308 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



PAET 1 



inetacoxal area membranous and apilose. Tegula with 

 1 or 2 setae. 



Legs : Hind femur greatly elongate, spindly on the 

 basal third, moderately dilated distally, the middle and 

 anterior femora slender. Pile on the femora and tibiae 

 very scanty and greatly reduced in quantity except on 

 the hind pair, where there is a long, very dense brush 

 of erect or semierect pile which extends dorsally from 

 near the base to the apex. Laterally and ventrally 

 this pile is confined to the distal half; there is dense 

 but much shorter pile medially on the distal half. On 

 the hind femur are present 1 pair of stout, short apical 

 dorsolateral bristles, 1 similar pair of dorsomedial, 

 with a similar apical bristle between. Hind tibia very 

 long, slender basally, gradually but strongly dilated 

 distally, fully as long as the hind femur. This tibia 

 bears sharp, stout, subtuberculate, somewhat oblique 

 bristles: 7 dorsal bristles which are slightly dorso- 

 medial in position, 2 dorsolateral over the middle por- 

 tion, and 2 ventrolateral bristles at the middle and outer 

 third. Ventral brush of setae is developed only at the 

 apex, though there is some pile which becomes abundant 

 in the middle. The medial brush of setae begins just 

 beyond the middle; apex of tibia with 1 medial and 

 3 ventral bristles. Middle femur with 2 bristles pos- 

 teroapically. Its tibia is almost without pile ; on it are 

 a few minute hairs ventrally, fewer above, 1 or 2 pos- 

 teroventral bristles near the apex, and a short ventral, 

 distal brush of setae. The apical, ventral, spinous 

 bristles are well developed and slightly subapical in 

 attachment ; 5 are present. 



Anterior femur with 2 or 3 short bristles antero- 

 dorsally at the apex, its tibia similar to middle tibia in 

 having an anterior brush of setae; on distal half this 

 tibia has 2 or 3 short, posteroventral bristles, and has 

 1 lateral, 1 anterior, and 1 ventral apical bristle. All 

 tarsi slender, especially the basitarsus, which is rather 

 long. Anterior basitarsus as long as the succeeding 

 three segments. Claws sharp, stout basally, gently 

 curved from the base. Pulvilli absent but the empodium 

 stout, bladelike and a little less than half as long as the 

 claw. 



Wings: The wings are elongate and slender, not 

 quite as long as the abdomen. The color is rather 

 dark in the type of genus. Marginal cell open by 

 scarcely more than its maximum width; second sub- 

 marginal cell slightly narrowed on the wing margin; 

 the anterior branch of the third vein ends distinctly 

 behind the apex of the wing; apex of first posterior 

 cell a little widened ; fourth posterior cell slightly nar- 

 rowed; anal cell closed with a long stalk; second basal 

 cell ends on two veins with a long fusion distally. The 

 anterior crossvein enters the discal cell in the middle. 

 Alula absent, its margin fringed. Ambient vein 

 complete. 



Abdomen : The abdomen is elongate, slightly arched, 

 with a tendency to be thrust slightly upward at the 

 base; the posterior segments are strongly compressed 

 laterally; the first segment is quite short, the second 

 unusually elongate ; the third and fourth segments are 



of nearly equal length and the second and third seg- 

 ments are at least subcylindrical. In the male and 

 female eight segments are present and the eighth is 

 four-fifths as long as the seventh. Pile of the abdo- 

 men fine, short, scanty, more or less appressed distally 

 but suberect basally and absent on the basal two-fifths 

 of the second segment. Sides of the first segment 

 with a single, vertical row of 10 moderately long, slen- 

 der, bristly hairs. Male terminalia very short, ex- 

 tended for a short distance dorsally. Female terminalia 

 also extremely short and barely extended beyond the 

 edge of the eighth tergite. 



Distribution : Oriental : phionomima solocifemur 

 Enderlein (1914). 



Genus Lasiocnemus Loew 



Figures 211, 597, 1193, 1202, 1588, 2039, 2043, 2060, 2066, 2068, 



2070 



Lasiocnemus Loew, Bemerkungen fiber die Familie Asiliden, 

 p. 2, 1851. Type of genus: Lasiocnemus ooscuripennis 

 Loew, 1851, by nionotypy. 



Medium size flies and occasionally large. They 

 are characterized by the rather dense, fine pile of the 

 thorax, the strongly swollen hind femur and tibia, with 

 their dense fringes of long, coarse pile. Anal cell 

 closed and stalked; the discal cell ends in one vein. 

 The wings are generally smoky blackish and often with 

 a pattern of paler spots. Length 14 to 20 mm. 



Head, lateral aspect : The head is of medium length. 

 The face is plane with the eye over most of its length 

 and appears as a tiny, short elevation below at the 

 epistoma. The occiput is prominent, especially medially 

 but low and short along the eye margin. It bears long, 

 coarse, rather abundant pile over nearly the whole sur- 

 face except along the eye margin, with bristles absent. 

 The proboscis is short and quite robust, gradually nar- 

 rowed to a blunt point apically. Along its base below it 

 bears a row of 5 or 6 fine, bristly hairs. Palpus with 

 a short, robust, barrel-shaped segment and a distinct 

 trace of a fused basal segment. It bears laterally a 

 few bristly hairs. The antenna is attached at the 

 upper fifth of the head; the first two segments are 

 quite short and beadlike with stiff, long setae below 

 and fine shorter setae above. 



Head, anterior aspect: The head is about 1% times 

 wider than high. The face below the antenna is ex- 

 tremely narrow and less than a fifteenth the head 

 width, becoming strongly divergent below. It is cov- 

 ered with dense, appressed micropubescence with pile 

 absent and a single row of comparatively slender, 

 moderately long bristles along the epistomal margin. 

 This row generally contains 10 pairs. The lateral and 

 lower elements are shorter and fine. Front small, the 

 sides expanded above, the surface micropubescent, with- 

 out pile. Vertex but little excavated, the ocellarium 

 fills most of the space between the eyes and has vertical 

 sides. It is generally pollinose only. 



