DIAGNOSES OF NEW GENERA OF MUSCOID FLIES 

 FOUNDED ON OLD SPECIES. 



By Charles H. T. Townsend, 



Custodian of Muscoid Diptera, United States National Museum 



During the past year, the work of establishing necessary genera for 

 the reception of abeady-erected species, contained in the muscoid 

 collections of the United States National Museum, has been prose- 

 cuted by the writer. A first set of these new genera, hitherto 

 entirely overlooked by students of the superfamily, or not recognized 

 as of generic rank, and thus ignored, was recently published.^ The 

 present paper is in continuation of this work. 



Numbei-s preceded by the letters TD refer to the Townsend- 

 Dissection series.^ 



The abbreviation ''Rev. Tach." is used for Mr. Coquillett's best- 

 known work on this group.^ 



Family HYPODERMATIDAE. 

 ATELECEPHALA, new genus. 



Genotype. — Hypoderma diana Brauer, Verh. Zool.-Bot. Ges. Wien, 

 vol. 8, 1858, pp. 397, 407-478, 455, fig. 5, pis. 10 and 11; Monogr. 

 Oestr., 1863, p. 113. 



Differs from Hypoderma as foUows : Form in general more narrowed. 

 Front of male at vertex only two-thirds as wide as eye. Carina of 

 second antemial joint completely covering the third joint, arista 

 practically apical. Clypeal swelling very convex, clypeal beard 

 very thin. ScuteUum heavily tuberculate on margin. Abdomen of 

 male laterally compressed apicaUy, male genitaUa of a distinct type. 



The Hypoderma group is abundantly entitled to family rank. It 

 seems in some measure allied with the cypseloid (borboroid) stock, as 

 indicated by the auxiliary vein being much approximated to the 

 first vein; and especially by the facial plate being greatly widened 

 and swollen below, the facialia having become vestigial. The facial 

 speciaHzation consists in an extraordinary inflation of the clypeus 



» Proposal of new muscoid genera for old species, Proc. Biol. Soc. Wash., vol. 28, 1915, pp. 1&-23. 



* Explained in Proc. U. S. Nat. Mus., vol. 43, p. 301. 



• Revision of the Tachinidae of America north of Mexico, Technical Series, No. 7, U. S. Department of 

 Agriculture, Division of Entomology, Washington, 1897. 



Proceedings U. S. National Museum, Vol. 49— No. 2128. 



617 



