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UNITED STATES NATIONAL MUSEUM BULLETIN 224 



with fine setae on the disc and rim. There is some 

 scanty appressed pile on the upper and posterior half of 

 the mesopleuron ; propleuron pilose, the pronotal collar 

 with fine pile only ; metapleuron with a broad band of 

 long, stiff pile; hypopleuron without pile but with a 

 patch of pubescence. Upper pteropleuron with some 

 fine short pile ; lateral slopes of the metasternum pilose ; 

 metanotal callosity micropubescent only ; ventral meta- 

 sternum chitinized with a few hairs; postmetacoxal 

 area membranous ; prosternum not dissociated. 



Legs : The femora stout, the hind pair a little dilated 

 distally; the legs everywhere covered with fine, ap- 

 pressed setae; the bristles are quite short but stout. 

 On the hind femora are 6 to 8 ventrolateral bristles, a 

 few long bristly hairs ventrally at the base, and 2 dor- 

 somedial bristles near the apex. Middle femur with a 

 stout bristle posterodorsally at apex, another antero- 

 dorsally, yet another anteroventrally. Anterior femur 

 with on each side a small dorsal bristle near the apex. 

 Hind tibia with 3 dorsal bristles and 3 ventrolateral 

 bristles, its apex with 6 large and 2 minute bristles. 

 Anterior and middle tibia small, rather short and 

 slender, with 3 or 4 small, posterodorsal, 3 anterodorsal, 

 and, on the middle tibia, 2 posteroventral bristles. 

 Claws sharp, the posterior pair more strongly curved, 

 the pulvilli long, the empodium long and slender, a 

 little swollen at the base. 



Wings : The marginal cell is widely open, the second 

 vein not recurrent; base of second submarginal cell 

 with a low arch. The first posterior and fourth pos- 

 terior and anal cells closed with a short stalk. The 

 upper and lower end veins of the second basal cell 

 crossed. The alula is large, the anterior crossvein rec- 

 tangular, entering the discal cell at the middle; the 

 lower end vein of the discal cell is long and the ambient 

 vein ends at the anal cell. 



Abdomen: The abdomen is robust and rather flat- 

 tened, as wide as the thorax, with parallel sides to the 

 end of the fifth segment and with dense, minute, flat 

 appressed pile. The first tergite has 3 or 4 bristles 

 laterally, 1 or 2 on the sides of the second to the fourth 

 tergites and 1 laterally on the sides of the fifth and 

 sixth tergites. Males with 6 tergites; females with 8, 

 the seventh and eighth both quite short and each about 

 one-fourth the length of the sixth. Male terminalia 

 rotate one-fourth, open below. The epandrium is not 

 large, is broad at base, a little convex, and with a deeply 

 rounded, medial sulcus, each half thin and flat, curved 

 laterally downward. Gonopod broad, short, obtuse 

 and convex. Hypandrium also short, leaving the 

 genital cavity widely open. Female terminalia short, 

 protruding only a little beyond the eighth tergite. 



Distribution : Palaearctic : Perasis maurus Macquart 

 (1849); ocettatus Becker (1923); postica Becker 

 (1907); sareptana Hermann (1905); tmnscaspica Pa- 

 ramonov (1930) ; violacea Becker (1907). 



Genus Udenopogon Becker 

 Figures 2507, 2517, 2523 



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

 Imp. Sci. St. Petersbourg, vol. 17, p. 520, 1913. Type of 

 genus : Udenopogon inscriptus Becker, 1913, by monotypy. 



The following is Becker's description in translation : 



The head flat, large, and seen from the front almost twice as 

 broad as high; much broader than the thorax. Face in profile 

 not protruded ; front and face equally broad, hardly broader 

 than one half eye. The mystax is limited to the lowest border 

 (aussersten Mundrand) of the mouth and is very delicate; on 

 the lower face, uniformly distributed, there are a few delicate 

 hairs. On the top of the head the deep, saddle-like front is 

 wholly bare. The antennae have almost the form of Babro- 

 pogon; the third antennal segment is a little broadened, as long 

 as the first and second segments together, with a short, cone-like 

 style that has a quite indefinite, obscure basal joint, and which 

 reaches one-third the length of the third segment, without spe- 

 cial terminal bristle. Thorax arched, with short, soft, uniformly 

 distributed hair, a little longer behind, the surface gray dusted 

 with blackish pattern. Abdomen with 7 segments exclusive of 

 hypopygium, short, somewhat arched, densely gray pollinose 

 with large, black spots and short pile. 



Legs shining reddish yellow, quite slender, except, however, 

 the hind tibiae are strongly curved and on the underside of the 

 hind femora there are some tuberculate bristles. The meta- 

 tarsi are short but nevertheless twice as long as the middle 

 segment. Wings with closed and stalked fourth posterior cell. 

 Note: This genus reminds one somewhat of Hoplistomerus 

 Macquart because of the structure of the hind femur, but also 

 because of the genuine Dasypogonine ending of the second longi- 

 tudinal vein in the wing margin before the end of the first 

 longitudinal vein and the open first posterior cell, as well as the 

 closed fourth posterior cell, and finally, the structure of the hind 

 tibiae are all substantially differing characteristics of our genus. 



Distribution: Palaearctic. Udenopogon inscriptus 

 Becker ( 1913) . From Iran. 



Genus Hoplistomerus Macquart 



Figures 87, 437, 880, 889, 1977, 2103, 2100 



Hoplistomerus Macquart, Dipteres exotiques, vol. 1, pt. 2, p. 59, 

 1838. Type of genus : Laphria serripes Fabricius, 1805, by 

 monotypy. 



Hoplistomera Walker, List . . . dipterous insects . . . British 

 Museum, suppl. 3, p. 509, 1855, lapsus. 



These flies are of medium size. Characterized by 

 the stout, robust abdomen with numerous tergal bristles, 

 the dense, appressed, setate pile of the abdomen and 

 thorax. The hind femur is massively thickened as in 

 Triclioscelis Boeder, but has true spinous protuberances 

 and the apex of the marginal cell is bulbous. The 

 veins that end the fourth posterior cell and lower part 

 of the discal cell are aligned in a straight row. Length 

 15 mm. 



Head, lateral aspect: The head is long, its length 

 three-fourths the height. The face is well developed 

 and prominent throughout, its anterior profile plane, 

 the eye only slightly recessive anteriorly below. The 

 occiput is moderately developed in the middle of the 

 head, more prominent below, but obliterated near the 

 vertex. Pile of occiput abundant, long and fine below 



