PROC. ENTOMOL. SOC. WASH. 83(2). 1981, pp. 222-224 A NEW SPECIES OF ENDAPHIS (DIPTERA: CECIDOMYIIDAE) ENDOPARASITIC IN APHIDS IN BRITISH COLUMBIA Raymond J. Gagne Systematic Entomology Laboratory, IIBIIL Agric. Res., Sci. and Educ. Admin., USDA, ''A U.S. National Museum of Natural History, Washington, D.C. 20560. Abstract. — Endaphis gregaria, new species, is described, illustrated, and compared to its nearest relatives. Its larvae are gregarious endoparasites of aphids on red alder in British Columbia. Although endoparasitic cecido-myiids are widely distributed, E. gregaria is the first species recorded from North America. A new species of Endaphis is described to provide a name for the first endoparasitic cecidomyiid of aphids recorded from North America. Mack-auer and Foottit (1979) reported on the bionomics of this species (as En-daphis sp.) on Euceraphis gillettei (Davidson) (Homoptera: Aphididae) on red alder, Alnus rubra Bong., in British Columbia. The genus Endaphis is otherwise known from one European species, Endaphis perfida Kieffer, but the genus is similar in many respects to En-dopsylla, Pseudendaphis, and Occuloxeniuni, which together include five species that are endoparasitic in aphids, tingids, or psyllids in Europe, Ghana, and Trinidad. Endaphis species are separated from those of the other three genera by the bifilar flagellomeres of the male antennae and the more simplified larvae with diminutive spiracles, reduced papillae, and cone-shaped caudal extensions. Mackauer and Foottit (1979) summarized the scant biological information available on the related species. 1 am grateful to M. Mackauer, Simon Eraser University, Burnaby, B.C., for submitting the specimens to me for description and to K. M. Harris, Commonwealth Institute of Entomology, London, for reviewing the manu-script. Endaphis gregaria Gagne, New Species Adult. — Eyes 7-8 facets long across vertex; eye facets circular, slightly less close together on lateral parts of eyes than elsewhere. Occipital peak very short, but the 2 associated large setal bases evident. Flagellomeres of
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