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. 



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