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UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



bristles on the hind tibia, and 2 or 3 similar posteroven- 

 tral and anteroventral bristly hairs. Also a small 

 bristle on the hind femur dorsally and another laterally 

 at the outer sixth. Three ventral, minute tubercles on 

 hind femur have stubby, minute bristles. Claws quite 

 slender, sharp ; the pulvilli slender but long ; the empo- 

 dium short and a little swollen basally. 



Wings: The base of the wing is broad, the apex 

 more narrow, the marginal cell is widely open, with 

 the second vein, which is barely curved, at apex; the 

 anterior branch of the third vein is strongly arched at 

 the base and the second submarginal cell strongly 

 flared apically. The first posterior cell is widely open, 

 the fourth posterior cell and the anal cell each closed 

 with short stalks; the alula large, lengthened dis- 

 tally; the ambient vein complete; all veins pale, yel- 

 lowish white. 



Abdomen: The abdomen is exceptionally robust, as 

 wide as the thorax, comparatively flattened over the 

 middles of the tergites, the sides parallel to the end of 

 the fourth segment. The first segment is almost as long 

 as the second, all the segments pollinose on the basal 

 half, and the whole lateral margin and the sixth segment 

 pollinose throughout. Pile of abdomen microscopically 

 minute, appressed, fine setate, including the lateral mar- 

 gin. Sides of first tergite with 4 pairs of short, weak 

 bristles and 1 or 2 minute, weak bristles in the middle of 

 the lateral margin of the second to fifth segments. Pile 

 of the sternites more scanty but equally short. Female 

 with 6 tergites, the seventh deeply concealed beneath the 

 long, basilaterally curled sixth tergite. Female termi- 

 nalia minute, consisting of a short, lappetlike, ninth 

 tergite divided by a medial crease and the whole struc- 

 ture turned forward. 



Distribution : Palaearctic : Torebroma gymnops Hull, 

 1957. 



Genus Bohartia Hull 



Figures 56, 419, 860, 869, 1673, 1681, 1995 



Bohartia Hull, Rev. Brasileira Biol., vol. 18, no. 3, p. 317, 1958. 

 Type of genus : Bohartia oromleyi Hull, 1958, by original 

 designation. 



These are small but robust flies with dense, fine, short, 

 appressed, mesonotal pile; all cells of the wing open. 

 Flies of blackish color and with a low gibbosity on the 

 lower half of the face. Related to Gerrolasius Hermann. 

 These flies are aberrant members of the Laphystini and 

 have in males a short, seventh tergite present. They 

 have all other characters of this tribe. All femora are 

 distinctly swollen, the scutellum bears slender bristles 

 and there is a pronounced, transverse, subbasal groove 

 on the second tergite, which in other members of the 

 group lies on the basal margin itself. Bristles restricted 

 to the first tergite and weak. Length 7 to 8 mm. 



Head, lateral aspect: The head of medium length, 

 the face quite short above, very slightly concave in 

 the middle and with a low rounded gibbosity on the 



lower half; it is conspicuous chiefly because of the 

 recession of the eye. The occiput is short and of nearly 

 uniform extent above and below, its pile comparatively 

 sparse and fine, with bristles beginning at the middle 

 of the head and only moderately stout dorsally. The 

 proboscis extends a little beyond the face, is directed 

 obliquely forward, blunt at the apex, cylindrical, and 

 only slightly swollen at the base. Palpus minute, com- 

 posed of two segments, the second being quite short 

 and the first segment apparently excavated. The an- 

 tenna is attached a little above the middle of the head, 

 moderately elongate and not longer than the head; the 

 first and second segments of equal length and both 

 with several long, slender, bristly hairs, more stout 

 on the second segment. The third segment is slender, 

 slightly narrowed at base and apex and a little longer 

 than the combined length of the first two. It bears 

 a distinct truncate microsegment which is a little longer 

 than wide and carries a spine at the apex. 



Head, anterior aspect: The head is about iy» times 

 as wide as high, the face below the antenna is one- 

 fifth the head width and very slightly divergent below. 

 The face is coarsely pubescent and bears only 3 or 4 

 long, fine hairs laterally on the upper half; on the 

 gibbous portion below are numerous slender bristles 

 and bristly hairs extending a little beyond the apex 

 of the proboscis. Of these a transverse row of 6 lo- 

 cated on the dorsal border of the gibbous portion of the 

 face are stouter. The subepistomal area is almost hori- 

 zontal. Front distinctly divergent, as wide or wider 

 than the lower face and again convergent at the vertex. 

 The front is sunken, pollinose, with a subocular row 

 of 3 long and 3 shorter bristles and submedially on 

 each side, a group of 4 or 5 fine, erect hairs. The ver- 

 tex is but little excavated in contrast to Laphystia 

 Loew; its sides are slanting, the ocellarium high and 

 placed opposite each posterior eye corner. The pos- 

 terior vertex is not greatly excavated; the ocellarium 

 bears 3 conspicuous, long, slender bristles between the 

 posterior ocelli. 



Thorax : The mesonotum is low, pollinose and densely 

 fine appressed pilose; pile undifferentiated except for 

 2 or 3 fine, long bristles on each side in front of the 

 scutellum. Humerus with slightly longer pile anteri- 

 orly. The lateral bristles are weak, not very stout 

 or long. The complement of bristles consists of: 1 or 

 2 notopleuron, 1 supraalar, 1 postalar, 1 suprapostalar, 

 and 3 or 4 pairs of weak scutellar bristles. Propleuron 

 with only fine pile ; most of the mesopleuron, the stemo- 

 pleuron, pteropleuron, hypopleuron polished, shining, 

 bare and pitch black; the upper border of the meso- 

 pleuron, upper posterior corner of the sternopleuron, 

 and upper posterior corner of hypopleuron and the 

 metapleuron all bear fine micropubescence, and there 

 is a row of scanty, fine hair along the posterior border 

 of the mesopleuron and upper posterior margin of the 

 sternopleuron. The metapleuron bears a vertical row 

 of 5 exceptionally slender bristles and some hairs. 



