528 



tTNITED STATES NATIONAL MUSEUM BULLETIN 224 



with 2 slender distal dorsal, 2 stout distal posterior, and 

 3 especially long, stout, curved, ventral bristles begin- 

 ning at the middle, and in addition with an anterior 

 and posterior fringe of 7 or 8 exceptionally long, slen- 

 der, bristly hairs. The anterior femur is without 

 bristles but has an abundant ventral fringe of extreme- 

 ly long, bristly hairs ; its tibia has 5 exceptionally long, 

 stout, posteroventral bristles and equally long, fine, 

 bristly hairs ; dorsally there are only 3 slender bristles 

 beyond the middle. Tarsus ends in large, long pulvilli, 

 long empodium, and a long sharp claw bent at apex. 



Wings : The wings are broad and subhyaline, some- 

 times tinged with brown. The costa, marginal and 

 submarginal cells are expanded and strongly rippled 

 and in some species the male wing in the middle is car- 

 ried forward in a conspicuous hump. Marginal C€ll 

 closed with short stalk ; the anterior branch of the tlurd 

 vein ends just above wing apex; the first posterior 

 cell is not noticeably constricted, but the discal cell is 

 strongly constricted in the middle by the anterior con- 

 vexity of the fourth posterior cell ; the fourth posterior 

 cell is closed and stalked ; anal cell closed ; second basal 

 cell ends with a short middle vein or none ; alula large, 

 ambient vein complete. 



Abdomen : The abdomen is distinctly subcylindrical, 

 slightly tapered and comparatively narrow; the first 

 tergite is strongly swollen and convex laterally. Seven 

 tergites are present in the male with the eighth appear- 

 ing as an obtuse, triangular lateral process on either 

 side. Pile of abdomen scanty but fine, more or less 

 erect, setate and fine and much longer laterally and on 

 the sternites. The posterior submargins of the tergites 

 bear several, quite long, stiff hairs; the upper 2 of these 

 elements might be described as extremely weak bristles. 

 Male terminalia large, elongate, conspicuous; the su- 

 perior forceps directed obliquely upward. 



Distribution: Ethiopian: Dasophrys hypselopterus 

 Engel (1929); nigricans Wiedemann (1821); paron 

 Walker (1849 [ = longibarhus Loew (1858)1; persona- 

 ifMS Schmer (1868). 



Genus Neodasophrys Ricardo 

 FiGUHES 338, 764, 1457, 1460, 1467, 1470, 2283, 2342, 2377 



Neodasophrys Ricardo, Ann. Mag. Nat. Hist., ser. 9, vol. 5, p. 

 440, 1920. Type of genus: Neodasophrys natalensis 

 Ricardo, 1920, by present designation. 



Moderately large flies with tapered abdomen, very 

 spiny legs. The face is rounded and protuberant and 

 densely beset with bristles through the middle. The 

 high, arched mesonotum bears numerous, rather long, 

 acrostical and still longer dorsocentral bristles. Length 

 25 mm. 



Head, lateral aspect: The face is prominent, except 

 immediately beneath the antenna, where it is short; it 

 begins to rise or extend forward and forms a well de- 

 veloped, gently rounded protuberance. The eye is 

 strongly recessive ante rovent rally below and the re- 

 cession begins rather sharply at the middle of posterior 

 profile; the anterior profile is strongly convex. The 



occiput is very extensive and thickened below, and ex- 

 tends undimmished to the vertex. The pile of the 

 occiput is abundant, fine and rather long doi-sally, as- 

 suming the character of weak bristles on the upper sixth 

 and associated at the extreme upper corner of the occi- 

 put behind the eye with 5 or 6 pairs of strongly pro- 

 clinate, stout bristles. The pile of the lower occiput 

 is extremely copious, abundant and stiff and obscures 

 the groimd color. The proboscis is of moderate length, 

 without noticeable ridge subcylindrical to subquadrate, 

 somewhat flattened on the dorsal aspect, especially near 

 the apex, where it is rugose and micropunctate ; the 

 base is onJy slightly swollen. The apex is a little tapered 

 from below and bears some stiff, apical pile and nu- 

 merous, long hairs ventrally. Palpus small, of 1 seg- 

 ment, bearing long, stiff hairs. The antemia is at- 

 tached at the upper third of head; the first segment 

 is nearly twice as long as the second, the third is not 

 quite twice as long as the second and bears a moderately 

 long microsegment, beyond which is an extremely long, 

 thick, densely pubescent style. For most of its length 

 the style is as wide as the microsegment and it is fully 

 as long as the third segment, attenuate apically and at 

 the apex bears a moderately long, stiff bristle. The 

 first segment bears long, stiff hairs above; laterally 2 

 or 3 and ventrally 7 or 8 long, stiff, oblique bristles. 

 The second segment has 3 or 4 bristles dorsally and 

 laterally and below at the middle 2 quite long, stout and 

 2 weaker, shorter ones. 



Head, anterior aspect : The face below the antenna is 

 two-ninths of head width and divergent below. Sub- 

 epistomal area short, small and oblique, deeply concave 

 and pubescent. The face is pubescent, without pile but 

 with numerous, very long, slightly curved, anteriorly 

 directed, moderately stiff bristles which extend down 

 the middle of the face and leave the lateral margin 

 without bristles. These bristles extend almost to the 

 base of the antenna, and at bottom of face they extend 

 laterally along the sides of the epistoma where they are 

 somewhat more slender and shorter. The front is dis- 

 tinctly though moderately divergent, unusually short 

 and the vertex rather strongly convergent. Laterally 

 there is a large, oval patch of numerous, long, stiff hairs 

 on the sides of the front. The vertex is deeply excavated 

 with steep sides, the ocellarium moderately large with 

 6 to 8 pairs of quite long, stiff hairs. Eye facets cen- 

 trally enlarged and zoned. 



Thorax: The mesonotum and pleuron poUinose or 

 micropubescent and appressed, except down the mid- 

 dle third, which is bare. Pile of mesonotum scanty but 

 composed of unusually long, subappressed, basally stout, 

 finely attenuate setae. There is a double, dorsal row of 

 acrostical elements longer and comprising distmct bris- 

 tles, each row doubled anteriorly. Dorsocentral ele- 

 ments are also distinct, still longer ; just before the mid- 

 dle the individual elements become extremely long and 

 contain 9 in each row to the scutellum. In the pre- 

 scutellar area is considerable, long, delicate, crinkled, 

 opaque, white pile which becomes even more abundant 



