ISO 



HOTTED STATES NATIONAL MUSEUM BULLETIN 224 



PAET 1 



panded until on the outer third it is distinctly wider 

 than the basal portion ; this segment is at least twice 

 as long as the combined length of the first two segments 

 and bears at its apex a long, slender, finely attenuate 

 style. There is no basal microsegment present, 



Head, anterior aspect: The head does not descend 

 beneath the eye. Face below the antenna less than 

 one-third the head width and divergent below. The 

 front is expanded and the width at vertex is two-fifths 

 the head width. Subepistomal area of medium size, 

 nearly horizontal, pubescent, concave, but short. Face 

 thinly pubescent along the sides, more or less bare in 

 the middle and densely covered from antenna to the 

 epistoma with matted, long, fine, bristly hair which 

 tends to be curled downward, leaves a portion of the 

 lateral margin dorsally apilose but ventrally extending 

 gradually to the margin. Front short, bare, with a 

 minute line of pubescence along the eye and with a 

 dense tuft of long, bandlike, slender pile set more or 

 less obliquely on the lateral third. Vertex moderately 

 excavated, very wide, due to the expanding front with 

 the slopes of the vertex low; the ocellarium is large, 

 of moderate height, the ocelli large and bearing between 

 the ocelli 10 to 14 long, fine hairs. Sides of vertex 

 with similar pile which is nearly as long as the antenna. 

 Anterior eye facets strongly enlarged. 



Thorax : The thorax is mostly shining, with patches 

 of exceedingly fine pollenlike pubescence on the mes- 

 opleuron, pteropleuron, the lower sternopleuron, and 

 above the wing. The mesonotum is rather high, equally 

 convex and abrupt anteriorly and posteriorly. Pile of 

 mesonotum exceptionally dense, long, and fine but not 

 obscuring the ground color. It is perhaps more dense 

 on the medial third with a narrow parting between the 

 middle. Dorsocentral bristles not differentiated. Hu- 

 merus apparently without pile or at most with 1 or 2 

 hairs although the surrounding areas are copiously 

 pilose. The following long, stout, microtuberculate 

 bristles are present laterally : 3 notopleural, 3 or 4 su- 

 praalar, 4 or more postalar bristles; the whole surface 

 of the scutellum very densely covered, except in the ex- 

 treme lateral corners, with remarkably long, fine, bristly 

 pile: the basal elements interlacing with the similar pile 

 on the prescutellar area. Postalar region with other 

 long bristly hairs besides the bristles. Propleuron with 

 numerous, long, fine hairs and no bristles. Upper pos- 

 terodorsal half of the mesopleuron with a large patch of 

 long, fine pile. Anterior and dorsomedial sternopleu- 

 ron and the hypopleuron with a patch of numerous, long 

 hairs. Metapleuron convex with a large, oval band of 

 numerous, long, bristly hairs. Lateral slopes of the 

 metanotum pubescent only, medial metanotum bare, 

 lateral metasternum with long pile posteriorly, similar 

 abundant pile on the narrow, convex, arched and chiti- 

 nized ventral metasternum. Postmetacoxal area mem- 

 branous ; tegula with some setae. 



Legs: The legs are stout without being swollen; the 

 anterior and middle legs of nearly equal length, the 

 hind leg a little longer. All of the femora bear dense, 

 shaggy, long, fine, somewhat matted pile; tibial pile 



shorter but longer than usual. Femora with few 

 bristles; on the middle femur are 3 moderately stout, 

 short posterolateral and subapical bristles, 1 additional 

 bristle near the middle, and a pair of dorsal bristles 

 nearer the apex; also 1 anterodorsal subapical bristle. 

 On the hind femur are 6 well developed lateral bristles. 

 On the tibiae the bristles are better developed. The 

 hind tibia has 4 long and 4 short posteromedial, 4 long 

 posterolateral bristles. Middle tibia with 6 long and 

 conspicuous anterodorsal, and with some long posterior 

 bristly hairs. Anterior tibia with 7 or 8 posterodorsal, 

 5 or 6 shorter anterodorsal and 4 or 5 posterior bristles. 

 Apex without spine. Tarsi end in sharp, strongly 

 arched claws, long pulvilli and short, basally swollen 

 empodium. 



Wings: The marginal cell is widely open, subcostal 

 cell reduced distally ; all the posterior cells widely open, 

 anal cell closed with a short stalk; second basal cell ends 

 in 3 veins, the middle vein quite short; alula not as wide 

 as the costal cell, costal cell rather expanded on the 

 basal half. Ambient vein complete. The anterior cross- 

 vein enters the discal cell at the middle. Wings hyaline 

 and not villose. 



Abdomen: The abdomen is rather strongly com- 

 pressed laterally, comparatively short, nearly or quite 

 as wide at the base of the first tergite as the mesonotum. 

 Female with eight tergites, eighth tergite slanted down- 

 ward, a little shorter than the seventh, which in turn is 

 a little shorter than the sixth. The pile of the abdomen 

 is fine, but comparatively short dorsally; ventrolater- 

 al^ it becomes very long and fine, and on the sternites 

 becomes like tufts of cotton fiber. Female terminalia 

 with 4 or 5 pairs of short, spatulate, spoonlike spines 

 on either side. Laterally below these spines there are 

 some slender, quite fine, bristly hairs. Last sternite 

 short and poorly developed, recessive. 



Distribution : Palaearctic : Eriopogon jxibatus Becker 

 (1906) ; laniger Meigen (1804). 



Genus Jothopogon Becker 



Figubes 72, 498, 1009, 1010, 1719, 1946 



Jothopogon Becker, in Becker and Stein, Ann. Mus. Zool. Acad. 

 Imp. Sci. St. Petersbourg, voL 17, p. 518, 1913. Type of 

 genus : Cyrtopogon leucomallus Loew, 1870, by original 

 designation. 



Small, densely white pilose flies. Belated to Erio- 

 pogon Loew. They are distinguished by the cylindrical 

 abdomen, the larger form of the male terminalia and 

 the absence of the conical process on the hind coxa 

 which is found in Eriopogon. Length 8 to 11 mm. 



Head, lateral aspect : Face evenly convex and 

 rounded and only slightly produced forward in profile. 

 Occiput moderately developed except near vertex 

 where it is obliterated. Pile of occiput quite long, 

 dense and white and fine ; at the vertex there are 10 to 

 12 moderately long hairs which are stifler than those 

 of the face. The proboscis is short, directed forward, 

 cylindrical, bluntly pointed and has a conspicuous, 



