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. 
KeEy TO AUSTRALIAN GENERA OF RUTILIINI 
I Suprasquamal ridge bare. Prosternal membrane bare . : : - 3 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 . - a 
3 Postalar callus with two strong setae (sometimes ort one — each ‘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 9 and slender in g. 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 4-11 pairs of marginal setae (including apical pair), very rare 
specimens with only three pairs : 4 
Apical scutellar setae inserted at a conspicuously lower level — the other sentellar 
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 Guéerin-Meéneville 
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 
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