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
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