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Extracted from: Sandhouse G. A. New North American Species of Bees Belonging to the Genus Halictus (Chloralictus). No. 2532 – Proceedings U.S. National Museum. Vol. 65, Art. 19.
Lasioglossum Impavidum appears in this excerpt as the now synonymized Halictus Impavidus.
Female.—About 5.5-6 mm. long; head and thorax olive green;
abdomen black; pubescence white. Facial quadrangle longer than
broad; orbits converging below; face covered with rather abundant
white hairs; front with close but shallow punctures, the punctures more scattered on the sides of the face; supraclypeal area and upper
half of clypeus with a few deep punctures; lower half of clypeus black,
with very few coarse punctures, fringed with yellowish hairs ; antennae
dark brown, the flagellum dark ferruginous beneath. Mesothorax
brassy green, shining, quite closely punctured; scutellum shining, the
disk entirely covered with delicate punctures; disk of propodeum
without an inclosing rim, the median portion with irregularly anastomosing rugae, the sides of the disk plicate: mesopleurae with coarse shallow punctures; truncation well defined laterally; tegulae very pale
testaceous, impunctate. Abdomen obovate, impunctate; apical margins of segments testaceous; segments 1-2 sparsely pubescent; segments 3-5, with more abundant white hairs. Wings clear; anterior
wing 4.25 mm. long; stigma and nervures pale testaceous; second
submarginal cell broader at the base than it is high, but contracted
above, receiving the first recurrent nervure very near the apex; third
submarginal gently contracted above, about one and one-half times as long as second on the marginal. Legs dark with yellowish-white
pubescence; knees and tarsi reddened; hind spur pectinate with
three moderately long teeth.
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