Lasioglossum Curtis 1833

Key to Nearctic Lasioglossum groups with enlarged tegula 1. Head and mesosoma black to brown ................................................................................................ 2 – Head and mesosoma metallic golden, green, or blue ....................................................................... 3 2. Mesepisternum rugose .............................................. L. (Hemihalictus) kincaidii (Cockerell, 1898) – Mesepisternum imbricate ..................................... L. (Hemihalictus) glabriventre (Crawford, 1907) 3. Metasoma with no appressed tomentum in either sex (but with abundant simple setae); S2–S4 with long (2–4 OD), dense, scopa-like pubescence in males ..................................................................... ............................. L. (Dialictus) knereri Gibbs, 2010 (atypical forms only known from California) – Metasoma with some appressed tomentum at least on T2–T3 basolateral areas in females; S2–S4 with shorter (1–2 OD) and sparser pubescence in males, not scopa-like ......................................... 4 4. T1 with lateral tomentum (except in some males); clypeus projecting more than 50% below suborbital tangent; propodeum oblique carina absent in both sexes ................................................................... .......................................................................................... L. (Dialictus) perdifficile species complex – T1 without lateral tomentum in either sex; clypeus projecting about 50% below suborbital tangent; propodeum oblique carina present in females (but may be fine and difficult to distinguish from background surface sculpture) ........................................ L. (Dialictus) gemmatum species complex Key to females 1. Mesoscutum with appressed, fine, stubble-like setae less than 0.25 OD long, appearing shaved, and erect plumose setae about 1 OD long or less, these setae very sparse (each seta separated by about its length from the one nearest it, with some gaps about a seta’s length wide visible in lateral view) (Fig. 78A–B); mesoscutum golden-green to coppery, contrasting with blue to blue-green propodeum; size very small (ITS 0.67–0.77 mm); metasoma black .................................................................... 2 – Mesoscutum with appressed, fine setae 0.25–0.5 OD long and erect plumose setae about 1 OD long, these setae dense (each seta within its length from the one nearest it, with no gaps wider than half a seta’s length visible in lateral view) (Fig. 78C–D); mesoscutum usually concolourous with propodeum; size larger (ITS normally> 0.77 mm, except in L. gloriosum sp. nov., L. indagator sp. nov., and L. rufodeludens sp. nov., in which the metasoma is red-orange) ................................. 3 2. Tegula sparsely punctate (IS = 1–4 PD) at least laterally, not exceeding posterior margin of mesoscutum in dorsal view, with inner posterior margin straight, coming to a blunt angle posteriorly (Fig. 79A); apical rims of T1–T3 minutely punctate (Fig. 80A) (deserts of southern United States and northern Mexico) .................................................................................................... L. perparvum (Ellis, 1914) – Tegula densely punctate (IS <1 PD), exceeding posterior margin of mesoscutum in dorsal view by almost 1 OD, with inner posterior margin concave and a rounded projection reaching axilla posteriorly (Fig. 79B); apical rims of T1–T3 impunctate (Fig. 80B) (Neotropical Mexico, rarely occurring north to United States border) ................................................................................ L. magnitegula sp. nov. 3. Tegula impunctate except on extreme anterior margin (Fig. 81A) ................................................... 4 – Tegula with at least a few distinct punctures medially, usually many (Fig. 81B–C) ........................ 7 4. Tegula dark brown; mesoscutum coarsely punctate (punctation similar to mesepisternum) ............. ......................................................................................................................... L. profundum sp. nov. – Tegula yellow-orange; mesoscutum more finely punctate (punctures smaller than those of mesepisternum) ................................................................................................................................. 5 5. Mesoscutum and mesepisternum completely dull, tessellate to imbricate; metasoma entirely redorange (eastern Texas, Nuevo Leon, and Tamaulipas) ................................ L. rufodeludens sp. nov. – Mesoscutum lateral and posterior margins and/ or mesepisternum shiny with at most weak microsculpture (rarely both dull); at least basal half of discs of metasomal terga reddish brown to black (apical areas may be red-orange or black) .............................................................................. 6 6. Postgena smooth and shiny (as in Fig. 82A) (Chihuahuan and Sonoran Deserts) ............................. ............................................................................................................................. L. deludens sp. nov. – Postgena dull, lineolate (as in Fig. 82B) (Florida Keys and Bahamas) .............................................. ................................................................................................. L. surianae (Mitchell, 1960) [in part] 7. Mesoscutum, preëpisternum, mesepisternum, and hypoepimeron margins fringed with appressed tomentum (Fig. 83A); metepisternum covered in dense tomentum obscuring the surface; metanotum median third covered in dense pubescence obscuring the surface (Fig. 83A); tegula and metasoma bright red-orange .............................................................................................................................. 8 – Mesoscutum and pleura without appressed tomentum (except sometimes mesoscutum anterolateral margins or metepisternum with sparse tomentum not obscuring the surface) (Fig. 83B); metanotum with dense pubescence limited to anterior margin (Fig. 83B); tegula and metasoma usually black to brown (if red-orange, then lacking the other characters) .................................................................. 9 8. Mesepisternum with most punctures separated by half a puncture diameter or less (IS <0.5 PD) (Fig. 84A); tegula outer margin densely punctate (IS ≤ 1 PD) (Nevada, Utah, and northern New Mexico) ............................................................................................................. L. gloriosum sp. nov. – Mesepisternum with most punctures separated by up to one puncture diameter or slightly more (IS ≤1 PD) (Fig. 84B); tegula outer margin sparsely punctate (IS = 1–3 PD) (southern Arizona, New Mexico, and Texas) ............................................................................................ L. indagator sp. nov. 9. T2–T3 usually each slightly convex with apical rim distinctly downcurved in lateral view (Fig. 85A); T3 usually with dense and complete subapical band of tomentum (Fig. 86A); disc of T2 with deep and dense punctures (IS ≤ 1 PD) reaching premarginal line and contrasting with largely impunctate apical rim (Fig. 86A) (Colorado to Veracruz) .......................................... L. coactus (Cresson, 1872) – T2–T3 each flat in lateral view and apical rim continuous with contour of disc (Fig. 85B); T3 without subapical band of tomentum or this band sparse and broadly interrupted medially (except in L. stictaspis and L. tegulariforme, in which the disc of T2 has finer and sparser punctures (IS = 1–3 PD) either becoming inconspicuous near premarginal line or extending onto apical rim) (Fig. 86B) ............ 10 10. Tegula relatively large (maximum length more than half ITS and reaching or exceeding posterior margin of mesoscutum in dorsal view), densely punctate throughout (IS <1 PD), and usually with inner posterior margin deeply concave, forming a broadly rounded posterior projection about the size of 0.5–1 lateral OD (Fig. 87A) (United States west of ~99° and Mexico) ......................................11 – Tegula relatively small (maximum length about half ITS or less and at most reaching posterior margin of mesoscutum in dorsal view), more sparsely punctate medially (IS ≥ 1 PD), and with inner posterior margin straight or weakly concave, forming a sharp posterior angle or point smaller than 0.5 lateral OD (Fig. 87B) (if tegula larger or more densely punctate, then occurring in United States east of ~99°) .................................................................................................................................... 17 11. Metapostnotum smooth with fine, subparallel rugae and completely dull due to fine reticulate microsculpture (Fig. 88A) .............................................................................................................. 12 – Metapostnotum roughened with strong, usually anastomosing rugae (except usually subparallel in L. gaudiale) and shiny basally between rugae due to weak microsculpture (Fig. 88B) ................. 13 12. Face slightly longer on average (length/width ratio 0.8–0.85) (Fig. 89A); mesepisternum densely punctate (IS <1 PD) and usually shiny; mesoscutum uniformly dull due to strong tessellate microsculpture; in Nearctic region, T1–T2 apical rims distinctly punctate with no change in sculpture across premarginal line (impunctate in Neotropics) ................. L. pseudotegulare (Cockerell, 1896) – Face slightly shorter on average (length/width ratio 0.77–0.84) (Fig. 89B); mesepisternum usually dull or more sparsely punctate (with some IS ≥1 PD) and/or mesoscutum shiny at least on lateral and posterior margins; T1–T2 apical rims impunctate or punctures much sparser and finer than on discs ........................................................................................ L. stictaspis species complex [in part] 13. T1 disc with impunctate median line 1 OD wide or slightly le

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