MICROCHATINA.—CAMARONA. 241 
Microchetina seems to have some relationship with the European genera Syntomocera 
and Zeuxia, and with the exotic genus Trichoprosopus, Macq., but may easily be 
recognized by its peculiar venation. 
1. Microchetina cinerea, sp. n., ¢ 9. (Tab. V. figg. 10; 10a, head.) 
Cinereous ; palpi and basal joints of the antenne rufous ; legs black. 
Length 6°5 millim. 
Greyish-cinéreous ; frontal band rufous, in the male linear, in the female as broad as the lateral portions ; 
basal joints of the antenne rufous, the third joint blackish but with a whitish tomentum; second joint 
prominent and bristly ; third joint in the male slender and twice as long as the second, in the female a 
little longer than the second ; arista black, thickened in its proximal half; proboscis black; palpi pale 
rufous. Thoracic dorsum with indistinct dark lines ; abdomen with scarcely any obscure reflections, the 
hairs and macrochete arising from small black points; ventral surface in the male densely haired. Legs 
black ; foot-claws and pulvilli slightly elongate in the male. Tegule whitish. Wings grey; the costal 
vein, the end of the second vein, the point where the third vein issues from the second, and all the 
cross-veins black ; apical cross-vein distinctly curved ; posterior cross-vein straight or slightly convex. 
_ Hab. Mexico, Presidio de Mazatlan (Forrer). 
Two male and four female specimens. 
CAMARONA, gen. nov. * 
Head hemispherical ; front not prominent, much narrowed in the male; face perpendicular, slightly carinated 
in the middle; eyes bare; cheeks broad, their lower portion equalling at least half the longitudinal 
diameter of the eyes; vibrissal swellings slightly convergent ; vibrissw inserted at a short distance above 
the oral margin and accompanied by several other bristles. Antenne: as long or nearly as long as the 
face; arista densely plumose. Proboscis short, with large terminal lips; palpi rather thick. Abdomen 
ovate, convex; first segment shorter than the second; male genitals somewhat prominent; macrochete 
only at the hind margins of the segments. Legs rather long, with many bristles; foot-claws and pulvilli 
elongate in the male. Wings longer than the abdomen; apical cell opened at some distance before the 
wing’s tip; curvature of the fourth vein without appendage; posterior cross-vein beyond the middle 
between the small cross-vein and the curvature of the fourth vein. 
1. Camarona xanthogastra, sp.n., ¢. (Tab. V. figg. 11; 11 a, head.) 
Black ; abdomen yellow, with trigonal dorsal spots and the anal segment black ; antenna and palpi rufous. 
Length 9-115 millim. 
Head dark grey, the lateral portions of the front and the upper part of the cheeks with white, the lower 
portion of the latter with reddish-brown, reflections; front on the vertex one-third the width of the eyes ; 
frontal band blackish, with fine longitudinal grooves ; the face much shorter than the front. Antenne 
rufous ; second joint with short hairs and a long bristle ; third joint three times as long as the second, 
rounded at the tip; arista black, thickened in its proximal half. Proboscis brown, the terminal lips 
with yellow hairs; palpi dark rufous, with black hairs, Thorax and scutellum black, with a slight 
bluish tint; thoracic dorsum anteriorly with some grey tomentum and indistinct black stripes. Abdomen 
yellow, transparent, the first three segments with black trigonal dorsal spots—the spot of the first 
segment enlarged towards the base, that of the second much smaller and extended in front into a long 
point, that of the third segment united posteriorly to the black hind border of the segment, this black 
* kappa; convex. 
BIOL. CENTR.-AMER., Dipt., Vol. II., May 1891. a7 
