80 R. W. CROSSKEY 



- Wing with cell Z? 5 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 7? 4 , 5 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 i? 4+5 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 margin. 



2 + 3 dc setae [Fiji, Tonga, Samoa] .... TONGAMYIA Mesnil 



- Mid tibia with two ad setae (a definite small ad seta present just basad of the main 



one). Hind coxa bare or setulose on posterodorsal margin. 2 + 3 or 3 -)- 3 dc 

 setae [Australia] ............ 4 



4 Hind coxa with black setulae on the posterodorsal margin. 2 + 3 dc 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 pv 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 - i.e. ad, d 

 and pd preapicals - as shown in Text-fig. 18) ; abdomen without discal setae on any segment 

 and with Ti + 2 excavate only on its anterior half; wings short and broad with costal margin 

 deeply incised at apex of 5c 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 Siphon a 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 (19666) 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. Herbstia 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- 



