﻿42 



Bulletin American Museum of Natural History 



[Vol. LVII 



Systropus rex, new species 



Length, 16 mm. 



Female. — Head wine-red, the occiput lalack; sides of face and the cheeks, silvery 

 white. Frontal triangle long, slender, much narrowed to about two-thirds the distance 

 to the ocelli but the eyes very distinctly separated. Narrow portion of the front 

 brownish, the occiput gray pollinose except along the broad upper orbits; pile wholly 

 black, very short above. A dense tuft of short black pile on the brownish, rectangular, 

 median portion of the face. Antennae five mm. long, the first segment as long as the 

 other two combined, ferruginous, the second segment of the same color but appearing 

 black on account of the dense black hair, its length about three-eighths that of the 

 black third segment which is strongly narrowed apically, leaving the stylus longer than 

 wide. Palpi reddish, slender, tapering. 



Mesonotum slaty black, with a pair of very broadly separated broad, darker 

 vittîc on the anterior half; a broad, tapering, lateral yellow stripe extends from the 

 humerus to the suture on either side; notopleura reddish. Hair of mesonotum ex- 

 tremely short, black, but there is a triangle of sparse, yellowish tomentum in front of 



the scutellum, and the hair on the lateral 

 margins is longer. Scutellum transverse, 

 with broadly rounded corners, the base with a 

 reddish triangle on either side, the hair short, 

 yellowish on the basal half, longer and black 

 apically. Pleura black, with very short, ap- 

 pressed, black hairs; a broad reddish stripe 

 extends from the middle coxse to the base of 

 the wing. 



Coxae, anterior four femora and their 

 tibiae, except behind, rusty reddish, the femora 

 slightly darkened anteriorly. Anterior four 

 tibiae and first segment of their tarsi, whitish 

 yellow behind, the latter reddish in front, the 

 remaining tarsal segments blackish. Posterior 

 femora reddish brown on almost the basal 

 half, thence whitish yellow except the broad, 

 dark apex; posterior tibiae blackish brown on 

 the Vjasal half, thence pale yellow, the apical 

 fifth black; first segment of posterior tarsi yellow, with the broad base and narrow 

 apex black, the following segments black. 



Wings lightly tinged with fuscous, somewhat darker apically and in front, the 

 crossveins noticeably darker. Squamae yellow, with dark fringe. Haltères reddish, 

 with whitish knob. 



Abdomen blackish, with the second, third and narrow^ base of the fourth seg- 

 ments, whitish yellow, the second and third each with a slender dorsal triangle of black 

 reaching about three-fourths the distance to the segmental base. Lower genital 

 plate as in Fig. 2. 



Described from a single female, Garamba, June-July, 1912. 



Fig. 2. Sysirowus rex, new spe- 

 cies. Lower genital plate of female. 



