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© Copyright source/photographer
· 5
Lasioglossum albohirtum, F, Back, WY, Lincoln County |
© Copyright source/photographer
· 5
Lasioglossum albohirtum, F, Face, WY, Lincoln County |
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© Copyright source/photographer
· 5
Lasioglossum albohirtum, F, Side, WY, Lincoln County |
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Overview |
Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 61-65
Halictus albohirtus Crawford, 1907: 193. ♀.
Holotype. ♀ USA, Nevada, Ormsby Co, July (Baker); [NMNH: (1)2068]. Examined.
Halictus pilosellus Cockerell, 1936: 160. ♀. [new synonymy]
Holotype. ♀ California, Garberville, Humboldt Co., 19.iv.1935 on Cercocarpus, (T.D.A. Cockerell); [CAS: 4276].
Examined.
Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) albohirtum, p. 1111, L. (C.) pilosellum, p. 1116
(catalogue); Hurd, 1979: Dialictus albohirtus, p. 1964, D. pilosellus, p. 1970 (catalogue); Moure & Hurd,
1987: Dialictus albohirtus, p. 89, D. pilosellus, p. 123 (catalogue).
Diagnosis. Females of L. albohirtum are recognisable by the diagnostic combination of very abundant
white pubescence which obscures large parts of head, mesosoma and metasomal terga, round head (length/
width ratio = 0.96�1.00), metallic golden colouration of head and mesosoma and metallic green colouration of
metasomal terga, hyaline wings with very pale venation, and distinct mesepisternal punctures. They are similar
to L. hyalinum which has a bluish green head and mesosoma and a brown metasoma. Two undescribed species
in the Western USA are the most similar to L. albohirtum. One of these has a yellowish brown clypeus
and even more abundant pubescence. The other undescribed species is less pubescent and has the mesoscutum
more imbricate.
Males of L. albohirtum are similar to females but have more elongate heads (length/width ratio = 1.00�
1.03) and may be further distinguished by the more abundant facial pubescence, moderately elongate
flagellomeres (length/width ratio = 1.42�1.70) with bright yellow ventral surfaces, and yellow tarsi. Male L.
hyalinum are most similar but have brown metasomal terga.
Redescription. FEMALE. Length 5.37�6.83 mm; head length 1.56�1.73 mm; head width 1.61�1.78 mm;
forewing length 3.97�4.45 mm.
Colouration. Head and mesosoma golden green. Labrum reddish brown. Mandible orange. Clypeus with
apical half blackish brown, basal half and supraclypeal area brassy. Antenna dark brown, flagellum with ventral
surface orange-yellow. Mesoscutum with brassy reflections. Tegula pale, translucent amber. Wing membrane
hyaline, venation and pterostigma pale brownish yellow. Legs brown, tibial bases and apices, and tarsi
yellow-amber, meso- and metatarsi suffused with brown. Metasomal terga green, apical impressed areas pale
translucent brownish yellow, often with darker, subapical, amber transverse stripe, sterna brown.
Pubescence. White. Extremely abundant. Head and mesosoma with dense woolly hairs (1�2 OD), longest
on genal beard, metanotum and mesopleuron (2�2.5 OD). Paraocular area, gena, pronotum dorsolateral angle
and lobe, lateral margins of mesoscutum, metanotum, metepisternum, and propodeum with lateral surface
obscured by tomentum. Propodeum with dense plumose hairs on lateral and posterior surfaces (2�2.5 OD).
Metasoma with dense, fine setae. T1 acarinarial fan wide and complete. T1 antero- and dorsolateral areas, T2
basal and lateral portions, and T3�T5 with dense tomentum. T3�T4 apical margins with sparse fringes.
Surface sculpture. Face polished, punctation fine and deep. Clypeal punctation moderately sparse (i=1�
3d). Supraclypeal area with punctation moderately sparse (i=1�2d). Lower paraocular and antennocular areas
with punctation dense (i≤d). Upper paraocular area and frons punctate-reticulate. Ocellocular area minutely
punctate (i=d). Gena and postgena polished. Mesoscutum polished, punctation fine and deep, evenly spaced
(i=1�2d), dense on anterolateral portion (i≤d). Mesoscutellum similar to mesoscutum with additional minute
punctures, submedial punctation moderately sparse (i=1�2d). Axilla punctate. Metanotum weakly imbricate,
obscurely punctate. Pre�pisternum reticulate-punctate. Hypoepimeral area punctate (i≤d). Mesepisternum polished,
punctation irregular (i≤d), more widely spaced on ventrally reflexed portion. Metepisternum with dorsal
third ruguloso-striate and ventral portion imbricate. Metapostnotum anastomosingly rugoso-striate,
posterior margin polished. Propodeum with dorsolateral slope and posterior surface ruguloso-imbricate, lateral
surface tessellate-imbricate. Metasomal terga polished, punctation dense throughout (i=1�2d).
Structure. Head wide to round (length/width ratio = 0.96�1.00). Eyes weakly convergent below (UOD/
LOD ratio = 1.09�1.13). Clypeus 2/3�3/4 below suborbital tangent, apicolateral margins convergent. Antennal
sockets close (IAD/OAD = 0.5). Frontal line carinate, ending 2 OD below median ocellus. Gena nearly as
wide as eye. Inner metatibial spur pectinate with 3�4 teeth. Metapostnotum moderately elongate (MMR ratio
= 1.15�1.38), posterior margin rounded onto posterior surface. Propodeum with oblique carina virtually
absent, lateral carina weak, reaching halfway to dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 5.06�
5.19 mm; head length 1.39�1.49 mm; head width 1.38�1.45 mm; forewing length 3.60�3.72 mm.
Colouration. Mandible yellow, apex red, base blackish brown. Flagellum with ventral surface yellow.
Tibial bases and apices, and tarsi yellow.
Pubescence. Face below eye emargination dense obscuring surface, less abundant on lower clypeus. S2�
S3 and S4 lateral portions with moderately dense erect hairs (1.5�2 OD).
Surface sculpture. Propodeum with dorsolateral slope and posterior surface strongly punctate (i≤d), lateral
surface ruguloso-reticulate. Metasomal terga apical impressed areas virtually impunctate.
Structure. Head round to moderately elongate (length/width ratio = 1.00�1.03). Eyes weakly convergent
below (UOD/LOD ratio = 1.36�1.37). Clypeus 1/2�2/3 below suborbital tangent, apicolateral margins convergent.
Antennal sockets close (IAD/OAD > 1.1). Frontal line carinate, ending 2 OD below median ocellus.
Pedicel shorter than F1. F2 length 1.7�1.9X F1. F2�F10 moderately elongate (length/width ratio = 1.42�1.70).
Metapostnotum elongate (MMR ratio = 1.13�1.19), posterior margin rounded onto posterior surface. Propodeum
with oblique carina virtually absent, lateral carina short, not reaching dorsal margin.
Terminalia. S7 with median lobe clavate, apex rounded (Fig. 69F). S8 with apicomedial margin weakly
convex (Fig. 69F). Genitalia as in Fig. 69D�E. Gonobase with ventral arms widely separated. Gonostylus
moderately large. Retrorse lobes narrow, weakly attenuated apically. Penis valve narrow.
Range. Saskatchewan to British Columbia, south to Nevada and California
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Identification | |
Extracted from: Halictus pilosellus Cockerell 1936 Pan-Pac. Ent. 12 pg.160 - 161
Female-Length about 6 mm.. anterior wing 4; robust, shining yellowish-green. including abdomen; mandibles and labrum dark red; apical part of Aogellum light ferruginous beneath; tegulare pellucid testaceous, not punctured; wings clear hyaline, stigma and nervures very pale; legs black. hind knees. tibiae at extreme apex and base of basitarsi, red; a copper-red brush at end of hind basitarsi; hind spur with four long blunt spines and a fifth rudimentary; hind margins of second and following tergite pallid; tergites 3 to 5 entirely covered with dull white tomentum, first and second with such tomentum at sides and second also at base, but much narrowed in middle, the exposed parts of these tergites brilliantly polished. Face of moderate width; clypeus projecting, shining, but the apical margin broadly black; supraclypeal area highly polished; front entirely dull; hair of head and thorax above short, faintly yellowish: mesothorax shining, polished on disc, median groove distinct; scutellum shining; area of metathorax crescentic, rather short, appearing rugose under a lens. with a thick shining posterior margin, the microscope showing about eighteen fine wrinkled rugae with a little smooth space at middle of base; the first recurrent nervure meets the second intercubitus.
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Updated: 2024-04-26 04:06:13 gmt
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