Dialictus occidentalis Crawford 1902: 318 Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini) 2591 Gibbs, Jason Zootaxa 2010 2010-08-31 2591 1 1 382 6P2DG (Crawford) Crawford 1902 [151,747,551,577] Insecta Halictidae Lasioglossum Animalia Hymenoptera 219 220 Arthropoda species occidentale Dialictus  ( Figures 161A–E, 162A–F)    Dialictus occidentalisCrawford 1902: 318. ♀.     Holotype. ♀ USA, New Mexico, Las Vegas, 4.vii., (Cockerell), [ NMNH: 3406]. Examined   Dialictus TheodoriCrawford 1902: 318. ♀. [new synonymy].   Holotype. ♀ USA, New Mexico, Las Vegas,  29.v.1902, on  Convolvulus incanus(P. Hitchcock); [ ANSP: 10091]. Examined.   Halictus galeiCockerell 1919: 272. ♀.   Holotype. ♀ USA, Colorado, Gold Hill, Colorado,  12.vii.1919, ( T. & W. Cockerell), [ NMNH: 40261]. Examined.  Taxonomy.Cockerell 1901:  Halictus anomalus, ♀(misdet), p. 126 (description); Michener, 1951:  Lasioglossum( Dialictus) occidentale, p. 1115,  L.( D.) theodori, p. 1119 (catalogue); Hurd, 1979:  Dialictus occidentale, p. 1969,  D. theodori, p. 1972 (catalogue); Moure & Hurd, 1987:  Dialictus occidentalis, p. 117,  D. theodori, p. 135 (catalogue).   Diagnosis.See diagnosis for  L. anomalum.   Redescription.FEMALE. Length 4.15–5.73 mm; head length 1.39–1.49 mm; head width 1.32–1.49 mm; forewing length 3.42–3.60 mm.  Colouration.Head and mesosoma greenish blue. Clypeus with apical half blackish brown and basal half, and supraclypeal area more green or bronze. Antenna dark brown, flagellum with ventral surface reddish brown. Tegula brown. Wing membrane subhyaline, venation and pterostigma pale amber. Legs brown, medio- and distitarsi reddish brown. Metasomal terga brown, terga and sterna posterior margins translucent yellow.  Pubescence.Dull white. Moderately dense. Head and mesosoma with moderately dense woolly hairs (1– 1.5 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Lower paraocular area and gena with sparse subappressed tomentum, not obscuring surface below. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately dense, fine setae. T1 acarinarial fan complete but sparse dorsally. T2 basolaterally and T3–T5 entirely with moderately dense tomentum partially obscuring surface. T2 apicolateral and T3–T4 apical margins with sparse fringes.  Surface sculpture.Face imbricate, punctation moderately strong. Clypeus with apical half polished, punctation sparse (i=1–3d). Supraclypeal area with punctation moderately sparse (i=1–2d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i=1–1.5d). Upper paraocular area and frons punctate-reticulate. Ocellocular area densely punctate (i≤d). Gena weakly lineolate. Postgena imbricate. Mesoscutum imbricate, punctation moderately fine, moderately dense between parapsidal lines (i=0.5– 1.5d), dense mesad and laterad of parapsidal lines (i≤d), contiguous on anterolateral portions. Mesoscutellum polished, submedial punctation moderately sparse (i=1–2.5d). Axilla punctate. Metanotum imbricate. Preëpisternum rugulose. Hypoepimeral area rugulose. Mesepisternum ruguloso-punctate (i≤d). Metepisternum with dorsal third striate, ventral portion ruguloso-imbricate. Metapostnotum incompletely rugoso-striate, posterior margin imbricate. Propodeum with dorsolateral slope imbricate, lateral surface ruguloso-imbricate, posterior surface imbricate. Metasomal terga polished, punctation moderately dense throughout (i=1–2.5d).  Structure. Head moderately elongate (length/width ratio = 1.00–1.05). Eyes convergent below (UOD/ LOD ratio = 1.16–1.21). Clypeus 2/3 below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/OAD <0.5). Frontal line carinate, ending 2.5 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3–4 teeth. Metapostnotum moderately elongate (MMR ratio = 1.25), posterior margin weakly angled onto posterior surface. Propodeum with oblique carina very weak, lateral carina weak, not reaching dorsal margin.   FIGURE 161.  Lasioglossum occidentale(Crawford). Female (A) lateral habitus; (B) dorsal habitus; (C) face; (D) forewing; (E) metasomal terga. Scale bars, A–C = 1 mm. MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 5.12 mm; head length 1.37 mm; head width 1.32 mm; forewing length 3.17 mm.  Colouration.Flagellum with ventral surface brownish orange-yellow.   FIGURE 162.  Lasioglossum occidentale(Crawford). Male (A) lateral habitus; (B) dorsal habitus; (C) face; D) ventral view of genital capsule; (E) dorsal view of genital capsule; (F) S7, S8. Scale bars, A–C = 1 mm, F = 0.5 mm.  Pubescence. Face below antennal sockets with dense tomentum obscuring surface. Upper paraocular area and frons with tomentum partially obscuring surface. Gena with sparse tomentum not obscuring surface.  Surface sculpture. Clypeal punctation moderately dense (i=1–1.5d). Mesoscutum polished, weakly imbricate, punctation between parapsidal lines moderately sparse (i=1–2d). Metanotum obscurely punctate. Preëpisternum and hypoepimeral area reticulate. Mesepisternum weakly imbricate, distinctly and strongly punctate (i≤d). Propodeum with dorsolateral slope reticulate-punctate, lateral surface rugulose, obscurely punctate, posterior surface strongly punctate (i≤d). Metasomal terga apical impressed areas impunctate.  Structure.Head moderately elongate (length/width ratio = 1.04). Eyes strongly convergent below (UOD/ LOD ratio = 1.52). Antennal sockets distant (IAD/OAD> 1.1). Frontal line carinate, ending 1 OD below median ocellus. Pedicel shorter than F1. F2 length 1.5X F1. F2–F10 moderately short (length/width ratio = 1.33–1.50). Metapostnotum moderately elongate (MMR ratio = 1.10), posterior margin rounded onto posterior surface.   Terminalia.S7 with medial lobe elongate, columnar, apex rounded ( Fig. 162F). S8 with apicomedial margin strongly convex ( Fig. 162F). Genitalia as in Fig. 162D–E. Gonobase with ventral arms connected. Gonostylus moderately large. Retrorse lobe broad and short, weakly attenuated apically.  Range. Albertato Saskatchewan, south to southern New Mexico( Fig. 160).  Additional material examined.   CANADA: ALBERTA: 2♀ Magreth, 16 km S. McIntyre Ranch,  17– 24.vi.1990( D. Griffith); [ PMAE];  MANITOBA: 2♀  10 kmW of Morden, alfalfa field, N49.19587 W098.2503,  410 m,  12.vi.2007( Goulet& Bouldreault);  SASKATCHEWAN: 1♀N of Rocanville, Qu’Appelle R.,  N50.5084 W101.7416,  454 m,  2.vi.2007( Goulet, Boudreault& Fernandez); [ PCYU];   USA: COLORADO: 1♀ Boulder Co., N39°58´29.9 W105°12´15.6´´,  23.vi.2004( Kearns& Oliveras);  5♀ Larimer Co., N40.6833 W105.3975,  11–12.v.2004( S.W. Droege);  MONTANA: 1♀ Pondera Co., Oil Field Rd., N48.10142 W112.05304,  1135 m,  21.vi.2007( Gibbs& Sheffield);  NEW MEXICO: 1♂ Colfax Co., Hwy64, N36.63692 W104.67754,  1932 m,  6.viii.2007( Gibbs& Sheffield);  1♀ Lincoln Co., Ruidoso, N33.3315 W105.59386,  1969 m,  10.viii.2007( Gibbs& Sheffield); [ PCYU].  Floral records. ASTERACEAE:  Taraxacum,  Verbesina exauriculata, GROSSULARIACEAE:  Ribes leptanthum, LINACEAE:  Linum lewisii, RANUNCULACEAE:  Clematis ligusticifolia, ROSACEAE:  Potentilla, SALICACEAE:  Salix.   Comments.Common. Preliminary phylogenetic evidence suggests this is a  Dialictus sensu strictissimo. [199,1174,690,714] NMNH United States of America Examined Las Vegas 219 220 1 1 New Mexico holotype 1902-05-29 ANSP United States of America Las Vegas 219 220 1 1 New Mexico holotype [199,1414,850,873] 1919-07-12 T, NMNH W. Cockerell & Examined. United States of America Gold Hill 219 220 1 1 Colorado holotype 1990-06-17 1990-06-24 1990-06-17 PMAE S. McIntyre Ranch & D. Griffith Canada Magreth 222 223 2 2 Alberta 2007-06-12 Goulet & Bouldreault Canada 410 49.19587 10 km W of Morden 3 -98.2503 222 223 2 2 Manitoba R Canada SASKATCHEWAN 222 223 1 1 Saskatchewan [341,1354,432,458] 2007-06-02 PCYU Goulet & Boudreault & Fernandez Canada 454 50.5084 6 -101.7416 222 223 1 Saskatchewan 2004-06-23 Kearns & Oliveras United States of America Boulder Co. 39.97497 Boulder Co. 1 -105.20433 222 223 1 1 Colorado 2004-05-11 2004-05-12 2004-05-11 S. W. Droege United States of America Larimer Co. 40.6833 Larimer Co. 6 -105.3975 222 223 5 5 Colorado 2007-06-21 Gibbs & Sheffield United States of America Pondera Co. 1135 48.10142 Oil Field Rd. 1 -112.05304 222 223 1 1 Montana 2007-08-06 Gibbs & Sheffield United States of America Colfax Co. 1932 36.63692 Hwy 1 -104.67754 222 223 1 1 New Mexico 2007-08-10 PCYU Gibbs & Sheffield United States of America Lincoln Co. 1969 33.3315 Ruidoso 5 -105.59386 222 223 1 1 New Mexico