TACHINIDAE OF ORIENTAL REGION 143 



Included genera. Botriopsis Townsend, Dolichocolon Brauer & Bergenstamm, 

 Frontina Meigen, Lydellina Villeneuve (doubtfully included), Prosopodopsis Town- 

 send, Suensonomyia Mesnil. 



In Lydellina the setae of the facial ridges are confined to about the lower three- 

 fifths or half and the total facies is not particularly Frontina-like, and this genus 

 is placed here with some doubts. If it is excluded from consideration then the 

 remaining included genera fall into two groups, each containing genera that appear 

 to be phyletically very close together. The first of these subgroups contains Fron- 

 tina, Dolichocolon, Botriopsis and an unnamed form (probably representing a new 

 genus) and has the facial ridges clearly visible in profile for the whole of their height, 

 and a normal goniine wing venation in which the section of M between m-cu and 

 the bend is much shorter than the section between r-m and m-cu. The second 

 subgroup contains Prosopodopsis and Suensonomyia and has the facial ridges 

 invisible (or virtually so) in profile and has in nearly all species an unusual wing 

 venation in which the section of vein M from m-cu to the bend is exceptionally 

 elongate, being subequal in length to the section of ,1/ between r-m and m-cu and 

 very much longer than m-cu itself (in the Frontina subgroup the distance from 

 m-cu to the bend is actually shorter than the length of m-cu). It is possible that 

 these subgroups are not phyletically very closely related, but they are here aggre- 

 gated into the Frontina-group mainly on account of the very strongly setose facial 

 ridges and the form of head profile (in which the head greatly recedes at the epistomal 

 level in relation to the antennal level, the head being very much shorter at the 

 epistomal axis than at the antennal axis). 



Key to Oriental Genera 



i Wing veins bare (except for the usual few setulae on the node) ..... 2 



- Wing veins extensively setulose, setulae present on all of R v on R A , 5 to beyond 



r-m, and on the basal part of Cu l ......... 7 



2 Eyes densely haired ........ BOTRIOPSIS Townsend 



- Eyes bare ............. 3 



3 Scutellum without lateral setae. Head with one pair of reclinate orbital setae 



DOLICHOCOLON Brauer & Bergenstamm 



- Scutellum with one or more pairs of lateral setae. Head with two or three pairs of 



reclinate orbital setae ........... 4 



4 Sides of the thorax and the genae with pale yellow hair. Intermediate abdominal 



tergites with irregular spiniform discal setae. Wings conspicuously brown 

 anteromedially. o* without or with one pair of proclinate orbital setae 



FRONTINA Meigen 



- Sides of the thorax and the genae black-haired. Intermediate abdominal tergites 



without discal setae. Wings hyaline or if slightly brown then uniformly so. <J 



with two pairs of proclinate orbital setae ....... 5 



5 Facial ridges prominently visible in profile on their whole height. Scutellum with 



two pairs of very strong lateral setae and with the subapical setae standing close 

 together (distance between their bases very much less than that between a 

 subapical seta and its corresponding basal seta). Ocellar setae absent or virtually 

 so. [Very large form, length about 15 mm, with appearance of Tachinini.] 



Undescribed sp. (? gen. n.) 



