TACHINIDAE OF AUSTRALIA 47 



Tribe RUTILIINI 



This tribe occurs only in the Oriental and Australasian Regions, and forms a 

 dominant element in the tachinid fauna of Australia. A revisionary classification 

 of the tribe has just been published (Crosskey, 1973) and no further discussion 

 is needed here. 



Key to Australian Genera of RUTILIINI 



1 Suprasquamal ridge bare. Prosternal membrane bare ...... 2 



- Suprasquamal ridge haired. Prosternal membrane bare or haired .... 5 



2 Palpi minute, not longer than basal width of mentum and not longer than third 



antennal segment. Buccal opening very long and narrow, at narrowest point 

 not wider than facial carina. Arista conspicuously short-plumose. Upper 

 calypter enlarged, when wings folded usually as long as lower calypter 



PRODIAPHANIA Townsend 



- Palpi well developed, very much longer than either the basal width of mentum or 



the third antennal segment. Buccal opening wide, much broader than facial 

 carina. Arista pubescent (occasionally with very short plumosity). Upper 

 calypter normal ............ 3 



3 Postalar callus with two strong setae (sometimes with one very much shorter and 



weaker setula differentiated from hair in addition). Epistome subnasute, facial 

 profile deeply excavate between epistome and carina. Palpi sexually dimorphic, 

 distinctly clubbed or spatulate in § and slender in £. Infrasquamal hairs some- 

 times present. Scutellum normally with only three pairs of marginal setae (at 

 most with four, apicals included) .... CHETOGASTER Macquart 



- Postalar callus with three or more strong setae. Epistome not very strongly 



prominent, facial profile usually only slightly concave between epistome and 

 carina. Palpi not sexually dimorphic, long and slender in both sexes (at most 

 only a trace of swelling at extreme tips). Infrasquamal hairs absent. Scutellum 

 normally with 4-1 1 pairs of marginal setae (including apical pair), very rare 

 specimens with only three pairs ......... 4 



4 Apical scutellar setae inserted at a conspicuously lower level than the other scutellar 



marginal setae. Postalar wall without dense hair tuft. Ventral margins of 

 abdominal tergites usually with rather weak vestiture, often hair-like, if moderately 

 strong spiniform setae present then these directed backwards as well as downwards 



RUTILIA Robineau-Desvoidy (a few forms) 



- Apical scutellar setae inserted at the same level as the other scutellar marginal 



setae. Postalar wall with dense hair tuft. Ventral margins of abdominal 

 tergites with very strong spiniform setae directed downwards 



FORMOSIA Guerin-Meneville 



5 Dorsum of thorax with four broad bold black vittae which are interrupted at the 



transverse suture, appearing therefore to have eight elongate black spots (four on 

 prescutum and four on scutum). Palpi much shorter than mentum. Postorbits 

 with alternating silvery white and black spots which shift in appearance with 

 direction of the light. Facial carina strongly bulbous on upper part and strongly 

 contracted into sharp median ridge on lower part. Parafacials fully haired, 

 hairing reaching to a level below the lowest point of the eye and virtually continuous 

 with hairing on the genal dilations. [Western Australia] 



CHRYSOPASTA Brauer & Bergenstamm 



- Dorsum of thorax without such pattern. Palpi as long as or almost as long as 



mentum. Postorbits without pattern of alternating white and black areas. 

 Facial carina broad and flattened on anterior surface with subparallel sides, or 



