PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM by (he SMITHSONIAN INSTITUTION U. S. NATIONAL MUSEUM Y ], 93 Washington: 1943 No. 3157 THE NEARCTIC 1 SPECIES OF PARASITIC FLIES BELONGING TO ZENILLIA AND ALLIED GENERA By Wendell F. Sellers This paper is a revision of the known species of parasitic two-winged flies belonging to the genera Zenillia, Phryxe, Carcelia, Aplomya, Sis-yropa, Thelymyia, and a new genus (p. 107) (Diptera : Larvaevoridae). It includes also some Palearctic species of the genera Zenillia, Phryxe, Carcelia, and Aplomya and some Neotropical species of the genera Zenillia, Carcelia, and a second new genus (p. 106). In 1897 Coquillett 2 placed the species belonging to this group of genera in Exorista Meigen, 1803. However, Coquillett 3 pointed out in 1910 that Exorista is monobasic, with Musca larvarutn Linnaeus as the type, a species that is not congeneric with those referred to Exorista by Coquillett in 1897 and subsequently by other outhors. In 1924 Aldrich and Webber 4 selected Zenillia Robineau-Desvoidy, 1830, to replace Exorista of authors, not Meigen. More recently Townsend 5 has expressed the opinion that the treatment proposed by Aldrich and Webber combines several widely distinct elements under one generic name. By contrast Townsend has recognized 17 different generic segregates in this complex. It does, nevertheless, seem advisable to divide the species groups into several distinguishable units and to ac-1 Some Palearctic and Neotropical species are also included. 2 Revision of the Tachinidae of America North of Mexico, U. S. Dept. Agr., Div. Ent, Tech. Bull. 7, 1897. 3 The type-species of the North American genera of Diptera. Proc. U. S. Nat. Mus., vol. 37, pp. 499-647, 1910. ^ The North American species of parasitic two-winged flies belonging to the genus Phorocera and allied genera. Proc. U. S. Nat. Mus., vol. 63, art. 17, 90 pp., 1924. 5 Townsend, Manual of myiology, pt. 4, p. 212, 1936. 1
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