The larva, adult female, and adult male of Chrysomelobia labidomerae n. sp. are described. The adult female is compared with that of the only other described species in the genus, C. mahunkai from Europe. Chrysomelobia labidomerae is a parasite of adult milkweed leaf beetles, Labidomera clivicollis (Coleoptera: Chrysomelidae), in North America. Morphological similarities of all stages of Chrysomelobia with those of the generalized podapolipid Dorsipes support the retention of Chrysomelobia in the Podapolipidae as a most primitive genus in that family and the only one with 4 pairs of legs in the adult female.