LEUCOSTOMA.—CLISTA. 207 
flab. Mexico, Tierra Colorada 2000 feet, Venta de Zopilote 2800 feet, Amula 6000 
feet, all in Guerrero (H. H. Smith).—Soutu Evrops. 
Three males and one female. 
Though the rather short descriptions of Meigen and Schiner are applicable in all 
respects, it is possible that the Mexican specimens may be not really conspecific with 
the European. I therefore have given here a full description of the Mexican insect. 
2. Leucostoma gravipes, sp. n., ¢. 
Shining black ; thorax anteriorly and all the segments of the abdomen with grey reflections; wings greyish, 
at the base dilute brownish ; small cross-vein beyond the middle of the discal cell. 
Length 6 millim. 
In most points agreeing with the preceding species, but more strongly built, the abdomen especially being 
more convex and the legs more robust. The front is broader and wholly black, the frontal band opaque, 
and the lateral portions somewhat shining; the face and cheeks are cinereous, with blackish reflections ; 
the palpi are pale rufous, filiform; the thorax has anteriorly some grey tomentum, in which three broad 
black bands are visible, the two lateral ones not reaching the front margin; the abdomen has over its 
whole length grey reflections; the wings are less clear, and their base has a brownish tint; the small 
cross-vein is distinctly beyond the middle of the discal cell; the apical cross-vein is slightly convex; the 
posterior cross-vein is curved, §-like. 
Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (H. H. Smith). 
A single male specimen. 
CLISTA. 
Clista, Meigen, Syst. Beschr. europ. zweifl. Ins. vii. p. 208 (1838). 
The characters of this genus, as given by Meigen (/. ¢.), and more amply exposed by 
Schiner (Fauna Austriaca, Dipt. i. p. 541), seem to be applicable to the small Tachinid- 
fly from Mexico which is described below. The abdominal macrochete of the Mexican 
insect are, however, less numerous and more degenerated than in the European species 
(especially than in C. feda). 
1. Clista musczeformis, sp. n. (92). (Tab. IV. figg. 18; 18a, wing.) 
Small, ovate, shining black; head partly silvery-white ; basal joints of the antennz rufous. 
Length 3°5 millim. 
Head hemispherical ; face and sides of the front silvery-white, the front narrower than the eyes ; frontal band 
velvety-black ; frontal bristles short and weak, not descending beneath the root of the antennz, those on 
the vertex a little longer; cheeks rather broad and swollen, and showing, like the oral margin, some 
reddish reflections. Antennz half as long as the face; basal joints rufous; third joint brownish-black, 
scarcely longer than the second ; arista bare, thin. Proboscis not very prominent; palpi (so far as they 
are visible) rufous. Thorax anteriorly with some light grey tomentum and indistinct black stripes. 
Abdomen shining black, without any whitish reflection, as long as broad, the first three segments of equal 
length, the anal segment much shorter; some short and weak macrochete are on the hind margins of the 
third and anal segments. Legs black; foot-claws and pulvilli short. Tegule whitish, large, the uppcr 
one shorter. Wings hyaline, longer than the abdomen; curvature of the fourth vein rounded ; apical cell 
ending at the tip of the wing, closed, but not petiolated ; small cross-vein under the end of the first vein 
