246 . DIPTERA, 
Hab. Mexico, Xucumanatlan in Guerrero 7000 feet, Cuernavaca in Morelos (H. H. 
Smith). 
Three male and three female specimens. | . 
I have examined the typical example of Microphthalma calogaster, Big. ; it is 
perfectly conspecific with Macrometopa mewicana, Br. et Vv. Berg. These authors’ 
specimens, like that of Bigot, were from Mexico. | 
STENODEXIA, gen. nov. * 
Head hemispherical ; front narrowed behind ; frontal bristles descending to the root of the antenne; face 
short, not carinated; vibrissal swellings parallel; vibrisse inserted at a short distance above the oral 
margin; eyes hare; the lower part of the occiput greatly developed and with rows of hairs. Antenne 
inserted on a line drawn through the centre of the eyes, slender, shorter than the face ; arista moderately 
plumose. Proboscis short and thick, with very distinct terminal lips ; palpi small, cylindrical. Abdomen 
nearly cylindrical, twice as long as the thorax, the segments of equal length ; discal and marginal macro- 
cheete present. Legs slender ; foot-claws and pulvilli elongate in the male. Wings a little shorter than the 
abdomen, with a costal spine and the whole costa with short bristles ; apical cell narrowly opened near 
the wing’s tip ; posterior cross-vein in the middle between the small cross-vein and the curvature of the 
fourth vein. 
1. Stenodexia albicincta, sp. n.,3. (Tab. V. figg. 15; 154, head.) 
Black ; thorax whitish-grey, anteriorly with obsolete black lines; second and third abdominal segments with 
whitish front borders. 
Length 8 millim. 
Head black, with whitish reflections; frontal band black, narrow; beard white. Antenne black; second 
joint somewhat rufous, with several bristles ; third joint twice as long as the second. Proboscis black, 
its terminal lips and the palpi rufous. Thorax covered with a whitish-grey tomentum ; some black lines 
are scarcely conspicuous before the transverse suture ; scutellum blackish. Abdomen shining black; the 
second and third segments with whitish front borders, that of the third segment a little broader than the 
other ; anal segment (seen laterally) obliquely truncated, with two small rufous appendages ; first segment 
with two marginal macrochate ; second segment with two discal and two marginal macrochete; third 
and anal segments with two discal and a row of marginal macrochete. Legs black; tibise with scattered 
bristles ; pulvilli greyish-yellow. Tegule and halteres yellowish. Wings greyish-yellow ; curvature of 
the fourth vein with a blunt angle; apical and posterior cross-veins nearly straight. 
_ Hab. Mexico, Teapa in Tabasco (H. H. Smith), Temax in North Yucatan (Gawmer). 
Seven specimens (all males). : 
. CHOLOMYIA. 
Cholomyia, Bigot, Bull. Soc. Ent. Fr. 1884, p. xxxvii. 
Front slightly prominent, in the female as broad as the eyes, in the male so narrowed that the eyes are nearly 
contiguous on the vertex ; frontal bristles descending to the root of the antenne ; face somewhat concave, 
not carinated; cheeks bare, their lower portion equalling half the longitudinal diameter of the eyes ; 
vibrissal swellings parallel; vibrissee inserted just at the oral margin. Eyes bare. Antenne inserted ona 
line drawn through the centre of the eyes; third joint: much longer than the second ; arista long-plumose. 
Proboscis short, retractile ; palpi cylindrical. Abdomen conical ( ¢) or elongate-oval (2), with only 
marginal macrochets. Legs slender, with weak bristles, the tarsi of the first and hind pairs longer than 
© ‘ 
* grevds (narrow); Dexia, 
