DASYPGG0N1NAB 



ROBBER FLIES OF THE WORLD 



163 



ron with a few fine hairs; metapleuron densely beset 

 with long, fine hairs, much of these crinkled. Meta- 

 notal callosity bullose and densely pilose, also pubes- 

 cent, but the middle of the metanotum nearly bare. 

 Presternum fully dissociated; metasternum pilose lat- 

 erally and below; basalare with fine pile and 

 micropubescence. 



Legs: The moderately long femora are quite stout 

 but scarcely swollen. Together with the tibiae they 

 are coarsely, long, subappressed pilose, the hind femur 

 bears numerous, long, erect hairs in addition to the 

 more abundant, somewhat appressed pile and there is 

 a conspicuous, erect fringe of long pile on the ventral 

 surface of the hind tibia. This tibia stout and 

 slightly curved. Bristles on the legs are exceptionally 

 numerous, moderately stout, sharp, and pale in color. 

 The hind femur bears 4 dorsolateral bristles, 7 ven- 

 trolateral bristles confined to the outer half, and at the 

 outer sixth an oblique circlet of 6 bristles. Hind tibia 

 with 5 dorsolateral, 8 dorsomedial, 1 middle medial and 

 on the outer half 3 ventrolateral bristles; apex with 

 10 bristles. Middle femur with 7 bristles along the 

 anterior surface and 2 near the apex posteriorly; its 

 tibia dorsally on each side has 7 or 8 bristles and sev- 

 eral posteroventral bristles. Anterior femur with 1 

 bristle anteriorly in the middle; its tibia quite like the 

 middle tibia and with 4 posteroventral bristles; apex 

 of tibia simple. Claws stout, bluntly pointed at apex ; 

 the pulvilli long ; the empodium bladelike. 



Wings: Marginal cell widely open but second vein 

 slightly recurrent. First and fourth posterior cells 

 closed and stalked ; anal cell closed in the margin and 

 the wing notched. Alula moderately large, ambient 

 vein complete. 



Abdomen : The abdomen is a little less than twice as 

 long as the thorax, comparatively robust, the first four 

 segments are nearly or quite as wide as the mesonotum, 

 the last two almost as wide. Pile short, scanty, ap- 

 pressed and setate but becoming longer along the down- 

 turned lateral margins, and especially conspicuous 

 though scanty on the sides of the first three segments. 

 Bristles absent, including the first segment. Surface 

 of the abdomen chiefly shining with narrow pollinose 

 fascia at the end of the second and third segments, 

 expanding to triangular spots laterally and similar 

 triangles on the next two segments. The first segment 

 is more than one-third as long as the second. Males 

 with seven tergites, the sixth is long, the seventh only 

 one-fifth as long as the sixth and still shorter in length 

 laterally; its posterior margin is curved and this seg- 

 ment tends to be tucked in beneath the sixth. Male 

 terminalia large, completely rotate, broad and wide, 

 the genital cavity is widely open, the hypandrium tri- 

 angular; the superior forceps broad at the base, little 

 longer than wide, and completely divided. The 

 gonopod shorter. 



Distribution : Ethiopian : Dioctobroma flavotermina- 

 tus, new species. 



Dioctobroma flavoterminalus, new species 



Length 16 mm. Male. 



Head: The head is black in ground color with a 

 yellowish brown triangle on the upper half of the face, 

 along the eye margin extending medially towards each 

 antenna and limited to the upper border of the extensive 

 and rather abrupt facial gibbosity. The whole of the 

 face is covered with coarse, appressed, long, brownish 

 yellow micropubescence which becomes thinned over 

 the central portion of the gibbosity, where the shining, 

 black ground color shows. Cheeks shining black and 

 bare; the quite long, slender palpus is black; the very 

 large, quite robust, somewhat compressed proboscis is 

 chiefly shining black, with the lower border on the 

 outer half reddish and marked off by a lateral row of 

 reddish bristles confined to the apex. The proboscis 

 extends far beyond the face ; the dense, copious, brown- 

 ish yellow, coarse, bristly pile of the face extends as 

 far as the proboscis, over the whole of the gibbosity, 

 leaving an apilose, narrow strip beneath the antenna. 

 Pile of front, ocellar tubercle, and the occiput and 

 vertex are brownish yellow and coarse in character, 

 except on the lower half of the occiput where it is long 

 and fine and even more dense. Occiput without 

 bristles. Ocellar tubercle with a broad tuft of 25 or 

 30 long, fine hairs. The antenna blackish with the 

 third segment and the microsegment obscurely reddish 

 brown below. The third segment is a little wider on 

 the outer half than at the base, slightly narrowed at 

 the apex. The microsegment is three or four times as 

 long as wide with black spine at tip. Antennal pile 

 coarse and unusually abundant laterally and ventrally 

 on the third segment and brownish yellow. 



Thorax: The thorax is shining black, with thin, 

 brownish yellow pollen narrowly along the lateral mar- 

 gins and on the humerus and still more thinly on the 

 disc of the thick scutellum. The mesonotum is rather 

 strongly arched both anteriorly and posteriorly and 

 is rather densely covered with long, coarse, undiffer- 

 entiated, brownish yellow pile that is slightly appressed 

 or may be erect on the humerus. Mixed in with the 

 pile posteriorly are a few, long, coarse, black hairs 

 behind the suture. Margin of the scutellum with sev- 

 eral rows of numerous, long, slender, brownish yellow 

 bristles. The posterior half of the disc has long pile 

 of the same color. Notopleuron has 3 moderately 

 stout, brownish yellow bristles, supraalar region with 

 3 or 4 others more slender, and the postalar callosity 

 with at least 10 long, slender, similarly colored bristles. 

 Pleuron largely shining black with scattered tufts of 

 appressed, brownish yellow micropubescence on the 

 upper mesopleuron, its posterior border and the poste- 

 rior hypopleuron. The upper posterior mesopleuron 

 has a patch of abundant, quite fine, brownish yellow 

 pile. Halteres pale brownish yellow with the base dark 

 brown. Lateral callosity of the metanotum with a 

 large patch of brownish yellow, long, fine hairs. Meta- 

 pleuron with a wide, vertical, oval patch of dense, very 

 long, fine, similar hairs. 



