ANTHOMYIA.—HYLEMYIA. 337 
certainty with the above-described males. I abstain, however, from giving names to 
the females and from describing them: the number of species which apparently never 
will be recognized is already enormous in dipterology. 
LASIOPS. 
Lasiops, Meigen, Syst. Beschr. vii. p. 323 (1838). 
This genus is mentioned here because Dr. Giglio-Tos has described a Mexican species 
under the name of Lasiops mexicana. I venture to suggest, however, that this may be 
identical with Z'richophthicus crenatus, Bigot (antead, p. 331). Both genera have the 
eyes pilose and contiguous in the male, the arista bare or somewhat pubescent, &c. ; 
but Lasiops differs from Trichophthicus in having the abdomen shorter (the first segment 
in the male not longer than the second), the lower scale of the tegule wholly covered 
by the upper, and the anal vein elongate, reaching more or less distinctly to the border 
of the wing. It is possible that even such an intelligent dipterologist as Dr. Giglio-Tos 
has made a mistake in the determination of the genus of this minute insect. 
1. Lasiops mexicana. 
Lasiops mexicana, Gigl.-Tos, Boll. Mus. Zool. Comp. Anat. di Torino, vii. no. 147, p. 10°; Mem. 
R. Accad. Scienze di Torino, ser. 2, xlv. (sep.) p. 28°. 
Hab. Mexico !?. 
HYLEMYIA. 
Hylemyia, Robineau-Desvoidy, Essai sur les Myodaires, p. 550 (1830). 
The genus Hylemyia is principally distinguished by the following characters :—Hyes 
bare, nearly or quite contiguous in the male; arista plumose; abdomen elongate, the 
- first segment (in ¢ ) nearly double as long as the second; legs slender; tegule small, 
the lower scale covered by the upper; anal vein elongate, reaching more or less 
conspicuously to the border of the wing. It is closely allied to Hydrophoria, but differs 
from it in the less developed tegule, of which the lower scale is not visible. 
Three Mexican species are known to me, all of which are described as new :— 
1. Proboscis longer than the head, thin, and without enlarged terminal lips 
(legs rufous). 2 6 ee ee eee ee eee we we ee tenuirostris. 
Proboscis of usual shape. . . woe eee ee we 
2. Legs wholly black ; abdomen with a black dorsal line woe » . . urbica, 
Legs black, with the middle and hind femora rufous at the base; “abdomen 
with a black dorsal line and transverse bands . . . . . « «© « © « monticola. 
1. Hylemyia tenuirostris, sp. n.,3. (Tab. VIII. figg. 15; 15a, head in 
profile.) 
Cinereous ; abdomen with a black dorsal line; legs rufous, with black tarsi; antenne black ; proboscis long 
and slender. 
Length 5:5 millim. 
BIOL. CENTR.-AMER., Dipt., Vol. IT., December 1896. 24 
