24 R. W. CROSSKEY 
wider than facial carina. Tegula without long fine wirysetulae. Palpi exceptional- 
ly long and slender. Costal base explanate and with very long dense fringe 
(wings in folded position therefore appearing to have strongly developed 
‘shoulders’). [Moluccas only]. : . FORMODEXIA gen. n. (p. 38) 
- Postalar wall without hair tuft, money, eaeey bare (few specimens with a few hairs 
on extreme upper part adjacent to the dorsolateral ridge of the postalar callus). 
Buccal opening broad, very much wider than facial carina in both sexes. Tegula 
with normal long fine wiry posterior setulae. Palpi normal. Costal base not 
explanate (wings in folded position without appearance of prominent ‘shoulders’). 
[Not from Moluccas] . 6 
6 Genal dilation small, only extending forwards for Boone fale the iene = ihe genal 
region and not as far as the most anterior point of the eye (Text-fig. 5). Proboscis 
with slender mentum that is conspicuously tapering in profile (Text-fig. 13). 
Postalar callus with 4-6 setae and body without white pollen spots on sides of 
thoracic dorsum and the abdomen. Wing membrane distinctly tinged with 
brown or yellowish brown. [New Guinea, New Britain, Aru Islands] 
RUTILODEXIA Townsend (p. 40) 
— Genal dilation well developed, reaching forwards for obviously more than half the 
length of the genal region and as far as the most anterior point of the eye (Text- 
fig. 4). Proboscis with broader mentum in which sides subparallel in profile 
(Text-fig. 12). Postalar callus with either three strong setae only or with 4—5 setae 
and body with white pollinose spots on thorax and abdomen. Wing membrane 
(except for basal dark mark) clear hyaline or almost so. [Australia] 
RUTILIA Robineau-Desvoidy (a few forms) 
7 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 light. Facial carina strongly bulbous on upper part and strongly 
contracted with sharp median ridge on lower part. Parafacial hairing reaching 
below the lowest point of the eye and virtually continuous with hairing on genal 
dilation. [Western Australia only] 
CHRYSOPASTA Brauer & Bergenstamm (p. 102) 
— Dorsum of thorax without such pattern. Palpi as long 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 widened above and 
contracted ventrally (in latter case not normally formed into very narrow sharp 
ridge). Parafacials bare or haired, but if haired the hairing not normally extending 
below lowest point of eye in profile and well separated by conspicuous bare area from 
hairing on the genal dilations : : : : 8 
8 Intermediate abdominal tergites (T3 and T4) pace Giscal seeae! Facial carina 
usually very broad and flattened, often slightly sulcate, with subparallel sides, at 
most only a little knob-like dorsally and contracted ventrally. Abdomen without 
bold black-and-white pattern (rare exceptions). Forms often with partly metallic 
head or with deep median depressioninabdominalT5. [Widespread in Oriental and 
Australasian Regions] . : RUTILIA Robineau-Desvoidy (most forms) (p. 42) 
— Intermediate abdominal tergites (T3 and T4) with discal setae (lacking in occasional 
specimens on one or other of these tergites, very rarely on both; if absent then 
abdomen with bold black-and-white pattern). Facial carina widest dorsally 
between junctions of second and third segments of the antennae and conspicuously 
narrowed ventrally, not subparallel-sided and not flattened on anterior face. 
Abdomen most often with bold black-and-white pattern. Head never metallic, 
completely pollinose, and abdominal T5 without wide median depression. [New 
Guinea, Australia and Lord Howe Island] ; . AMPHIBOLIA Macquart (p. 93) 

