The genus Stelis comprises a colorful group of parasitic
Anthidiine bees that are seldom encountered or collected at
floral resources. Adult females spend most of their time
searching for hosts or waiting near host nests until they are
available for parasitism. Like their parasites, all hosts are in
the family Megachilidae. Herein, we discuss 65 North American
species in this Holarctic genus, including 33 new species, and
phylogenetically analyze the group with respect to morphological
characters, host, and host nest characteristics. Species 1:
Hymenoptera Megachilidae Stelis Keywords: parasites, Anthidiine
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Annual Meeting and Exhibition