42 RoW. CROSSKEY 
4 Hair of the barette, posteroventral parts of the pteropleuron and outer edge of 
postalar callus golden yellow (in contrast with black hair on remainder of thorax). 
Prescutum with only indistinct traces of dark vittae. Head tawny or dark reddish 
with brassy yellow pollinosity. Wings rather conspicuously smoky on apical half 
and yellowish on basal half. [New Britain] . . &. prisca 
— Hair of barette and all hair of pteropleura and postalar ‘calli pad like the rest of the 
thoracic hair. Prescutum with four bold black-brown vittae. Head blackish 
brown with pale greyish yellow age ee not seu Er yellow and 
smoky brownish. [New Guinea] . ; : . RR. papua 
Genus RUTILIA Robineau-Desvoidy 
Rutilia Robineau-Desvoidy, 1830 : 319. Type-species: Tachina vivipava Fabricius, 1805, by 
subsequent designation of Crosskey (1967 : 26). 
Diacnosis. Facial carina large, often broad with subparallel sides, sometimes slightly 
knob-like or slightly evanescent ventrally. Epistome slightly to very strongly prominent. 
3 head never holoptic, upper frons at least as wide as facial carina, upper eye facets not enlarged. 
Parafacials bare or haired. Buccal opening normal, wider than facial carina in both sexes. 
Genal dilation well developed, usually rounded anteriorly and extending forwards nearly to 
level or beyond level of front of eye. Head normally mainly pollinose, partially metallic in 
some forms. Arista virtually bare to very short-plumose, usually pubescent. Palpi fully 
developed normal size (except reduced in micropalpis). Proboscis short with sides subparallel 
in profile or at most only a little tapering before labellae. Prosternum and prosternal membrane 
bare or haired. Scutellum with apical pair of setae inserted at lower level than other marginal 
setae (very rarely apicals absent); total of 3-10 pairs of marginals; disc of scutellum convex 
or flattened. Postalar callus with 3—5 (rarely 6) setae. Postalar wall bare (at most a very few 
hairs adjacent to those on callus edge). Suprasquamal ridge almost always haired, bare in a few 
species. Upper calypter normal. Tegula with normal long wiry posterior setulae. Costal 
base sometimes distinctly explanate. Abdomen with marginal vestiture of tergite venters 
weak and semi-recumbent (directed backwards), if bristling slightly spiniform then not directed 
vertically downwards; T3 with or without median marginal setae; intermediate tergites without 
discal setae. T5 of varied form, convex truncate conical to broad and flattened with median 
depression. 
DISTRIBUTION. Especially well represented and widespread in Australia, but 
occurring also in Oriental Region from India and Ceylon through Malaya to Philip- 
pines and Timor; poorly represented in New Guinea, occurring in Solomon Islands, 
New Hebrides, Fiji, Samoa and Lord Howe Island. Absent on present evidence 
from Moluccas and Bismarck islands. 
Discussion. The genus Rutilia in the wide sense here adopted (which corres- 
ponds in the main with the sense of the genus adopted by Malloch and Paramonov) 
is the largest genus of Rutiliini and contains nearly half the described species. It is 
the dominant element in the Rutiliine fauna of Australia, and contains most of the 
large metallic and boldly patterned species that are such a conspicuous element in 
the Australian dipterous fauna. The genus is not easy to define in a completely 
satisfactory way, and the diagnosis has perforce to take into account several species 
that differ from typical Rutilia in some conspicuous feature, even though on their 
totality of characters they must clearly be assigned to the genus: for example, some 
species have the suprasquamal ridge bare (e.g. cungulata Malloch and confusa Malloch, 
which were erroneously placed in Formosia by Malloch because of this), and 
