SCELLUS. 203 



Stn. Medeterus exustus "Walker, Dipt. Saund. 211. 

 Scellus exustus Loew, Neue Beitr. VIII, 71, 1. 



Hale. Black. The face rather narrow, opaque from a bright 

 ochre-yellow dust. Antennae black. Front covered with white 

 dust. The middle of the upper side of the thorax is, at least in 

 my specimen, black, opaque, and exhibits some traces of gray 

 dust ; towards the lateral margin it is more bright and shows a 

 less distinct coppery reflection ; on the lateral margin itself there 

 is a broad longitudinal stripe covered with white dust. Scutellum 

 with two bristles, opaque upon the middle, with a thin, almost im- 

 perceptible coat of white dust, bright on the sides. Pleurae 

 bronze-black, on the upper half with a dusky copper-colored reflec- 

 tion, on the lower half with a thin gray-whitish dust. Abdomen 

 brilliant coppery-red, in a certain light it appears brass-colored 

 upon the posterior segments, in an oblique direction even green ; 

 its first segment almost reddish-violet. The upper appendages, 

 peculiar to the males of Scellus, are of a very considerable length, 

 white, near the root black, somewhat enlarged at the tip, curved 

 towards each other and of a yellow color, at the extreme tip black 

 and provided with a tuft of pale hairs, which are turned back- 

 wards. Coxae black, with a thin white-grayish dust, the foremost 

 with extremely short pale hairs, with a few stiff black little hairs 

 and near the tip with a few black bristles. Feet black, the femora 

 more metallic green-black, with coppery reflections; the fore 

 femora but short, very much thickened, toward the basis on the 

 whole under side beset with bristles of different length, on the an- 

 terior side with a row of stiff black bristles ; middle femora elon- 

 gated, thin, gently curved, on the under side almost entirely bare ; 

 the hind femora near the basis of the under side are enlarged into 

 a large blunt appendage, beset with large black spines, beyond 

 this appendage there is an arch-like excision ; then again they are 

 stouter and beset on the under side with black bristles. The fore 

 tibiae, which are comparatively stout, bear on the front side, not 

 far from the basis, a stout black thorn, their tip is elongated into 

 a coarse 1 tooth and their under side, which is beset with black 

 bristles, has somewhat before this tooth a small excision ; middle 

 tibiae long and rather slender ; their first half has only three short 

 bristles ; the second is fringed on the front side with a row of 

 short black bristles ; upon the posterior side somewhat beyond the 



