



REVISIONARY CLASSIFICATION OF RUTILIINI 115 
unusual features. Within the seven species three different shapes of surstylus 
occur (Text-figs 45-47) and there are slight differences in the thickness of the cerci 
when seen in profile: in oblonga, pellucida and argentifera (probably also auriceps of 
which the male is unknown at present) the surstyli are rather long and tapering and 
the cerci are shorter than the surstyli (Text-fig. 46); in canberrae the surstylus is 
very small in relation to the epandrium and the cerci are much longer than the 
surstyli (Text-fig. 45); and in violacea and viridis the surstyli are large, a little more 
blunt than in the oblonga type, and the cerci are wide in profile (Text-fig. 47). The 
three shapes are easily distinguished from one another, and it is perhaps questionable 
whether the supposed species in which the male genital conformation is identical 
are really distinct from one another. But on present evidence it appears best to 
maintain viridis as distinct from violacea, and likewise argentifera and pellucida as 
distinct from oblonga, in spite of the lack of genital differences. 
Finally it may be noted here that the holotype of C. oblonga (Macquart) conflicts 
with Paramonov’s (1968 : 364) placement of this species in his key: the abdomen 
is not ‘reddish-yellow, semipellucid, with only a narrow, median black stripe’ as 
stated in Paramonov’s key, and oblonga holotype runs to gratiosa in Paramonov’s 
key. Examination of the holotypes of oblonga and gratiosa, together with other 
material, indicates that the types are conspecific, and gratiosa is therefore placed 
here as a new synonym of oblonga. 
INCLUDED SPECIES 
Chetogaster argentifera Malloch. AUSTRALIA (Australian Capital Territory, 
New South Wales, Victoria). [Holotype examined]. 
C. auriceps Paramonov. AUSTRALIA (Queensland). 
C. canberrae Paramonov. AUSTRALIA (Victoria to Queensland). [Holotype 
examined]. 
C. oblonga (Macquart). AUSTRALIA (New South Wales, Victoria). [Holotype 
examined]. 
gratiosa Paramonov syn. n. [Holotype examined]. 
C. pellucida Paramonov. AvsTRALIA (New South Wales). [Holotype exa- 
mined]. 
C. violacea Macquart. AUSTRALIA (Tasmania to Queensland). [Holotype 
examined]. 
C. viridis Malloch. AustRaLia (New South Wales, Queensland). [Holotype 
examined]. 
Key To SPECIES OF THE GENUS CHETOGASTER 
1 Calyptrae bright orange-yellow. Wings conspicuously yellow or yellow-orange 
anterobasally (as all basal veins with this colour) and faintly but distinctly tinged 
with yellowish or smoky brownish colour elsewhere. Infrasquamal setulae 
present.? g surstyli and cerci in profile as in Text-fig. 47 (cercus rather broad and 
sharply narrowing at tip). Large species, length normally 16-20 mm. , : 2 
3 The infrasquamal setulae consist of a small tuft of hairs immediately below the base of the lower 
calypter on the mediotergite. They are very small and careful examination is required. 
