June, I9I3-] TOWNSEND : TrICHIOPODA LaTREILLE. 147 



ON TRICHIOPODA LATREILLE, POLISTOMYIA 



TOWNSEND AND TRICHOPODOPSIS 



NEW GENUS. 



By Charles H. T. Townsend, 

 Lima, Peru. 



In 1829 Latreille founded the genus Trichiopoda, including therein 

 the two species Thercva plumipcs Fab. and T. lanipcs Fab. In 1910 

 Coquillett designated the first of these as the type of the genus. Since 

 Musca (Dictya) pcnnipcs Fab. was not included by Latreille in his 

 genus Trichiopoda, the writer's designation of that species in 1908 as 

 the type of the genus can not hold. 



In 1908 the writer founded the genus PoUstomyia for Trichopoda 

 trifasciata Lw. It is now quite certain that the last-named species is 

 congeneric with Trichiopoda plumipcs Fab. In consequence of this 

 fact the genus PoUstomyia becomes a synonym of Trichiopoda. The 

 yellowish or rust-colored humeri, scutellum and femora of plumipcs 

 indicate the PoUstomyia group quite unmistakably. Not only the 

 scutellum and femora ferruginous, but the inner border of wing 

 broadly hyaline and the cylindrical abdomen of the description all 

 indicate PoUstomyia, the only character not typical so far as the 

 description goes being the apparent absence of yellowish on wing, but 

 this may easily be exceptional and is therefore immaterial. The 

 cylindrical and black abdomen with broad hyaline inner margin of 

 wing might indicate Entrichopoda, but the yellow scutellum and 

 femora preclude this reference.- Moreover the description implies 

 a broader hyaline inner border to the wing than that of Entricho- 

 poda, the hyaline being evidently as broad as the black if not some- 

 what broader. All this points to the correctness of Coquillett's 

 determination of the form as allied with trifasciata, in which opinion 

 the writer concurred in 1908 (Tax. Muse. Flies, p. 134). 



Coquillett's designation of this species as the type of Trichiopoda 

 wholly changes the sense of the latter name and drops the name 

 PoUstomyia and its derivatives. Furthermore this designation leaves 

 the group of which pcnnipcs is typical without a nearer generic ref- 

 erence than Galactomyia, whose type is Trichopoda radiata Lw. The 



