ROBBER FLIES OF THE WORLD 



527 



the costa itself is gently and slightly expanded at the 

 middle of the wing as compared with the plane of the 

 costa on the basal half. Ambient vein complete. 



Abdomen: Tlae abdomen is cylindroid and rather 

 strongly tapered ; sides of first tergit« are protuberant. 

 The first three tergites laterally bear some long, fine 

 hairs ; tlie posterior margins near the lateral borders of 

 the first through the seventh tergites each bear 2 rather 

 stout bristles. Eight tergites are present in the male, 

 but the eighth is almost completely eliminated medially 

 though comparatively wide laterally. Laterally it is 

 at least a third as long as the seventh tergite. The 

 superior forceps elongate, broadly and obtusely rounded 

 apically and somewhat flattened laterally. The hypan- 

 drium is longer than the gonopod and somewhat inden- 

 tate medially and ventrally and bears a dense tuft of 

 matted, convergent, bristly pile. 



Distribution : Ethiopian : Hohl)yus minor Bromley 

 (1947) ; nigroflavipes Hobby (1933). 



Genus Dasophrys Loew 



Figures 369, 739, 767, 1452, 1462, 1471, 1481, 2293, 2337 



Dasophrys Loew, Ofvers. Svenska Vet-Akad. FiJrhandL, voL 14. 

 pp. 362, 366, ISuS. Type of genus: Dasophrys longihariiis 

 Loew, 1858, by monotypy. 



Medium size flies characterized by the dense, vertical 

 band of facial bristles, the proclinate hairs of the upper 

 occiput, the exceptionally high, arched mesonotum 

 which bears prominent acrostical and dorsolateral hairs 

 and bristles, besides the strongly expanded costa, mar- 

 ginal and submarginal cells in tlie male. Length 20 

 mm. 



Head, lateral aspect: The face is rather prominent 

 but gently roimded beginning at the base of the antenna, 

 therefore without differentiated protuberance. The eye 

 is rather strongly recessive below, strongly convex an- 

 teriorly and wider above, the greater middle portion of 

 the posterior profile plane. The occiput is moderately 

 thick, extending to the vertex ; the pile is dense, abun- 

 dant and fine and begins at the middle of the head. 

 Below it is matted, long and obscures the ground color; 

 upper part of occiput with a wide band of fine, bristly 

 pile and near the vertex some long, slender, weak bris- 

 tles which are very strongly proclinate and reach to 

 the anterior eye margin. The proboscis is unusually 

 short and stout basally. The antenna is attached at 

 upper third of the head and comparatively elongate 

 and slender. The second segment is two-thirds as long 

 as the first and these segments combined are a little 

 longer than the third segment. The third segment is 

 unusually slender, slightly compressed laterally and 

 bears a short subsegment which is a fourth as long as 

 the style. The style itself, except towards the apex, is 

 of equal thickness with the microsegment ; apex of style 

 with a minute spine. The first segment bears 4 or 5 

 long, slender bristles laterally and with 3 or 4 long, 

 stout bristles below; second segment distally swollen 



with 4 long, stout setae above and 3 stout, longer bris- 

 tles below. 



Head, anterior aspect : The face below the antenna is 

 a fifth the head width and strongly divergent below, 

 Subepistomal area short, and oblique. Face pubescent, 

 especially laterally, bearing a wide, medial, vertical 

 band of exceptionally long, numerous, somewhat curved 

 bristles which are chiefly directed forward. Lateral 

 margins of the epistoma with weak bristles. Front 

 quite short; on each side it bears 8 to 12 very long, 

 slender, bristly hairs, slightly divergent; the vertex is 

 a little more convergent, deeply excavated with nearly 

 vertical sides. Ocellarium large, containing 4 or 5 pairs 

 of very fine, bristly hairs. Eyes with anterior facets 

 enlarged. 



Thorax: The thorax is densely appressed micropu- 

 bescent on each lateral fourth; the medial part of the 

 mesonotum is pollinose. The mesonotal pile consists of 

 a few, scattered, fine, long, nearly erect setae laterally 

 and a triple row of slender, long, backwardly directed 

 acrostical bristles, followed by a narrow bare strip. 

 There is a single anterior row of fine, moderately long, 

 dorsolateral bristles which near the middle becomes a 

 double row of stout, tuberculate bristles increasing in 

 length to a level corresponding to tlie wings, at which 

 point they are exceptionally long, the length decreasing 

 posteriorly toward the scutellum. The medial prescutel- 

 lar area has numerous, long, coarse, pale haii-s and this 

 area is pubescent. Humerus with numerous, long, fine 

 hairs, the stout, long, lateral bristles present consist 

 of 2 notopleural, 2 or 3 postsupraalar, 2 postalar, and 

 3 pairs of scutellar bristles. Scutellum thick, convex, 

 pubescent, with long and more or less tangled matted 

 pile which is chiefly erect. Propleuron with fine, matted 

 pile below, more scattered pile above ; pronotum with 3 

 pairs of stout bristles ; upper mesopleuron with numer- 

 ous, fine, long, erect bristly pile and similar pile on 

 the upper sternopleuron ; the pteropleuron and post- 

 hypopleuron bear numerous, long, slender bristles. 

 Metapleuron with a vertical band of many similar, quite 

 long bristles. Metanotal slopes without pile, pubescent 

 only. The lateral and ventral metasternum bear abun- 

 dant, long, fine pile ; postmetacoxal area membranous ; 

 tegula pubescent only ; squama with a multiple fringe. 



Legs : All the femora are stout and distinctly though 

 moderately thickened. The hind femur is appressed 

 setate above; on the lateral, ventral and medial surfaces 

 it bears rather numerous, extremely long, fine, bristly 

 hairs; the long, stout bristles consist of 1 at apex dorso- 

 medially. A transverse group of 3 is situated dorsally 

 a short distance back from the apex; the outer mem- 

 ber forms a group of 2 dorsolateral elements, the sec- 

 ond member is placed at the middle. The ventrolateral 

 margin has 6 especially stout, long, apically blunt 

 bristles ; medially there are 2 stout, distal and 1 basal 

 bristle. The hind tibia bears 3 dorsolateral, 3 or 4 dor- 

 somedial and 3 especially stout, long, ventrolateral 

 bristles ; apical circlet of 8 bristles. The middle femur 

 bears a long, stout, posterior subapical bristle and an 

 anteroventral row of 4 long, stout bristles ; middle tibia 



