ART. 16. NORTH AMERICAN SCELLUS GREENE. 5 



white dust, bright on the sides. Pleurae bronze-black, on the 

 upper half with a dusky copper-colored reflection, 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 seg- 

 ments, 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 toward each other and of a 

 yellow color, at the extreme tip black and provided with a tuft of 

 pale hairs, which are turned backward. 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 short, but very much thickened, 

 toward the basis on the whole underside beset with bristles of dif- 

 ferent length, on the anterior side with a row of stiff black bristles; 

 middle femora elongated, thin, gently curved, on the underside 

 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 archlike excision; 

 then again they are stouter and beset on the underside with black 

 bristles. The fore tibiae, which are comparatively stout, bear on 

 the front side, not far from basis, a stout black thorn, their tip is 

 elongated into a coarse tooth and their underside, which is beset 

 with black bristles, has somewhat before this tooth a small ex- 

 cision; middle tibiae long and rather slender; their first half has 

 only three short bristles; the second is fringed on the front with a 

 row of short black bristles ; upon the posterior side somewhat beyond 

 the middle, there are a few long black bristles, and between these 

 and the tij) of the tibia, some long, curly black hairs. The hind 

 tibiae are much stronger than the middle tibiae, their first half is 

 stouter than the second and the front side before the tip is armed 

 with a strong black bristle. Tarsi plain, their joints of decreasing 

 lenglh, the first joint of the middle tarsi with a few bristles. Hal- 

 teres brownish-black. Wings blackish, all their veins broadly 

 margined with black; the margins of the costa and of the first 

 four longitudinal veins are entirely confluent, so that the anterior 

 part of the wings appears altogether black; upon the middle of the 

 posterior transverse vein and upon the curve of the last segment 

 of the fourth longitudinal vein there is a black spot; the costal 

 cell is of a dark brown color. 



" Female. — The only female which I possess is not as well pre- 

 served as the described male, especially the characters of the face 

 can not be recognized with certainty; I would tlierefore recall the 



