1?3 
hairy one-half the distance from the lowest frontal bristle to the 
vibrissas, the latter inserted slightly above the anterior edge of 
the oral margin, facial ridges bristly on the lowest sixth ; antennae 
three-fourths as long as the face, the third joint one and one-half 
times as long as the second, arista pubescent, thickened on the 
basal two-fifths, the penultimate joint shorter than broad, cheeks 
almost as wide as the eye height; thorax opaque gray pollinose, 
marked with three black vittre; wings hyaline, calypteres white; 
length, 12 mm. Colorado; and Mesilla. X. Mex. Three female 
specimens, captured by Carl F. Baker and T. D. A. Cockerell. 
Type No. 3584, U. S. National Museum opaca n. sp. 
Genus PARACH^TA, new genus. 
The principal characters of this genus have been given in the table 
of genera published on previous pages. The type species is black, 
the first two joints of antennae, palpi, hind corners of thorax, and the 
scutellum yellow; sides of first three segments of abdomen sometimes 
tinged with yellowish; front of male one-half as wide as either eye, 
destitute of orbital bristles, frontal bristles descending to base of 
third antennal joint, cheeks one-fourth as wide as the eye height, 
vibrissa? inserted one- third the length of the second antennal joint 
above the anterior edge of the oral margin, facial ridges bristly on the 
lower two-thirds to three-fourths; antennae four-fifths as long as the 
face, the third joint one-third as long as the second, arista thickened 
on the basal half, the penultimate joint scarcely longer than broad; 
thorax thinly gray pollinose, marked with four black vittae, four 
postsutural and three sternopleural macrochaeta', scutellum bearing 
four pairs of long marginal; abdomen shining, destitute of pollen, no 
macrochaetae on the first two segments, only a marginal row on the 
third; hind tibiae densely ciliate with scale-like bristles; wings hyaline, 
the bases brownish, calypteres brown; length, 13 mm. Ithaca and 
New York, N. Y. (Dipteres Exotiques, Supplement 1, p. 158; 1846: 
Blepliaripeza. Blepliaripeza inermis Bigot, Annates Soc. Ent. France, 
p. 91; 1888.) bicolor Macq. 
Genus BLEPHARIPEZA Macq. 
Blepliaripeza Macquart, Dipteres Exotiques, Vol. II, Part II, p. 211(54); 1813. 
Rileya Brauer and Bergenstamin, Zweif. Kais. Mus. Wien, VI, p. 121; 1893. (Xon 
Ashmead, Entomologica Americana, Vol. IV, p. 42; June, 1888. Xon Howard, 
loc. cit., p. 80; July, 1888.) 
Rileymyia Townsend, Entomological News, Vol. IV, p. 277; October, 1893. 
The latter name was proposed to take the place of Kileya, which is 
preoccupied in the Hymenoptera. A comparison of specimens of Bilei/a 
americana (the type species of this genus), identified by Brauer and 
Bergenstamm, with specimens of Blepliaripeza leueoplirys (the type 
species of the latter genus), fails to disclose any difference of generic 
