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UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



The proboscis is comparatively long but very stout 

 basally; it bears a low medial ridge and is strongly 

 tapered to a rounded point. Palpus with two seg- 

 ments, cylindrical, with dense, long, rather slender pile. 

 The antenna is unusually long and slender, the three 

 segments of equal thickness throughout; the apex of 

 the third segment dorsoventrally bears a thinned, 

 apical, scooplike extension with a stout spur, which 

 in turn has an apical, short, slender spine. The dorsal, 

 ventral and lateral margins of the first segment have 

 numerous long, black bristly hairs. The second seg- 

 ment has shorter appressed black hairs; these are nu- 

 merous above and a few laterally, none ventrally. 

 The first segment is 1^ times as long as the second, 

 the third segment nearly three times as long as the 

 first segment. 



Head, anterior aspect: The face is wide, slightly 

 divergent below, with very numerous long, stiff hairs 

 or weak bristles; on the upper portion these bristles 

 extend forward but are slightly curved; on the lower 

 part, they are directed obliquely downward. On the 

 sides of the front are 7 or 8 quite long, slender black 

 hairs. Vertex not at all excavated. The ocellar pro- 

 tuberance is very low and bears several long, slender 

 hairs. 



Thorax : The thorax is moderately elevated and con- 

 vex, abrupt anteriorly, and the hump-backed appear- 

 ance is greatly accentuated by the head, with its 

 short neck, set low upon the prothorax and directed 

 somewhat downward; in its strong hump-backed ap- 

 pearance it much resembles the bombyliid Eclimus 

 Loew. Mesonotum everywhere covered with abundant, 

 fine, long, nearly erect pile ; the humerus is pilose. On 

 the mesonotum are weak, rather long, pale bristles, 

 7 notopleural, 10 supraalar, 10 postalar, and 40 pre- 

 scutellar, 20 on each side and forming a wide band. The 

 scutellar margin has 24 slender bristles; the disc is 

 flattened and not pilose. Mesopleuron with 6 bristles 

 and with additional, equally long, fine pile and with 

 fine pile on the middle posterior border. Propleuron 

 pilose, hypopleuron pilose dorsally, metapleuron with 

 a broad band of numerous, long, pale hairs and weak 

 yellow bristles. Slopes of metanotum without pile. 

 Lateral metasternum with long, appressed pile; post- 

 metacoxal area short and membranous. 



Legs: The hind femur is only slightly elongate, 

 moderately stout, with rather long, flat appressed pile 

 dorsally and laterally and long, erect pile below in 

 which there is a vertical, medial fringe of still longer, 

 delicate hairs. The hind femur has a row of 5 mod- 

 erately long, stiff, yellow, lateral bristles and a group of 

 3 dorsolateral elements at the apex, with 1 dorsomedial 

 apical bristle. The hind tibia has similar pile but with- 

 out long ventral hairs; its bristles are stout, pale, ob- 

 lique, curved and consist of 5 dorsolateral, 4 dorsal, 

 and 4 ventrolateral on the outer half; apex with 2 

 dorsal, 2 medial, 1 lateral, and 3 ventral bristles. 

 Posterior basitarsus short, about as long as the next 

 two segments; second to fourth segments beadlike and 

 triangular. The middle femur has 4 weak, posterior 



bristles on the apical half, 3 anterior bristles at the 

 apex; middle tibia with 6 long anterior, 6 dorsal, and 

 4 posterior bristles. Apex with 2 dorsal, 2 posterior, 

 2 anterior, and 2 ventral bristles. The anterior femur 

 has short bristles at apex, 2 posterodorsal, 2 antero- 

 dorsal, and rather long, fine pile in front and behind. 

 The anterior tibia has 5 anterodorsal, 5 posterodorsal, 

 and 5 rather long posterior bristles; apex with 2 dor- 

 sal, 2 anterior, 2 ventral, and 2 posterior bristles; the 

 anterior tibia without apical spine. Claws divergent, 

 moderately long, sharply bent towards the apex and 

 sharply pointed; pulvilli large, rectangular, nearly as 

 long as the claw with bent nonribbed pad; empodium 

 slender, half as long as the claw. 



Wings: The marginal cell is widely open, the first 

 vein tends to be arched at the apex. The anterior 

 branch of the third vein has a distinct spur vein near 

 its base. Fourth posterior cell narrowed to half, anal 

 cell closed in the margin, second basal cell ends with 

 three veins; alula rather narrow, the ambient vein 

 complete. 



Abdomen: The abdomen is stout but elongate, sub- 

 cylindrical and slightly wider than thorax, and slightly 

 shorter than the wings, but slightly tapering so that 

 at the apex it is only a little narrowed. First tergite 

 of the same width as abdomen, its sides with a vertical 

 row of long, stiff, backwardly directed pile, among 

 whicli are 7 or 8 weak bristles. The lateral third of the 

 second tergite bears rather long, somewhat silky pile 

 directed backward. Succeeding tergites with much 

 shorter similar pile ; dorsal pile short and subappressed. 

 There are 6 well developed dorsal tergites; the seventh 

 and eighth are quite short; in the male the eighth 

 tergite is also visible but short. Sternites with long, 

 bushy pile. Male terminalia conspicuous but not very 

 long. Superior forceps well developed and gonopod 

 large; aedeagus tubular. The gonopod appears to be 

 fused basally below, the hypandrium absent or greatly 

 reduced, or possibly fused with the gonopod. 



Distribution: Palaearctic: Hystrichopogon hirticeps 

 Hermann (1905). 



Genus Eucyrtopogon Curran 



Figures 92, 583, 968, 977 



Eucyrtopogon Curran, Canadian Ent., vol. 55, p. 95, 1923. Type 

 of genus : Cyrtopogon nehulo Osten Sacken, 1877, by original 

 designation, as Crytopogon, lapsus. 



Small to medium size flies, the crossvein and the fork 

 of the third vein and middle of wing with small spots. 

 The fork of the third vein lies opposite or slightly 

 beyond the posterior crossvein or end of the discal cell ; 

 the anterior crossvein enters the discal cell at the middle 

 or more often near the outer third of the discal cell. 

 Very similar in general appearance to Comantella Cur- 

 ran, the mesonotum is usually without mane and the 

 protibial apex never with a distinct spine. Mesonotum 

 not compressed. In the males of a few species there 

 may be a long, medial, loosely concentrated mane of 



