n8 R. W. CROSSKEY 



Phorcidella is known in the region only from the holotype of the type-species, but 

 this may be an aberrant specimen (it differs in the J from all other Oriental exoristines 

 in having only one pair of reclinate orbital setae) . 



The genus Exorista is specially well represented in the region, but badly needs 

 revision. It is uncertain how many of the nominal species belonging in the genus 

 are valid, and the continued description of so-called new Exorista species from the 

 Oriental area (as by Chao, 1964a) without regard to previously described forms 

 serves only to make eventual revision more difficult. 



All the Oriental Exoristini have the following characteristics in common. 



Parafacials totally bare or at most only one or two small hairs below lowest frontal seta. 

 Male without proclinate orbital setae. Prosternum setulose. Propleuron bare (cf. Australian 

 Hillomyia Crosskey). 1 + 3 ia setae. 3 or 4 post dc setae. Scutellum with lateral and 

 apical setae. Mid tibia with a submedian v seta, and at least two ad setae; hind tibia without 

 pd preapical and pv apical setae. Second costal sector bare ventrally. Infrasquamal hairs 

 absent. Abdominal Ti + 2 excavate to hind margin (cf. Australian Hillomyia). 



All hosts so far known for Oriental Exoristini are lepidopterous. 



Key to Oriental Genera of EXORISTINI 



Wing with cell R 5 closed before the margin and with a distinct petiole. 2 + 3 dc 



setae CHAETORIA Becker 



Wing with cell R b open, at least narrowly, to the margin. 3 + 3 or 3 + 4 d c setae . 2 



Three post dc setae. Cross-vein m-cu unusually oblique and very remote from wing 

 margin, last section of vein Cu x usually nearly twice as long or more as m-cu. 

 Humeral callus with only two strong setae, sometimes with a weak third seta mesad 

 of the main two (very rarely with weak fourth setula set forwards in addition) 



STOMATOMYIA Brauer & Bergenstamm 



Four post dc setae. Cross-vein m-cu not unusually oblique and not very remote from 

 wing margin, last section of vein Cu x subequal in length to or only slightly longer 

 than m-cu (except conspicuously longer in Chetogena). Humeral callus normally 

 with four distinct setae, a basal row of three nearly in line and one set forwards . 3 



Upper occiput with a more or less regular row of well developed black setulae behind 

 the postocular row. Occipital region of the head slightly but obviously swollen 



CHAETEXORISTA Brauer & Bergenstamm 



Upper occiput without black setulae behind the postocular row (at most with very few 

 such setulae haphazardly near the vertex in Bessa). Occipital region of the head 

 flat or virtually so ........... . 4 



Facial ridges with strong downcurved setae on almost their entire height. Eyes 



densely haired ............ 5 



Facial ridges bare except for a few setulae near the vibrissae or weakly setulose only 



on their lower halves. Eyes bare or haired ....... 8 



Vibrissae inserted at the level of the epistomal margin, epistome not very strongly 



warped forwards. Ocellar setae strong . . . . . . . 6 



Vibrissae inserted at a level distinctly above the epistomal margin, epistome strongly 



warped forwards. Ocellar setae very strong, very weak, or absent ... 7 



Apical scutellar setae directed very strongly upwards. Mid tibia with a very strong 

 submedian ad seta and two much smaller ad setae between it and the tibial apex 

 (of which the proximal one is smaller). On vein M distance between r-m and 

 m-cu usually conspicuously greater than distance between m-cu and the bend. 

 Larger forms, length 6-10 mm .... PHORINIA Robineau-Desvoidy 



