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Overview |
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 7 mm.; black; pubescence greyish-white, rather thin; length and breadth of head equal; clypeus moderately convex, projecting slightly over one-half below suborbital line; eyes slightly convergent below; cheeks subequal to eyes in width; lateral ocelli subequally distant from eyes and edge of vertex; face above antennae and supraclypeal area dull, minutely and closely punctate; clypeus somewhat shining apically where the punctures are quite coarse and deep, becoming fine but distinct above, area between eyes and ocelli shining but with a few scattered, minute punctures; vertex dull, obscurely punctate; cheeks somewhat shining, minutely and rather closely punctate above, becoming very finely striate below; scutum rather dull, punctures very fine, rather widely separated in central area of disc, becoming very minute and close laterally, punctures of scutellum well separated, scattered, variable in size; pleura very finely rugoso-striate; dorsal area of propodeum finely tessellate in center posteriorly, with short basal striae medially which become complete laterally, posterior face carinate laterally, these carinae nearly reaching dorsal surface; wings hyaline, veins and stigma pale testaceous; tegulae piceous, with a narrow, anterior, hyaline rim; legs entirely dark; hind basitibial plate triangular, apex very narrow and rounded, subacute; abdominal terga somewhat shining, very minutely punctate, punctures scattered and well separated on basal tergum, becoming closer and more obscure on the more apical terga, lacking distinct, basal fasciae, the discal pubescence short and thin but quite uniform, largely pale.
MALE�Length 7 mm.; black, including entire clypeus and legs; pubescence greyish-white, rather thin; head considerably broader than long; clypeus very broad and rather fiat, projecting about one-half below suborbital line; eyes subparallel; mandibles simple, elongate, but tip of one not nearly attaining base of the other when closed; labrum triangular, acute medially; cheeks subequal to eyes in width; lateral ocelli very slightly nearer margin of vertex than to eyes; basal segment of flagellum somewhat longer than pedicel, second and following segments shorter, considerably broader than long, brownish below, more piceous above; face above antennae and supraclypeal area dull, punctures very fine and close, rather obscure; clypeus more shining, rather closely and finely punctate above, becoming more coarsely so below, face on each side of clypeus and area between eyes and ocelli shining, with very minute, widely scattered punctures; vertex medially more or less shining, punctures obscure; cheeks moderately shining, with minute, obscure and rather fine punctures above, becoming very finely striate below; scutum rather dull, punctures very fine, well separated in median area, becoming quite close laterally, those on scutellum scattered and variable in size; pleura very finely rugoso-striate; dorsal area of propodeum finely and closely striate laterally, incompletely so medially, posterior portion of this area obscurely sculptured, posterior face margined laterally with fine carinae which are relatively short; wings hyaline, veins and stigma testaceous; tegulae piceous, very narrowly hyaline anteriorly; legs dark, but apical tarsal segments more or less reddened; abdominal terga somewhat shining, punctures exceedingly minute, rather close, especially on the more apical segments, basal fasciae not evident; apical margin of sternum 5 nearly straight, sternum 6 broadly rounded; gonostyli composed of an apically directed, finger-like lobe which is fringed on the inner surface with short hairs, and a more elongate, slender, membraneous lobe which is directed basally.
DISTRIBUTION�Indiana and Michigan to Virginia, south to Texas, Mississippi and Florida; April to September.
FLOWER RECORDS�This is primarily an oligolege of Pyrrhopappus carolinianus, but will occasionally visit other flowers, as shown by the following records: 1 female, Raleigh, N. C., June 17, 1922 (C. S. Brimley, on Cucurbita,); 1 male, Wasington, D. C., July 29, (N. Banks, on Chicory). The host plant of this male presumably is Cichorium intybus L., or Common Chicory. There is one other record of collection, on Taraxacum palustre vulgare in Indiana, but that specimen is not now at hand. A considerable series of males and females has been collected in North Carolina on Pyrrhopappus.
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Identification | |
Note that this species sometimes has 3 rather than 2 submarginal cells.
Extracted from: Gibbs, J., Packer, L., Dumesh, S. and Danforth, B. N. 2013. Revision and reclassification of Lasioglossum (Evylaeus), L. (Hemihalictus) and L. (Sphecodogastra) in eastern North America (Hymenoptera: Apoidea: Halicidae). Zootaxa 3672 (1). Pp 1-116.
Diagnosis. Both sexes of Lasioglossum lustrans can usually be recognised by the absence of vein 1rs-m, resulting
in only two submarginal cells (Fig. 1B). A small proportion of individuals have vein 1rs-m present in both wings.
Females of L. lustrans can also be recognised by the combination of mesosoma finely sculptured; pronotum
rounded dorsolaterally; inner metatibial spur denticulate, teeth shorter than width of rachis (Fig 5E); and T1
anterior surface with appressed and erect hairs intermixed (Fig. 82A). Lasioglossum fedorense and L. swenki are
similar, but both have pectinate inner metatibial spurs (Figs. 5B, 5J), three submarginal cells (Fig. 1A), and
pronotum sharply angled dorsolaterally.
Males of L. lustrans can be recognised by the combination of clypeus black (Fig. 6E); mandible elongate,
extending to opposing mandible base (Fig. 6E); antennal flagellomeres short, length approximately equal to width,
except F11 longer than wide; F2 shorter than or subequal to F1; and pronotum with dorsolateral carina anterior to
oblique sulcus.
Redescription. FEMALE. Length 5.9–6.9 mm. Head length 1.82–2.03 mm. Head width 1.85–2.08 mm. Wing
length 4.5–5.3 mm. (n=5)
Colour. Head and mesosoma black. Antenna black, except ventral surface of flagellum reddish brown. Tegula
dark brown. Legs dark brown, except medio- and distitarsi reddish brown. Wing membrane hyaline. Pterostigma
pale testaceous. Metasomal terga dark brown, except apical margins testaceous.
Structure. Head wide (L/W ratio = 0.92–0.99). Clypeus 3/4 below suborbital line. Eyes convergent below
(UOD:LOD = 1.17–1.21). Gena width subequal to eye. Ocelli normal. Pronotal ridge smoothly rounded. Vein 1rsm usually absent. Protibial spur with apical serrations subequal in length to width of malus. Inner metatibial spur
serrate, teeth 6–7, basal teeth shorter than width of rachis. Metapostnotum posterior margin angled onto posterior
propodeal surface. Propodeal lateral carina not reaching dorsal margin, oblique carina absent or very obscure.
Surface sculpture. Supraclypeal area imbricate; punctures fine, shallow, dense (i=1–1.5d). Frons finely
reticulate. Gena lineolate, postgena imbricate. Mesoscutum weakly imbricate, punctures fine, dense laterally (i=1–
1.5d), well-separated between parapsidal lines (i=1–4d). Mesepisternum relatively smooth, polished, punctate.
Metapostnotum carinulate-rugulose, apical margin imbricate. Propodeum rugulose-imbricate. Metasomal terga
polished, apical impressed areas weakly coriarious; punctures dense throughout, except T1 apical impressed area
impunctate.
Pubescence. Head and mesosoma with sparse plumose hairs. Metafemoral scopa with dense plumose hairs.
Propodeum with erect plumose and simple hairs. Metasomal terga with moderately dense apical fimbriae,
continuous on T3–T4. T1 with intermixed appressed and erect hairs. Metasomal sterna with densely plumose
scopa.
MALE. Length 5.0–5.9 mm. Head length 1.35–1.50 mm. Head width 1.40–1.55 mm. Wing length 4.5–5.0
mm. (n=3)
Colour. Head and mesosoma black. Antenna black, except ventral surface of flagellum reddish brown. Legs
dark brown, except medio- and distitarsi reddish brown. Wing membrane hyaline. Pterostigma pale testaceous.
Metasomal terga black brown, except apical margins reddish brown.
Structure. Head wide (L/W ratio = 0.93–0.97). Eyes weakly convergent below (UOD:LOD = 1.02–1.20).
Mandible long, reaching beyond opposing clypeal angle. Flagellomeres short, F2 subequal to F1, much shorter
than scape. Gena width subequal to eye. Pronotal ridge rounded above, sharply angled anterior to sulcus, acute
angle visible when viewed dorsally. Propodeal lateral carina nearly reaching dorsal margin.
Surface sculpture. Supraclypeal area imbricate; punctures fine, shallow, dense (i=1–1.5d). Ocellocular area
polished, distinctly punctate. Gena and postgena weakly lineolate. Mesoscutum polished, weakly imbricate in part ; punctures fine, dense laterally (i=1–1.5d), clearly separated between parapsidal lines (i=1–4d). Mesepisternum
smooth, weakly lineolate transversely; punctures fine, distinct below scrobe. Metapostnotum carinulate-rugulose.
Propodeum weakly imbricate. Metasomal terga polished, apical impressed areas coriarious; punctures close
throughout.
Pubescence. Head and mesosoma with sparse plumose hairs. Paraocular area without evident tomentum.
Propodeum largely bare, with scattered plumose hairs. Metasomal terga with apical fimbriae sparse; T1 with
sparse, subappressed, anterior fan. Metasomal sterna with sparse, plumose hairs (1.5–2 OD); apical margins with
moderately dense fimbriae.
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Updated: 2024-04-19 20:18:28 gmt
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