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 merosum is known as the now synonymized Halictus merosus.
Male. —About 5 mm. long; head and thorax dark blue; abdomen
dark brown ; pubescence white. Facial quadrangle longer than broad
orbits converging sharply below; face quite densely pubescent; front
with close, but shallow punctures; the punctures are more sparse
below; second and third joints of equal length; flagellum dark
testaceous; yellow-testaceous beneath; mandibles reddish. Thorax
sparsely pubescent; mesothorax polished, with sparse, delicate punctures; scutellum delicately punctured, with two large, polished spots on the disk; disk of propodeum very dark blue,subcrescentic, shining,
with a few irregular plicae reaching the apical margin; pleurae very
rough; truncation distinct laterally; tegulae pale, impunctate. Abdomen ovate, shining; apical margins polished, testaceous; bases of
segments sparsely pubescent. Wings yellowish; anterior wing 3.25
mm. long; stigma and nervures testaceous; second submarginal cell higher than broad, contracted about one-half above, receiving the.
first recurrent nervure near the apex; third submarginal higher than
broad, contracted above, more than twice as long as second on marginal. Legs dark brown, with dull white hairs; knees, tips of tibiae,
and tarsi yellow.
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