TACHINIDAE OF ORIENTAL REGION . 61 



to include them. Eustacomyia differs from Palpostoma by having the propleuron 

 haired, and A palpostoma by having an M 2 appendix at the bend of M. 



Two small corrections should be noted to my treatment of Palpostoma in the 

 earlier work (Crosskey, 19736 : 54 & 175). In the key to Australian genera the 

 presence of two post ia was cited as differentiating Palpostoma and allies from 

 Eutrixopsis. It has now been realized that at least P. aldrichi has only one post 

 ia seta and modification is needed to cover this: the second half of the first couplet 

 (p. 54) should be amended to read 'Two post ia setae (except in P. aldrichi with 

 one)'. The second correction concerns the host list (p. 175) where the hosts listed 

 against P. testaceum should be read against P. aldrichi { = P. testaceum sensu Aldrich 

 and auct.) as the identity of the true testaceum remains unsettled. 



Key to Oriental Genera of PALPOSTOMATINI 



Antennae normal, their length about half the eye-height or more and at least equal 

 to the depth of the gena (Text-fig. 34) ; third antennal segment in facial view more 

 than twice as long as the second segment, its apex falling short of the oral margin 

 by a distance not or only slightly greater than the whole antennal length. Lower 

 anterior part of the head normal, vibrissa! angles well formed (Text-fig. 34) and the 

 epistome not constricted between flattened subfacials. Vibrissae present. Lower 

 calypter small and evenly rounded, not touching the scutellar base, pra seta 

 absent ............. 2 



Antennae very reduced, their length much less than half the eye-height and less than 

 the depth of the gena (Text-fig. 33) ; third antennal segment not or only slightly 

 longer than the second segment, its apex falling short of the oral margin by a distance 

 at least twice as great as the whole antennal length. Lower part of the head 

 strongly modified, vibrissal angles undifferentiated (Text-fig. },},) and the epistomal 

 region moderately to very strongly constricted between dilated subfacials (Text-figs 

 65-67). Vibrissae absent or poorly differentiated. Lower calypter at least 

 slightly widened posteriorly, usually juxtaposed to the scutellum near the base. 

 pra seta present or absent .......... 3 



Presternum bare. Three prst dc setae. Vertex seen from above as wide as an eye 



in both sexes. $ without proclinate orbital setae . . HAMAXIELLA Mesnil 



Presternum setose (each side with at least one long seta or strong hair directed 

 downwards). Two prst dc setae. Vertex seen from above much narrower than an 

 eye (especially in o*)- 9 with small (irregularly developed) proclinate orbital setae, 

 inserted close to the frontal setae . . . PALPOSTOMA Robineau-Desvoidy 



Pre-alar seta absent. One strong post ia seta. Antennal sockets almost contiguous 

 (Text-fig. 65). Head virtually holoptic in both sexes (Test-fig. 65). Proboscis and 

 oral cavity well developed EUTRIXOPSIS Townsend 



Pre-alar seta present (about subequal in size to the sa seta). Post ia setae two or 

 none (? constant). Antennal sockets conspicuously separated (Text-figs 66, 67). 

 Head holoptic in <$ (Text-fig. 66), widely dichoptic in $ (Text-fig. 67). Proboscis 

 and oral cavity exceptionally reduced, the proboscis almost entirely concealed in 

 the small cavity and hardly at all visible in profile ...... 4 



Parafacials setulose. Sternopleural setae present. Two post ia setae. Pteropleuron 



with some long stiff setae ....... ZAMIMUS Malloch 



Parafacials bare. Sternopleural setae absent. No post ia setae. Pteropleuron 



finely haired, without any stiff setae . . . XANTHOOESTRUS Villeneuve 



[The forms running out in this couplet are known from very few specimens. 

 The characters cited might not prove constant.] 



