242 DIPTERA. 
border laterally somewhat enlarged; anal segment black, except a narrow front border, which is rufous; 
the first segment with two lateral macrochete ; the second with two dorsal and two lateral macrochete ; 
the third and anal segments with a row of macrochewte on the hind margins. Legs black; hind tibie 
piceous ; pulvilli yellow; front tibise outwardly with a row of short bristles; middle tibie with some 
long bristles ; hind tibia outwardly with several bristles of unequal length. Tegule dark brown. - Wings 
brownish-grey ; small cross-vein before the middle of the discal cell; fourth vein bent downwards before 
its curvature, which is nearly rectangular; apical cross-vein slightly concave; posterior cross-vein 
distinctly curved. 
Hab. Mexico, Sierra de las Aguas Escondidas 7000 feet, Omilteme 8000 feet, both 
in Guerrero (H. H. Smith). 
Four male specimens. 
2. Camarona ceruleonigra, sp. n., 2. 
Bluish-black ; antenne and palpi rufous. 
Length 7-5 millim. 
Head black, with whitish-grey reflections; front as broad as the eyes; frontal band blackish-brown ; close to 
the frontal bristles are two stout orbital bristles; face longer than in C. wanthogastra, scarcely shorter 
than the front. Antenne dark rufous; second joint with short hairs and a long bristle ; third joint three 
times as long as the second ; arista black, thickened at the base. Proboscis black, with the terminal 
lips brown; palpi rufous, thick, especially towards the tip. Thorax, scutellum, and abdomen shining 
black with a bluish tint; thoracic dorsum anteriorly with some greyish-white tomentum ; abdomen with 
long macrochetz at the hind margins of the second and following segments. Legs black; front tibise 
outwardly with a row of bristles; middle tibiee with two very long bristles; hind tibiae outwardly with 
several bristles of unequal length ; foot-claws and pulvilli short. Tegule brownish-black. Wings grey; 
small cross-vein before the middle of the discal cell; apical cross-vein straight; posterior cross-vein 
slightly curved. 
Hab. Mexico, Omilteme in Guerrero 7000 feet (H. H. Smith). 
A single female specimen. 
DEXIA. 
Dexia, Meigen, Syst. Beschr. europ. zweifl. Ins. v. p. 33 (1826) (sensu stricto). 
Head hemispherical, somewhat swollen; front of the male usually narrowed behind, that of the female as 
broad as the eyes or even broader (in the Mexican species, described below, the front is almost equally 
broad in both sexes); face perpendicular, carinated; oral margin prominent; vibrissal swellings 
distinctly convergent ; vibrissz inserted at some distance above the oral margin; eyes bare; cheeks 
broad, their lower portion equalling at least half the longitudinal diameter of the eyes. Antenne 
shorter than the face, inserted on or beneath a line drawn through the centre of the eyes; arista plumose. 
Proboscis short ; palpi filiform. Abdomen conical or elongate-oval, with discal and marginal, in some species 
only with marginal, macrochetx. Legs long and slender, in the male the foot-claws and pulvilli elongate. 
Wings longer than the abdomen; apical cell opened at a little distance before the wing’s tip; curvature 
of the fourth vein angular, sometimes with an appendage; posterior cross-vein beyond the middle 
between the small cross-vein and the curvature of the fourth vein. 
In the Central-American collections before me there is only a single species which 
possesses the characters of the European representatives of the genus Dexia in its 
restricted sense. 
