Identification Summary:Large; white to very pale yellow wing veins; hairs on wing usually bright white; complete fan on T1; somewhat like L. cressonii but dark blue thorax and scutal punctures less dense; rim of propodeal triangle can at times be partially carinate but usualy tends to not be.
Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
FEMALE—Length 6 mm.; head and thorax olive green, abdominal terga more piceous, with hyaline apical margins; pubescence short, thin, entirely white, apical segments of abdomen dimly pale tomentose; head slightly broader than long; clypeus broadly convex, projecting somewhat more than one-half below suborbital line; supraclypeal area nearly as long as broad and only slightly shorter than clypeus; eyes convergent below; lateral ocelli slightly nearer eyes than each other; cheeks subequal to eyes in width; face below ocelli somewhat shining between the coarse, deep, distinct punctures, these distinctly but not widely separated medially, becoming somewhat finer and more widely separated at extreme sides, and becoming minute and obscure oii the vertex laterally; cheeks above shining, minutely and rather sparsely punctate, becoming finely but distinctly striate below; hypostomal carinae parallel, apical angle rather narrowly rounded; lower half of face somewhat shining, punctures deep, distinct and rather coarse, well separated between antennae and eyes, but becoming somewhat closer below, those on supraclypeal area somewhat finer, quite close except near midline, those along upper margin of clypeus rather fine and quite close, otherwise the punctures rather coarse, deep and well separated, entire surface except the narrow upper margin blackened; scutum and scutellum somewhat shining, punctures rather sparse over most of scutum, being close only at extreme sides (much as in nymphaearum, fig. 99); scutellum finely and sparsely punctate except in midline where the punctures are close; pleura rather coarsely rugose above, becoming rather finely rugoso-striate posteriorly; dorsal area of propodeum rather coarsely striate laterally, becoming more irregularly and finely rugoso-striate medially, posterior face almost completely encircled by a salient rim, surface rather finely reticulate, lateral faces rather finely rugoso-striate; wings whitish, veins and stigma pale yellow; tegulae testaceous-hyaline; legs brownish-piceous basally, becoming somewhat paler apically; abdominal terga 1 and 2 shining, punctures very minute, and rather irregularly scattered on 1, somewhat more regular and close across basal half of 2, but these very minute, apical margin rather broadly but shallowly impressed and becoming narrowly whitish-hyaline along rims, terga 2 rather thinly tomentose at extreme sides, 3 and 4 quite densely pale tomentose, apical margins rather broadly whitish hyaline.
MALE—Length 5.5 mm.; head and thorax metallic green, abdomen piceous, terga whitish-hyaline apically; pubescence rather short and thin, entirely pale, rather dense on face, quite copious on thorax laterally; length and breadth of head subequal; clypeus quite narrow and protuberant, projecting about two- thirds below suborbital line; supraclypeal area subequal to clypeus in length; eyes strongly convergent below; lateral ocelli subequally distant from eyes and each other; basal segment of flagellum slightly longer than pedicel, about as broad as long, following segments somewhat longer but not nearly twice as long as broad, pale brownish-testaceous below, becoming dark brownish to piceous above; cheeks slightly narrower than eyes; face below ocelli somewhat shining beneath the rather dense pubescence, punctures rather deep and distinct but fine and close, becoming more irregular and widely separated on vertex laterally; cheeks above shining, punctures fine and indistinct, becoming smooth and shining beneath; hypostomal carinae subparallel, apical angles quite abrupt; lower half of face very finely and quite closely punctate beneath the dense tomentum; scutum and scutellum shining, punctures deep and distinct but rather fine, quite sparse, becoming somewhat closer anteriorly and at extreme sides; pleura rather finely rugoso-punctate, becoming relatively smooth posteriorly; dorsal area of propodeum coarsely striate laterally, the striae becoming indefinite medially except for a single complete median striae, posterior face only partially encircled by a salient rim, but the upper face sharply delimited from it, surface rather shallowly but coarsely reticulate, lateral faces irregularly roughened or substriate; wings whitish, veins and stigma pale yellow; tegulae testaceous-hyaline; legs piceous basally, tibiae more or less testaceous at base and apex, tarsi testaceous; abdominal terga shining, punctures quite distinct but very fine, evenly distributed, apical margins narrowly whitish-hyaline, becoming more broadly so on terga 4 and 5; apical margin of sternum 5 straight; median lobe of sternum 7 broadly expanded and abruptly truncate apically; gonostylus of armature as shown (fig. 102), retrorse lobe expansive, slightly broadened apically, finely short pubescent.
DISTRIBUTION—Minnesota to Nova Scotia, south to North Carolina; May to September.
FLOWER RECORDS—Apocynum, Barbarea, Chrysanthemum, Cucurbita, Potentilla, Rubus, Salvia, Solidago and Tarazacurit. Robertson (1929) records albipennis on Asclepias, Comandra, Erigeron, Houstonia, Krigia, Lepachys, Melilotus, Oenothera, Oxalis, Petalostemum, Radicula, Rudbeckia and Zizia.
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa
Lasioglossum (Dialictus) albipenne (Robertson)
Halictus albipennis Robertson, 1890: 317. ♀ ♂.
Lectotype. ♀ USA, Illinois, [Carlinville] (C. Robertson); [ANSP: 4251] designated herein. Examined.
Halictus nubilis Lovell, 1905a: 40. ♀.
Lectotype. ♀ USA, Maine, Waldoboro, 2.viii. (J.H. Lovell); [NMNH: 71570] designated herein. Examined.
Halictus (Chloralictus) lactineus Sandhouse, 1924: 34. ♀.
Holotype. ♀ USA, Colorado, Boulder, 4.viii.1908 (S.A. Rohwer); [NMNH: 26435]. Examined.
Halictus (Chloralictus) basilicus Sandhouse, 1924: 36. ♂.
Holotype. ♂ USA, Connecticut, Colebrook, 1–7.ix., (W.M. Wheeler); [NMNH: 26439]. Examined.
Taxonomy. Robertson, 1902b: Chloralictus albipennis, p. 249 (key); Viereck, 1916: Halictus (Chloralictus) albipennis,
p. 707 (key); Michener, 1951: Lasioglossum (Chloralictus) albipenne, p. 1111, L. (C.) basilicum, p. 1112, L. (C.)
lactineum, p. 1114 (catalogue); Mitchell, 1960: Dialictus albipennis ♀♂, p. 378, D. basilicus ♂, 383 (redescription);
Knerer and Atwood, 1966a: Dialictus basilicus ♀, p. 881 (description); Krombein, 1967: Lasioglossum (Dialictus) albipenne,
p. 462, L. (D.) basilicum, p. 462 (catalogue); Hurd, 1979: Dialictus albipennis, p. 1963, D. basilicus, p. 1964, D.
lactineus, p. 1967 (catalogue); Moure & Hurd, 1987: Dialictus albipennis, p. 88, D. basilicus, p. 92, D. lactineus, p. 109
(catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) albipenne ♀♂, p. 57 (redescription, key, synonymies).
Diagnosis. Female L. albipenne can be recognised by the following diagnostic combination: head and mesosoma
bluish; wings white, pterostigma and venation pale yellow; hypostomal carinae parallel, unreflexed; mesoscutal punctures
coarse, sparse between parapsidal lines (i=1–3d); mesepisternum coarsely reticulate-rugose; propodeum strongly
carinate; T1 acarinarial fan large without dorsal opening; and metasomal terga brown with dense tomentum, distinctly
punctures throughout. They are most similar to L. cressonii, L. disparile, and L. nymphaearum. Female L. cressonii have
the head and mesosoma golden green, mesoscutal punctures relatively dense (i=1–1.5d) and wings faintly dusky. Female
L. disparile have a distinct glabrate band on the declivitous surface of T1 separating the acarinarial fan from a dorsal hair
band. Female L. nymphaearum have hypostomal carina reflexed distally and propodeal dorsal and posterior surfaces separated
by uninterrupted transverse carina.
Male L. albipenne are similar to females except for the following: head elongate (length/width ratio = 0.99–1.08);
face obscured by abundant white hairs; flagellomeres short (length/width ratio = 1.21–1.31), bright yellow ventrally; and
mesepisternum punctate-reticulate. They are most similar to L. pruinosum and L. nymphaearum. Male L. pruinosum have
the clypeus with distal yellow maculation. Male L. nymphaearum have tegula distinctly punctate.
Range. Nova Scotia west to British Columbia, south to North Carolina, Colorado and Oregon. USA: CO, CT, IL,
IA, KS, MA, ME, MI, MN, ND, NE, NH, NJ, NY, SD, TN, VT, WI, WV. CANADA: AB, BC, MB, NB, NS, ON, PE,
DNA Barcode. Available. Multiple sequences.
Variation in the strength of the female propodeal carinae can be seen in long series. Individuals with weaker carinae
have been treated as separate species (Knerer & Atwood 1966a).
The specimen of Halictus albipennis indicated above is designated herein as the lectotype to ensure future stability in
the application of the name. Some of Robertson’s syntype series include more than one species, which could potentially
lead to taxonomic confusion. An invalid lectotype led Gibbs (2010b) to treat the name Halictus nymphaearum as a junior
subjective synonymy of L. albipenne (for discussion see Gibbs 2010b, below). Other subjective synonymies have also
recently been made (Gibbs 2010b). The specimen of Halictus nubilis indicated above is designated herein as the lectotype
to ensure future stability in the application of the name.