10 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
TRYPANEA NIGRICORNIS (Coquillett) 
1899. Urellia nigricornis CoquiLteTT, Journ. New York Ent. Soc., vol. 7, p. 266. 
Described from a male in the National Museum collection taken 
in Colorado. 
The third antennal segment is deep black in the male, but in the 
females I have examined this segment is not much darker than the 
basal two. The frontal bristles in the male are much shorter than 
those of the female, the ocellars not attaining to the bases of the 
upper pair of infraorbitals, and the wing markings are as in figure 
ata 
The male has some well-developed anteroventral bristles on the 
apical half of the mid femur. In both sexes all the hairs and bristles 
on the abdomen are whitish yellow. Third wing vein with at most 
one or two hairs at extreme base below. 
Represented in the National Museum collection by specimens from 
Idaho, Wyoming, and Utah. In the Bryant collection there are 
specimens from Arizona. 
TRYPANEA IMPERFECTA (Coquillett) 
1902. Urellia imperfecta CoguiLLeTtT, Journ. New York Ent. Soc., vol. 10, p. 181. 
Originally described from a male specimen taken at Williams, 
Ariz. There is a female in the National Museum collection from 
the same locality and with the same data, but Coquillett did not 
associate this specimen with the type male. 
I figure the wing of the latter and also that of the female to show 
the sexual differences in markings (figs. 1, g, A). 
The fore tarsi of the male are normal in form and armature, the 
basal segment being at least three times as long as thick, there are 
no well-developed bristles on the anterior surface of the mid femur 
in either sex, and the frontal bristles of the male are very much 
shorter than those of the female. I can detect only one or two 
minute stiff hairs at the base of the third wing vein above and below. 
There are only the above mentioned two specimens in the National 
Museum. 
TRYPANEA FEMORALIS (Thomson) 
1868. Trypeta femoralis THomson, Kongliga Svenska Fregatten Eugenies Resa 
Omkring Jorden, Diptera, p. 582. 
There is a male specimen in the National Museum collection from 
Santa Clara, Calif., identified by Coquillett as this species that I 
accept as correctly identified. 
It belongs to the group in which the Y-shaped black mark at the 
apex of the wing is undeveloped, the tips of the third and fourth 
veins being unclouded (fig. 1,7). The extension of the black mark 
