TACHINIDAE OF ORIENTAL REGION 151 



- Facial ridges bare or at most with some fine hairing on the lowermost third. 



Upper occiput with fine black setulae behind the postocular row. q* without 

 proclinate orbital setae. Hind tibia without a pd preapical seta . . . 42 



40 Hind tibia with a pd preapical seta. Humeral callus with the three setae standing 



almost exactly in line . . . . . . . . . . .41 



- Hind tibia without a pd preapical seta. Humeral callus with the middle one of 



the three setae standing slightly but distinctly forwards in relation to the other 



two PROSOPODOPS1S Townsend (part) 



4 1 Abdominal Ti + 2 with a pair of median marginal setae. Mid tibia with three strong 



ad setae of which the proximal and distal setae are more than half as long as the 

 median one. Facial ridges with the setae confined to the lower half 



LYDELLINA Yilleneuve 



- Abdominal Ti + 2 without median marginal setae. Mid tibia with one strong ad 



seta, usually with some weak ad setulae in addition which are less than half as 

 long as the main seta. Facial ridges setose on most of their height 



PROSOPODOPSIS Townsend (part) 



42 Antennal axis far above the level of the eye middle and facial profile appearing 



much longer than frontal profile; antennae correspondingly very long, third 

 segment about five or six times as long as second segment. Arista conspicuously 

 thickened on about three-fifths of its length. Antennal colour entirely bright 

 orange BACTROMYIA Brauer & Bergenstamm (part) 



- Antennal axis only slightly above the level of the eye middle and facial profile not 



appearing longer than frontal profile; antennae not elongate, third segment not 

 more than four times as long as second segment. Arista inconspicuously thickened 

 only at the base or at most on the basal third. Antennae blackish or dark 

 brown, second segment sometimes orange or reddish . . . . . ^ ^ 



43 Abdominal T3 and T4 each with a pair of fine short erect median discal setae. 



Two stpl setae. Facial ridges finely haired on lowermost third. Barette sparsely 

 haired on its anterior half, q" abdomen with very fine short dense hairing on 



most of the venter of T3 and T4 SCAPHIMYIA Mesnil 



[This genus is at present known only from the holotype of the type-species 

 and the above-cited characters may not prove constant when other material 

 is found.] 



- Abdominal T3 and T4 without trace of discal setae. Three stpl setae. Facial 



ridges bare (only the usual tiny setulae adjacent to the vibrissae). Barette bare 

 or at most with two long hairs at the extreme anterior end. q* abdomen without 

 such modified hairing ........... 44 



44 Lower ends of the facial ridges distinctly visible in profile. Gena wider than third 



antennal segment. Basicosta yellow. Tip of $ abdomen conical and with a 

 short straight shining and strongly sclerotized ovipositor projecting from it. 

 Abdomen shining black with fasciae of pale greyish white pollinosity on anterior 

 half of T3 and T4 and traces of similar pollinosity anterolaterally on T5 



XYLOTACHINA Brauer & Bergenstamm 



- Lower ends of facial ridges invisible in profile or virtually so. Gena slightly 



narrower than third antennal segment. Basicosta dark brown or blackish. 

 Tip of ? abdomen truncate and without an exserted horny ovipositor. Abdomen 

 with extensively greyish white pollinosity that has a 'shifting' appearance, 

 only blackish to naked eye on extreme hind margins of T3 and T4 and apically 

 on T5 . . . . . 'Erycia' nymphalidophaga Baranov (? genus) 



45 Profrons extremely prominent, head shape generally similar to that of Diatraeophaga 



(Text-fig. 54), profrons very much wider than the gena and the gena subequal in 

 width to the third antennal segment. Abdominal T3 and T4 each with a pair 

 of median discal setae. Arista thickened on about three-quarters of its length. 

 Humeral callus with only two clearly differentiated setae (the innermost one of 



