TACHINIDAE OF ORIENTAL REGION 41 



- Eyes haired. Scutellum with two pairs of marginal setae (basals and apicals) 



KAMBAITIMYIA Mesnil 

 2 Scutellum with three pairs of marginal setae (laterals present in addition to basals 



and apicals) CHETOPTILIA Rondani 



- Scutellum with two pairs of marginal setae (basals and apicals) 



ANTHOMYIOPSIS Townsend 



Key to Oriental Species of CHETOPTILIA Rondani 



Arista plumose. Abdominal T3 with median marginal setae. Wing with w-cu 

 almost straight and much shorter than the section of M from m-cu to the bend. 

 <J with facets of upper halves of eyes much enlarged . angustifrons Mesnil 



Arista pubescent. Abdominal T3 without median marginal setae. Wing with m-CU 

 sigmoid and subequal in length to the section of .1/ from m-cu to the bend, g eyes 

 with facets of uniform small size ...... burmanica Baranov 



Tribe IMITOMYIINI 



This little-studied group contains fewer than a dozen species, but is known 

 from the Palaearctic, Nearctic, and Ethiopian Regions, and from the northern 

 borders of the Oriental Region. The tribal facies is very distinctive because of 

 the heavy facial carina, but the affinities are obscure and the hosts appear to be 

 unrecorded. Assignment to Dufouriinae appears to be at least as appropriate as 

 any other placement for present purposes, but it is possible that the Imitomyiini 

 represent a highly modified derivative from the Prosenini and probable that they 

 have coleopterous hosts. 



Only two species are known from the area covered by the present work, Riedelia 

 bicolor Mesnil from China and Proriedelia petiolata Mesnil from northern Burma. 

 These species are the type-species (and only known species) of the genera Riedelia 

 Mesnil and Proriedelia Mesnil respectively, and very few specimens are known: 

 R. bicolor is known only from the holotype {$) and from three specimens (1 £, 2 $) 

 from Shanghai found standing among the unnamed Tachinidae in BMNH collection 

 when this paper was prepared, and P. petiolata is known only from the $ (not $) 

 holotype. The two species are extremely similar, but differ obviously in wing 

 cell R b which is open in bicolor and petiolate in petiolata. It seems questionable 

 whether the two genera involved should both be considered valid, but Proriedelia 

 is here retained as valid since to synonymize it with Riedelia would not be fully 

 justified in the poor state of knowledge of the Imitomyiini as a whole. 



In both Riedelia and Proriedelia the proboscis is short and non-geniculate, there 

 are two post ia setae and the arista is plumose, and in these features the genera 

 differ from the type-genus of the tribe, Imitomyia Townsend (synonym Diplopota 

 Bezzi). In Imitomyia the proboscis is extremely attenuate (much longer than 

 head height and usually geniculate), there is one post ia seta and the arista is 

 pubescent, not plumose. Riedelia should probably be looked upon as the most 



