80 R. W. CROSSKEY 
— Wing with cell R,; open or at most only just closed at the wing margin. - : 2 
2 Parafacials with a row of strong black hairs or setulae (curving downwards). Basal 
node of vein R, , , with several long hairs or fine setulae on upper and lower surfaces, 
those of lower surface often forming a definite tuft [South Australia] 
Undescribed sp., ? gen. n. 
— Parafacials bare (apart from the strongly descending frontal setae). Basal node of 
vein R,,; usually with only one long strong setula on upper and lower surfaces, 
at most only two minute hairs in addition to the main setula : 3 
3. Mid tibia with one submedian ad seta. Hind coxa bare on posterodorsal eaarpint 
2 + 3 dc setae [Fiji, Tonga, Samoa] ‘ ; TONGAMYIA Mesnil 
— Mid tibia with two ad setae (a definite small ad oe nea just basad of the main 
one). Hind coxa bare or setulose on posterodorsal margin. 2 + 3 or 3 + 3 dc 
setae [Australia] . : : E : : c 4 
4 Hind coxa with black setulae on the peste cael fae 2 + 3 de setae. Fore 
tibia with two pv setae (basal one weak) [widespread eastern Australia] 
VORIELLA Malloch 
— Hind coxa bare on the posterodorsal margin. 3 + 3 dc setae (a third prst dc seta 
present between the main two and almost equally strong: ? aberrant). Fore tibia 
with one pu seta [may not be constant when more material known] [New South 
Wales] : : - : ; . : : : : Undescribed sp. 
Tribe SIPHONINI 
(Actiini) 
The cosmopolitan tribe Siphonini is the most distinctive in the Goniinae, and the Australian 
forms can be instantly recognized by their characteristic facies. This derives primarily from 
the following features: size very small (length about 3-4 mm, smallest Australian Tachinidae 
on average); head not sexually dimorphic (the sexes therefore rather difficult to recognize as 
both males and females have an equally broad frons, two pairs of proclinate orbital setae and 
strong outer vertical setae); scutellum with subapical setae convergent and usually crossing 
towards the tips (Text-fig. 67); pre-alar seta minute; legs rather short and with rather stiff 
setae (hind tibia unusual in having three strong preapical setae on upper surface —1.e. ad, d 
and pd preapicals — as shown in Text-fig. 18); abdomen without discal setae on any segment 
and with Tr + 2 excavate only on its anterior half; wings short and broad with costal margin 
deeply incised at apex of Sc and with bend of vein M unusually remote from cross-vein m-—cu 
(Text-fig. 89); wing veins more extensively setulose than in other goniines. 
The Australian distribution includes Tasmania, and there are three genera 
represented in the area. The most notable absentee is the genus Szphona Meigen, 
which although represented by at least one species in New Guinea has not yet been 
found in Australia. This genus is not included in the key as, if found later in 
Australia, it will be immediately recognisable by the extremely long slender angled 
proboscis that is at least as long as the head height (all genera known in Australia 
have a short inconspicuous proboscis). 
It is necessary to note here some changes in nomenclature of Australian siphonines. 
Crosskey (1966b) applied the generic name Strobliomyia Townsend to several 
Australian species, using the nomenclature given by Mesnil (1963). Mesnil noted 
two older names for Strobliomyia, viz. Herbstua Robineau-Desvoidy and Peribaea 
Robineau-Desvoidy, but considered that they were both preoccupied and therefore 
that Strobliomyia was the valid name. Mesnil was right about Herbstia Robineau- 
