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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 mactum is known as the now synonymized Halictus mactus.
Male. —About 5 mm. long; head and thorax dark blue-green; face,
mesothorax, scutellum, and mesopleurae with a brassy tinge; abdomen black; pubescence white. Facial quadrangle little longer than
broad; orbits converging slightly below; face shining, sparsely pubescent; front closely punctured, the punctures more scattered and
shallow below; antennae dark, second and third joints of equal
length; flagellum testaceous beneath; lower half of clypeus shining
black, sparsely punctured. Thorax with short, rather dense pubescence; mesothorax polished, with deep punctures a little more than
the diameter of a puncture apart; punctation of scutellum much like that of the mesothorax, two smooth spots on the disk; metathorax
shining, punctured; disk of propodeum dark blue, long, inclosed posteriorly by a low rim, with very irregular, discontinuous rugae; mesopleurae shining, coarsely punctured; truncation well defined laterally;
tegulae red-testaceous, impunctate. Abdomen narrowly ovate; segments except for a very narrow, polished apical margin, with delicate,
piliferous punctures and short hairs. Wings clear; anterior wing 3.75 mm. long; stigma and nervures pale testaceous; second submarginal cell higher than broad, the first recurrent nervure joining the
second transverso-cubital; third submarginal broad below, contracted
above, little longer than the second on marginal. Legs black; tarsi with yellowish hairs.
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