18 R. W. CROSSKEY 



M often forming an open very evenly rounded curve (as Text-figs 85-87). Head 

 without proclinate orbital setae ...... PHASIINI (p. 18) 



- Abdomen with some clearly differentiated setae in addition to the hairing (except in 



Pseudobrullaea). Abdominal sternites 2-4 concealed or only partially exposed 

 (usually completely hidden by ventral ends of the tergites in both sexes, sometimes 

 hidden in $ but just visible between non-contiguous ventral ends of tergites in q"), 

 abdominal shape usually strongly elongate subfusiform, subcylindrical or clavate. 

 Usually three post dc setae, sometimes four, of which at least one stands on the 

 anterior half of the scutum. Either one or two post ia setae (usually two) . Pre-alar 

 and second sa setae usually either or both present (both absent in a few forms). 

 Lower calypter of varied shape but usually strongly rounded on posterior margin. 

 Femora always without ventral spine-combs. Posteroventral declivity of the 

 thorax either membranous or sclerotized medially (most often sclerotized), 

 abdominal base and metacoxae usually well separated. Bend of vein M moderately 

 strongly and sharply curved to very sharply angulate, never forming an even 

 circularly-rounded curve (e.g. as Text-fig. 88). Head often with proclinate orbital 

 setae .............. 3 



3 Abdominal base and the hind coxae conspicuously widely separated and the postero- 

 ventral declivity of the thorax fully sclerotized or partially membranous (usually 

 forming a completely sclerotized bridge, but not in Hermya-comp\ex) . Abdomen 

 very elongate, subcylindrical, subfusiform, or clavate (Text-figs 1 19-123). Lower 

 calypter evenly rounded on its hind margin and usually longer than broad. Head 

 with broad frons of equal width in both sexes, often with proclinate orbital setae 

 in both sexes of the same species. One or two post ia setae. Apex of $ abdomen 

 without horizontal forcipate processes, but often with recurved hook-like processes 

 (Text-figs 129-135). Palpi present or absent. Scutellum with two or three pairs 

 of marginal setae CYLINDROMYIINI (p. 22) 



- Abdominal base and hind coxae normally approximated and the posteroventral 



declivity of the thorax widely membranous medially. Abdomen subovate or if 

 obviously elongate (Pseudobrullaea) then widest near base and tapering on apical 

 half. Lower calypter very large and slightly subtriangular (opaque white and 

 larger in q* than $). Head with q" frons much narrower than $ frons and with 

 proclinate orbital setae in $ but not in q*. Two very strong post ia setae. Apex of 

 $ abdomen with a pair of horizontal forcipate processes (Text-figs m & 113). 

 Palpi present. Scutellum with three or four pairs of marginal setae 



LEUCOSTOMATINI (p. 33) 



Tribe PHASIINI 



The principal adult characters of the Phasiini are cited in the foregoing key to 

 tribes and this should suffice for recognition of the group. In an earlier work 

 (Crosskey, 1973& : 34) I provided a preliminary diagnosis of the tribe as a whole, 

 and this is very largely applicable to the Oriental fauna (but not completely so 

 because it excluded from consideration the Trichopodini and Gymnosomatini which 

 I now believe cannot justifiably be treated as separate valid tribes). 



The Phasiini are represented in the Oriental Region by eight recognized genera 

 and some two dozen species, but the fauna seems to be specifically richer in the 

 northerly parts of the region (bordering the Palaearctic Region) than in the south- 

 east Asian tropics; in the latter area the Cylindromyiini are the predominant element 

 in the phasiine fauna as a whole. Three of the eight genera, Alophorophasia Town- 

 send, Compsoptesis Villeneuve and Perigymnosoma Villeneuve, are endemic genera 



