92 R. W. CROSSKEY 



Key to Oriental Genera of LESKI1NI 

 i Wing with cell R b open or just closed in the wing margin ..... 2 



- Wing with cell i? 5 closed and long-petiolate (petiole almost as long as m-cu) 



ISTOGLOSSA Rondani 



2 Eyes haired ............. 3 



- Eyes bare ............. 6 



3 Scutellum with three pairs of very strong marginal setae (large crossed apicals 



present that are almost as strong as the basals) ; subapical scutellar setae very 

 widely separated, distance between their bases much greater than that between 

 a subapical seta and its corresponding basal seta. Abdominal T3 and T4 without 

 discal setae. Basicosta blackish brown ....... 4 



- Scutellum with two pairs of strong marginal setae (apical setae absent or very small 



and fine) ; subapical scutellar setae not very widely separated, distance between 

 their bases not greater than that between a subapical seta and its corresponding 

 basal seta. Abdominal T3 and T4 with discal setae (one haphazardly missing on 

 either tergite in occasional specimens). Basicosta yellow . .... 5 



4 2 + 3 dc setae. Abdominal T3 with a pair of very strong erect median marginal 



setae. Abdominal Ti + 2 not excavate to its hind margin. Tegula blackish 

 brown (not contrasting in colour with basicosta). Wing of $ with one long setula 

 on upper surface of the node and with a series of very long strong hairs on the 

 lower surface of J t ? 4+S that extends about half way towards r-m 



TRICHOFORMOSOMYIA Baranov 



- 3 + 3 dc setae. Abdominal T3 without median marginal setae. Abdominal Ti + 2 



excavate to its hind margin. Tegula yellow (contrasting strongly with the dark 

 basicosta). Wing of $ with several minute hairs on each surface of the basal 

 nodeof/? 4+5 DEMO TICOIDES Mesnil 



5 Two post ia setae. Legs exceptionally long and slender, hind tibia sinuous in both 



sexes; $ hind femur with a row of 3-5 very long pd setae. Antennal axis at or 

 below mid-eye level. Proboscis short, mentum not as long as head height 



DEXIOMIMOPS Townsend 



- Three post ia setae. Legs not exceptionally long and tibiae not sinuous; o* hind 



femur without pd setae. Antennal axis conspicuously above mid-eye level. 

 Proboscis rather long and fine (Text-fig. 46), mentum conspicuously longer than 

 head height FERIOLA Mesnil 



6 Mid tibia with one ad seta (rarely none at all in $). Wing vein /? 4+5 with setulae 



confined to the basal node (except Clausicella) ...... 7 



- Mid tibia with two or more strong ad setae. Wing vein R i+ 5 with setulae extending 



well beyond the node and usually reaching or surpassing r-m . . . . 11 



7 Four stpl setae. Arista strongly thickened on about two-thirds of its length and 



with the second segment elongate (about three times as long as wide). 2 -f- 3 dc 

 setae. Palpi strongly clubbed ..... CLA USICELLA Rondani 



- Three stpl setae. Arista only with the usual slight thickening near the base and 



with the second segment not or hardly at all elongate. 2 -f- 3 or 3 + 3 dc setae. 



Palpi not clubbed ........... 8 



8 Abdominal T3 without median marginal setae ....... 9 



- Abdominal T3 with a pair of very strong erect median marginal setae . . 10 



9 Abdominal Ti 4- 2 not excavate to its hind margin. Antennal axis at or just below 



mid-eye level, antennae not very large (length not exceeding maximum breadth 

 of the eye). Peristomal setae undifferentiated (represented by small fine hairs). 

 Frons of q* narrow, width of vertex less than half that of one eye seen from above. 

 Epistome very weakly projecting in front of the vibrissal insertions (Text-fig. 45). 

 o* with exceptionally long narrow wings, very long slender legs, and long narrow 

 abdomen [9 unknown]. Arista with obvious long pubescence (most hairs of upper 

 surface longer than basal thickness of arista) . . MYOBIOMIMA Townsend 



