Dec. 1897] Townsend: Diptera from the Tam aulipan Region. 177 
the 9 ’s, have the tip of abdomen distinctly blackish, but several $’s 
have it more or less reddish. 
Giglio-Tos makes this species a queried synonym of O. dosicides 
Walk. The specimens which I originally referred to O. euchenor (Tr. 
Ent. Soc. Wash., 1891) varied in length from 8-10 mm. ; while those 
I referred to O. dosiades were not only much shorter, but proportionately 
much smaller in size, so that it seemed hardly probable that all belonged 
to one species. I am aware that size may be of no importance as a 
specific character, and since I have more recently found specimens of 
all gradations in size between the two forms, so that it was impossible to 
separate them into two series, I am inclined to believe in their identity. 
I advocate, however, the use of the name euchenor , instead of dosiades 
as used by Giglio-Tos, and this for the reason that the description of 
euchenor better applies to the normal specimens. Were we to take the 
name that comes first in the pagination of Walker’s List, we would have 
to employ epytus , which is manifestly only a synonym of euchenor. 
Jurinia apicifera Walk. 
Eight specimens, Brownsville, as follows: Two, $ , 9 , June 21 ; 
one $, June 22, and four 9’s, June 24, taken on flowers of Lippia 
lanceolata Michx.; and one $ , June 28. Length, nJ^-14 mm. 
The species which I have always recognized as apicifera Walk, 
may be distinguished by the following characters : The front (except 
vitta), thorax and scutellum are characteristically brassy-yellowish 
(sometimes grayish-brassy) pollinose; the abdomen is shining black, 
the fourth segment being conspicuously silvery (or grayish-ashy) polli¬ 
nose. 
One of the specimens above mentioned ( $ , June 24), in which the 
thorax and scutellum have become greased, shows the ground color of 
the disc of thorax to be opaque black, while the humeri and lateral 
margins are tawny-yellowish, and the whole scutellum is brownish- 
yellow. 
This species has the frontal vitta of a soft brick-yellow, sometimes 
ocher-yellow. The occiput is clothed with brassy-yellow hair of the 
same tinge as the pollen of thorax, sides of front, and scutellum. The 
whole face, including sides of face and usually most of cheeks, in these 
Brownsville specimens is pure silvery-white; while in northern speci¬ 
mens from Michigan it is usually very distinctly golden. I have already 
remarked on this peculiarity of difference between northern and southern 
specimens (Tr. Am. Ent. Soc., XXII, p. 70). There are four narrow 
