TACHINIDAE OF ORIENTAL REGION 27 



- Arista very long and slender, thickened on much less than its basal half and with 



non-elongate basal segments. Abdomen seen directly from above usually appearing 

 obviously quadrisegmented, without a heavy elongate postabdomen recurved under 

 the preabdomen except in some $ Lophosia ....... 4 



4 Abdominal tergites without median discal setae (one undescribed species seen with a 



pair on Ti +2). Hind tibia with a pv apical seta (sometimes small). Vibrissae 

 very strong and crossed. Posteroventral declivity of the thorax completely 

 sclerotized. Abdomen with sternites 2-4 completely hidden in both sexes. <$ 

 sternite 5 with lateral lobes formed into a pair of long bare shining processes (usually 

 slender and bent downwards but sometimes straight and blade-like, Text-figs 124- 

 128). $ postabdomen usually terminating in a pair of juxtaposed or separated 

 hook-like claspers (seen laterally as Text-figs 129-135) . LOPHOSIA Meigen 



- Abdominal T3 and T4 (sometimes also T5) each with a pair of erect median discal 



setae. Hind tibia without pv apical seta. Vibrissae very weak or hair-like (except 

 in Penthosiosoma). Posteroventral declivity of the thorax usually membranous 

 medially. Abdomen with sternites 2-4 partially exposed in <J (ventral ends of 

 tergites not meeting) and hidden in $. $ sternite 5 without such modified lateral 

 lobes. $ postabdomen without such claspers ...... 5 



5 Vibrissae strong and crossed. Hind tibia with 3-4 ad and 3-4 pd setae. Postero- 



ventral declivity of the thorax completely sclerotized. Parafacial very narrow, 

 about a quarter as wide as antenna. Antennae of medium length, third segment 

 about 2-1-2-9 times as long as second segment and not constricted medially. 

 Lower calypter small, flat and subcircular (only about twice as long as upper 

 calypter) . Wings brown anterobasally and smoky apically, the dark areas separated 

 by a broad whitish or creamy yellowish cross-band. Mid and hind coxae of <J with 

 unusually long dense tufts of crinkly black hair PENTHOSIOSOMA Townsend 



- Vibrissae hair-like or weakly setiform, not crossing. Hind tibia with not more than two 



ad and two pd setae. Posteroventral declivity of the thorax membranous medially, 

 or if almost fully sclerotized then with a conspicuous median suture. Parafacial 

 subequal in width to antenna. Antennae very long, third segment 4-5-7-0 times as 

 long as second segment and obviously narrowing medially or submedially seen in 

 profile (Text-fig. 25). Lower calypter at least slightly elongate and slightly to 

 conspicuously convex dorsally, more than twice as long as upper calypter. Wings 

 not so patterned, either almost uniformly very dark brown or yellowish to brown 

 on most of the anterior half. Mid and hind coxae usually without such ab- 

 normally dense hair tufts .......... 6 



6 Abdomen clavate (Text-fig. 120). Vespid mimic, £ abdomen orange on the basal 



'waist' and velvety black-brown on the remainder (evidently a mimic of Ropalidia 

 binghami Vecht) FORMICOPHANIA Townsend 



[This genus is so close to Hermya that it probably ought not to be accorded 



separate generic status.] 



- Abdomen subfusiform (Text-fig. 123). Non-mimetic (or at least not obviously 



mimetic) forms with abdominal ground colour black or bluish black in both sexes 

 [one $ specimen of an undescribed species seen from Burma in which T5 and large 

 markings on T3 and T4 bright reddish orange.] . HERMYA Robineau-Desvoidy 



As it has been necessary to see so many of the types of the various species of 

 Cylindromyia and Lophosia, in order to interpret correctly the many generic names 

 that fall as synonyms, it has been possible to construct preliminary keys to the 

 Oriental species of these genera as they are here recognized. The keys are given 

 below and include several undescribed, or apparently undescribed, species that 

 are represented in the BMNH collection. 



