TACHINIDAE OF ORIENTAL REGION 147 



- Mesonotum with reduced complement of 1 + 1 (? or 2) acr setae. Wing with cell 



i? 5 just closed in the margin and with the last section of vein C«j subequal in 

 length to m-cu. Second costal sector haired ventrally . SUENSONOMY1A Mesnil 



8 Wing with cell i? 5 closed well before the margin and therefore long-petiolate (petiole 



at least twice as long as r-m). Two prst dc setae ...... 9 



- Wing with cell R b open or just closed at the margin (therefore no petiole). Three 



prst dc setae ............ 10 



9 Head strongly triangular in profile (Text-fig. 54) and with the frons nearly horizontal. 



Arista greatly thickened on three-quarters (?) or the whole (<J) of its length, 

 the second aristal segment greatly elongate (about five or six times as long as 

 broad). One pair of reclinate orbital setae. Apical scutellar setae horizontal. 

 o* abdomen without hair fascicles, o* with proclinate orbital setae (one pair) 



DIATRAEOPHAGA Townsend 



- Head shape normal in profile, frons strongly sloping and antenna] axis near level 



of eye middle. Arista normal, only slightly thickened at base, its second segment 

 not elongate. Three pairs of reclinate orbital setae. Apical scutellar setae 

 directed strongly upwards, o* abdomen with dense recumbent hair fascicles 

 on venter of T4 and T5. <J without proclinate orbital setae . CES TO NIA Rondani 



10 Mid tibia with a submedian v seta. Barettc bare or if with a few hairs then these 



confined to anterior half. Pre-alar seta conspicuously stronger than first post ia 

 seta. Forms without specially distinctive colour pattern and not exceptionally 

 strongly sexually dimorphic . . . . . . . . . . 11 



- Mid tibia without a submedian v seta. Barette haired along its length (sparsely 



in ?). Pre-alar seta weaker than first post ia seta. Forms strongly dimorphic 

 in colour and pattern: q* with thorax and first abdominal segment black and 

 strongly contrasting with remainder of abdomen which is bright golden orange 

 or orange-red (except sometimes for dark tergite margins and dark narrow 

 central vitta); ? black, with pleural regions, two fasciae on mesonotum, apex 

 of scutellum, and transverse band on each abdominal tergite 3—5, greyish yellow 

 to bright golden BACTROMYIELLA Mesnil 



11 Eyes haired (hairing usually long, dense and very conspicuous, easily seen at X 25) . 21 



- Eyes bare (a few sparse and very minute hairs sometimes visible under high 



magnification, eye appearing generally bare at X 25) . . . . . 21 



12 Four sternopleural setae (2 + 2). Blackish forms with the following characters 



present simultaneously: two pairs of reclinate orbital setae, humeral callus with 

 the three main setae standing in line, mid tibia with one ad seta, second costal 

 sector bare ventrally ........... 13 



- Two or three sternopleural setae. Varied forms not possessing these characters 



simultaneously . . . . . . . . . . . .14 



13 Facial ridges bare. Second sa seta long and strong, at least as large as the pra 



seta and usually longer. Apical scutellar setae horizontal. Abdominal T3 

 and T4 without discal setae, o* abdomen with T4 unusually large in relation 

 to other tergites (much longer than T3 and three or more times as long as T5). 

 o" abdomen entirely shining black, or at least entirely shining black on the whole 

 of T4 and T5 (pollinosity absent or very reduced) . APLOMYA Robineau-Desvoidy 



- Facial ridges setulose on half or more of their height. Second sa seta very small, 



much shorter and weaker than the pra seta. Apical scutellar setae directed 

 upwards or half-upwards. o* abdomen with T4 normal, subequal in length to 

 T3 and only slightly longer than T5. o* abdomen not strikingly shining black, 

 extensively dulled with pollinosity PSEUDOPERICHAETA Brauer & Bergenstamm 



14 Parafacials haired on upper half . Ocellar setae absent. Facial ridges strongly setose 



on their whole height and widely visible in profile. Arista thickened on nearly 

 all its length. Mid tibia with more than one ad seta (3-4 in the one known 

 specimen) BO TRIOPSIS Townsend 



