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UNITED STATES NATIONAL MUSEUM BULLETIN 22 4 



Abdomen: The abdomen is robust, shorter than the 

 wings, basally as wide or wider than the mesonotum. 

 The abdomen is robust terminally, a little narrowed; 

 pile of abdomen long, coarse and flat appressed, except 

 laterally but short in the females, directed forward on 

 the fourth to the seventh tergites. Sides of the first 

 tergite with 6 to 10 long, stout bristles. Sides of the 

 second tergite near the base sometimes with a tuft of 8 

 to 10 long, stout bristles in males; the posterior margins 

 laterally on the remaining tergites tend to have long, 

 slender bristles in males but they may be absent. In 

 the male there are six tergites with a trace of a seventh 

 visible laterally. Females with eight tergites, the eighth 

 tergite half as long as the seventh. Male terminalia 

 large, prominent, rotate one-fourth to the left; epan- 

 drium cleft into dorsal forceps, long, slender and 

 curved; hypandrium partly divided, besides fitting 

 tightly together ; all parts with numerous, densely beset, 

 slender bristles. Female terminalia with 5 or 6 pairs of 

 long, slender, sharp pointed spines. 



Distribution : Ethiopian : Daspletis hirtus Eicardo 

 (1925) ; vulpes Loew (1859). 



Dioctobroma, new genus 

 Figtjbes 101, 491, 967, 976, 1746, 1866 



Type of genus: Dioctobroma flavoterminatus, new 

 species. 



Medium size flies with short, robust, cylindrical ab- 

 domen, characterized by conspicuous, shaggy pile on 

 the head, thorax and legs and the prominent gibbosity 

 of the face, which bears dense, long pile. Metanotal 

 callosities with a large patch of stiff, erect pile. The 

 only other genera in the Dasypogoninae with such pile 

 on the metanotum are the genus Dicolonus Loew and 

 the genera in the Microstylum Macquart complex. 



Dioctobroma appears to be related to Daspletis Loew, 

 differing in the dense, coarse pile of face and mesono- 

 tum and scutellum, and in the bristles, which, while 

 quite numerous in both genera, are much weaker in 

 Dioctobroma. The pubescence in Dioctobroma is long 

 and exceptionally stout. The vein closing the fourth 

 posterior cell is transverse to this cell. The scooplike 

 process of the epandrium seen in Daspletis is absent. 

 Only males known. Length 18 mm. 



Head, lateral aspect: The head is comparatively 

 long, because of the prominent occiput and extensive 

 gibbosity of the face, but the eye is short. The upper 

 fifth of the face is moderately extended, its length 

 equals the thickness of the antenna and the lower part 

 of the face is abruptly produced into a prominent, 

 rounded, ventrally retreating gibbosity. The eye is 

 high, flattened anteriorly, gently convex anteriorly and 

 strongly recessive posteroventrally on the lower half. 

 Bristles are absent but there are numerous coarse hairs 

 on the upper third and the remainder of the occiput 

 is covered with dense, exceptionally long, fine pile. 

 The proboscis unusually robust, strongly attenuate on 

 the outer fifth, both from the upper and lower sur- 



faces. It extends well beyond the face, is directed 

 horizontally forward and bears laterally and ventrally 

 numerous, long, fine hairs which arise from the base; 

 on the apical fifth laterally is a fissure from which 

 arises a fringe of long, down-turned, bristly hairs and 

 at the apex is a lateral tuft of similar hairs. Palpus 

 clearly of two segments, the first excavated, the second 

 quite elongate and slender, attenuate apically and with 

 the apex bare and perforated. 



The antenna is attached a little above the middle 

 of the head and is elongate, especially on the third 

 segment. The first segment is twice as long as the 

 rather beadlike second segment, a little swollen toward 

 the base and except on its apical fourth it is densely 

 long, coarsely pilose on ventral and lateral surfaces, 

 with an additional tuft of dorsomedial pile. The 

 second segment is similarly pilose below and above at 

 the apex. The third segment is, including the micro- 

 segment, nearly twice as long as the first two. This 

 segment is narrow on the basal third, slightly dilated 

 beyond and narrowed at the apex ; it bears 4 or 5 dor- 

 sal setae and a stout, somewhat oblique microsegment 

 with blunt, apical spine; this microsegment is as long 

 as the second antennal segment. 



Head, anterior aspect: The head is distinctly wider 

 than the thorax and much wider than the mesonotum. 

 Face below antenna wide, considerably more than one- 

 fourth the head width, with nearly parallel sides on 

 the upper half and slightly divergent below. The 

 cheeks are rather prominent with a deep recess beside 

 the eye. Face densely, coarsely pubescent, without 

 pile on the short, upper portion but with dense, long, 

 conspicuous, coarse hairs over the whole gibbous por- 

 tion. Subepistoma large and oblique. The front is 

 divergent, together with the vertex wider than the face. 

 It is rather sunken and pollinose with a subocular band 

 of coarse pile and a tuft of similar pile in the middle 

 of each lateral half. The vertex is only moderately 

 excavated, with slanting and pilose sides, and the 

 ocellarium is remarkably conspicuous and high, with 

 nearly vertical sides. The large anterior ocellus placed 

 at the bottom of the process in front. The large space 

 between the ocelli is covered with numerous, long, 

 diverging, coarse hairs and there are several behind. 



Thorax: The thorax is rather high and strongly 

 arched both anteriorly and posteriorly. The mesono- 

 tum is covered with dense, coarse, subappressed pile, 

 undifferentiated, but becoming generally longer behind 

 the suture. Only the humerus, the lateral margin, and 

 the disc of the scutellum bear pollen. The humerus 

 is densely pilose, the lateral bristles on the mesonotum 

 are long, but weak and slender. There are 3 noto- 

 pleural, 3 or i supraalar, and 10 more slender postalar 

 bristles, and the scutellar margin contains a double 

 row of about 30 long, very slender bristles or bristly 

 hairs and other long pile on the disc. Propleuron, 

 posterior border of the mesopleuron, and its narrow 

 dorsal border densely pilose. The mesopleural pile 

 remarkably fine. Posterior corner of the sternopleu- 



