TACHINIDAE OF ORIENTAL REGION 137 



Key to Oriental Genera 



Wing with cell i? 5 long-petiolate. 2 + 4 dc setae. Abdominal tergites without 

 discal setae. Apical scutellar setae moderately well developed, horizontal and 

 subparallel. rj with one pair of proclinate orbital setae. $ arista thickened on 

 its whole length and with the second segment about six times as long as broad 

 (equal in length to remainder of arista) . DIATRAEO PHAGA Townsend 



Wing with cell R u open. 3 + 4 dc setae. Abdominal T3-T5 each with discal setae. 

 Apical scutellar setae minute and hair-like, upwardly directed and convergent. 

 o" without proclinate orbital setae. $ arista thickened on two-thirds of its 

 length and with second segment about 2-5 times as long as broad 



METOPOSISYROPS Townsend 



ANEOGMENA-group 



Head shape normal, not triangular in profile, antenna] axis not much above eye middle. 

 Eyes bare or haired. Facial ridges bare or finely setose, not visible in profile. Parafacials 

 bare. Frontal setae usually strongly reclinate (not in Rhinomyodes). Two or three pairs 

 of reclinate orbital setae, usually not readily differentiated from the very strong reclinate 

 frontals, uppermost pair of reclinate orbitals sometimes reduced or absent (hence sometimes 

 only one pair in Rhinomyodes). Upper occiput flat or slightly sunken, without black setulae 

 behind the postocular row. J 1 without proclinate orbital setae. Arista normal, basal segments 

 short. Humeral callus with two or three setae in line, occasionally with additional fourth 

 seta set forwards. 2 + 3 or 3 + 3 dc setae. 2 or 3 stpl setae. Wing cell /? 5 open or short- 

 petiolate. Bend of vein M abruptly angulate, often a right-angle and sometimes with M t 

 appendix (short). Second costal sector bare ventrally (? Elodimyia, not checked). Mid tibia 

 with one or two ad setae. Hind tibia without pd preapical seta. 



Included genera. Aneogmena Brauer & Bergenstamm, Elodimyia Mesnil, Rhino- 

 myodes Townsend, Simoma Aldrich. Also to be included here is the Samoan genus 

 Neomedina Malloch, which is very closely related to Aneogmena: indeed, future 

 revisionary work will probably show that Neomedina should be synonymized with 

 Aneogmena and the definition of the latter slightly widened accordingly. (The 

 most obvious distinction is that Neomedina has the facial ridges setulose, but 

 it is questionable whether this alone is sufficient to justify separate generic status 

 in view of the complete conformity in all other characters.) 



The members of this group are all black flies with thin silvery white pollinosity 

 (forming indefinite transverse bands on the abdomen), usually with the scutellum 

 rather flattened, and with the postorbits conspicuously narrowing or evanescent 

 at their upper ends. The legs are always black and the wings (particularly in 

 Aneogmena) are often conspicuously brown anteriorly. 



Mesnil (1952a : 220) placed Aneogmena in the Sturmiina, thus dissociating it 

 from Simoma and Rhinomyodes , which he placed in his artificial subtribe Trypherina 

 (characterized by a petiolate cell R s ) (Mesnil, 1953a). In view of the very close 

 concordance of adult characters this is considered mistaken, and it is here preferred 

 to associate these genera (plus Elodimyia, which Mesnil described in Erythrocerina) 

 in the group - here termed the A neogmena-group - defined above, which seems 

 clearly monophyletic. 



