MUSCINA.—CLINOPERA. 305 
with a yellowish front-border and with a row of marginal macrochete; the anal segment with discal 
and marginal macrochete. Legs rufous; middle femora of the ¢ with two or three strong but not very 
long bristles near the apex on the hinder side (absent in the 2); hind tibize with a bristle beneath the 
middle on the outer side ; tarsi infuscate towards the tip ; foot-claws and pulvilli short in both sexes, the 
pulvilli whitish. Tegule yellowish. Wings broad, yellowish-hyaline ; small cross-vein under the end of 
the first vein and beyond the middle of the discal cell; third vein slightly arcuated ; curvature of the 
fourth vein rounded and forming a short apical cross-vein ; apical cell widely opened at the tip of the 
wing; posterior cross-vein slightly undulate, in the middle between the small cross-vein and the curvature 
of the fourth vein. In some specimens, especially males, the small cross-vein, and also the posterior 
cross-vein, but less distinctly, have a brown shadow. 
Hab. Mexico, Tierra Colorada 2000 feet, Amula 6000 feet, Xucumanatlan 7000 
feet, Sierra de las Aguas Escondidas 7000 to 9500 feet, and Omilteme 8000 feet, all in 
Guerrero (H. H. Smith). 
Several specimens of both sexes. 
Two male specimens, from Tierra Colorada, differ from the others in having fuscous 
legs, a more obscure abdomen, and a shining black proboscis, the black dorsal stripe 
being also indistinct. ‘They seem to form a transition to the following species; but 
as they have the eyes coalescent, I regard them as a dark variety of Muscina linea. — 
9. Muscina tripunctata, spn. ¢ ¢. 
Cinereous; thoracic dorsum with dark lines; abdomen testaceous or cinereous, with a blackish dorsal point 
on the second and following segments; antennee and palpi rufous. 
Length 7 millim. . 
Allied to the preceding species and in many characters agreeing with it. The eyes of the gd are not quite 
coalescent, but separated by a narrow line, and the frontal bristles form a double row over the whole 
length of the front; the front of the @ is a little broader and has a blacker coloration; the proboscis is 
blackish-brown, very shining. Thorax more generally cinereous, with yellowish shoulders, the dorsal 
stripes often diffuse. Scutellum brown, with yellowish tip. Abdomen more obscure and cinereous, with 
a blackish point on the second and following segments ; in a few specimens these points become somewhat 
elongate, almost forming an interrupted dorsal stripe. The legs are often more or less infuscate. 
Hab. Mexico, Amula, Xucumanatlan, and Omilteme in Guerrero, Cuernavaca in 
Morelos (H. H. Smith), Northern Yucatan (Gawmer). 
Several specimens of both sexes. 
Z 
CLINOPERA, gen. nov.* 
Head semiglobular; front not at all prominent—in the ¢ very small, triangular, with the eyes nearly or 
-quite coalescent above it, in the 2 as broad as the eyes; frontal bristles in the ¢ on the triangle above 
the antenne only. Cheeks narrow, their inferior part linear, densely beset with bristly hairs; vibrisse 
at the oral margin; some very short bristles above them. Eyes bare, in the ¢ the facets on the middle 
somewhat larger than the others. Antenne inserted on the median line of the eyes; third joint double 
the length of the second ; arista plumose on the upper and undersides. Proboscis with developed terminal 
lips; palpi small, cylindrical. Thorax quadrate ; dorso-central bristles distinct ; scutellum semicircular, 
with marginal macrochexte. Abdomen ovate, with short and weak macrochete, which usually are marginal 
on the second and third segments, and discal and marginal on the anal segment. Legs with weak bristles ; 
no bristle on the inner side of the middle tibiae; foot-claws and pulvilli short in both sexes. Tegule 
* ghéivo (to bend); wépas (apex). 
BIOL. CENTR.-AMER., Dipt., Vol. II., June 1896. 
bo 
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