240 DIPTERA. 
MEGAPARIA, gen. nov.* 
Head somewhat swollen ; front (2) more than twice as broad as the eyes; frontal bristles weak and few in 
number ; two stronger bristles on the vertex ; face nearly perpendicular, longer than the front, slightly 
carinated on its upper half; vibrissal swellings convergent ; vibrisse inserted far above the oral margin, 
which is not at all prominent; eyes bare; cheeks very broad, their lower portion equalling the longi- 
tudinal diameter of the eyes, their upper portion beset with short bristly hairs arising from dark points. 
Antenne very short, inserted below a line drawn through the centre of the eyes; third joint nearly as long 
as the second ; arista short-plumose. Abdomen elongate-oval, convex ; on the hind margin af the second 
and third segments two dorsal macrochete and on each side a lateral one; anal segment with some 
shorter macrochets. Legs long and slender, with weak bristles. Wings longer than the abdomen ; apical 
cell closed and short-petiolated ; posterior cross-vein beyond the middle between the small cross-vein and 
the curvature of the fourth vein, this curvature angular but without appendage. 
This genus is allied to Dinera, but differs by a more elongate face and by the con- 
vergent vibrissal swellings. 
1. Megaparia venosa, sp. n., 2. (Tab. V. figg. 9; 9a, head.) 
Cinereous; thoracic dorsum brownish; abdomen with brown spots on the hind margin of the segments ; basal 
joints of the antenne rufous, the third joint fuscous ; legs rufous, the tarsi black. 
Length 10 millim. 
Head light grey; frontal band fuscous, as broad as the lateral portions, which have reddish reflections ; above 
the root of the antenne a small, shining, rufous, triangular space. Antenne rufous; second joint some- 
what prominent, with a bristle ; third joint infuscated, scarcely longer than the second ; arista thickened 
at the base. (Proboscis and palpi retracted in the oral cavity). Thorax and scutellum cinereous ; 
thoracic dorsum, except the margins, brownish. Abdomen cinereous, with brown reflecting spots on the 
hind margins of the segments and with the hairs arising from small black warts. Legs obscure rufous, 
the tarsi blackish-brown. Tegule yellowish-white. Wings brownish, their venation thick, especially the 
cross-veins ; small cross-vein on the middle of the discal cell and with a fuscous transverse spot; the 
fourth vein slightly bent downwards and turning with an acute angle into the apical cross-vein, which is 
somewhat concave; posterior cross-vein curved. 
Hab. Mexico, Ciudad in Durango 8100 feet (Forrer). 
A single female specimen. 
MICROCHATINA, gen. nov.} 
Head hemispherical ; front of the male narrowed behind, on the vertex half as broad as the eyes, that of the 
female broader than the eyes; frontal bristles short, the ocellar bristles and those on the vertex longer ; 
in the female on each side a pair of orbital bristles; eyes bare; face nearly perpendicular; oral margin 
not prominent ; vibrissal swellings convergent ; cheeks broad, their lower portion equal to two-thirds the 
longitudinal diameter of the eyes, their upper portion, at some distance from the inner orbits, with a row 
of hairs; vibrissee inserted considerably above the oral margin. Antenne short, inserted on a line drawn 
through the centre of the eyes; arista not longer than the antenne, short-plumose. Proboscis as long as 
the head ; palpi filiform. Abdomen ovate ; second and third segments with submarginal, the anal segment 
with discal and marginal, macrochete. Legs rather short, with scattered bristles. Wings with a costal 
spine; apical cell closed and rather long-petiolated ; small cross-vein beyond the middle of the discal cell ; 
curvature of the fourth vein angular and with a short appendage ; posterior cross-vein before the middle 
between the small cross-vein and the curvature of the fourth vein. 
* uéya (large) ; mapect (cheek), 
fT pixpos (small); yaérn (bristle, arista). 
