnotum moderately elongate (MMR ratio = 1.08–1.25). Propodeum with oblique carina virtually absent, lateral carina not reaching dorsal margin.

MALE: Unknown.

Range. Ontario south to the District of Columbia ( Fig. 219 ).

Paratypes. CANADA: ONTARIO: 1♀ topotypical, 7.vii.2007 (A. Taylor) ; 1♀ Lambton Co., N43°14.055ʹ W081°51.522ʹ, 21.vi.2007 (A. Taylor) ; 1♀ Lambton Co., N43°15.317ʹ W081°49.867ʹ, 22.vi.2007 (A. Taylor) ; 1♀ Lambton Co., N43°14.019ʹ W081°51.635ʹ, 20.vi.2008 (A. Taylor); [ PCYU] ; USA: DISTRICT OF COLUMBIA: 1♀ N38.9309 W077.116, 24.vi.2006 (Pascarella); [ PCYU] ; WISCONSIN: 1♀ Brown Co., UWGB Mahon Woods , N44.5279 W87.93314, 24.v.2005 (J. Watson) ; 1♀ Marinette Co., Dunbar State Natural Area , N44.66229 W88.25097, 16.vi.2005 (J. Watson) ; 3♀ Marinette Co., Dunbar State Natural Area , N44.66229 W88.25097, 16.vi.2005 (J. Watson) ; 1♀ Marinette Co., Dunbar State Natural Area , N44.66229 W88.25097, 10.vii.2005 (J. Watson) ; 2♀ Marinette Co., Dunbar State Natural Area , N44.66229 W88.25097, 31.vii.2005 (J. Watson); [ ARC] .

Etymology. The specific epithet is named for Alana Taylor who collected the original specimens assigned to this species.

Comments. Lasioglossum taylorae belongs to the L. viridatum species group.

Figures

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

FIGURE 220. Lasioglossum taylorae new species. Female (A) lateral habitus; (B) dorsal habitus; (C) face. Scale bars, A–C = 1 mm.