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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.
In this excerpt, Lasioglossum insolitum is known as the now synonymized Halictus insolitus.
Male.—About 4.5-5 mm. long; head and thorax green; abdomen
black; pubescence white. Facial quadrangle longer than broad;
orbits converging slightly below; front with very close, but shallow
punctures; below the punctures are more sparse; clypeus largely
black, quite closely punctured; antennae dark, third joint hardly
longer than the second; flagellum rufo-testaceous beneath; mandibles
reddish yellow. Thorax with moderately close, short hairs; mesothorax microscopically lineolate, closely and delicately punctured;
punctation of scutellum similar to that of the mesothorax; disk of propodeum subcrescentic, with irregular rugae reaching the apex,
which is sHghtly elevated; tmncation distinct laterally; tegulae very
pale testaceous, impunctate. Abdomen slender, shining, impunctate
apical margins of segments polished, testaceous; bases of segments
clothed with sparse, short hairs. Wings faintly dusky; anterior
wing 3.5 mm. long; stigma and nervures testaceous; second submarginal higher than broad ; first recurrent nervure meeting the second
transverso-cubital ; third submarginal contracted about one-third above, receiving the second recurrent nervure near the apex; twice
as long as the second on marginal. Legs black, shining; knees, tips of tibiae, and tarsi yellow.
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