72 R. W. CROSSKEY 



or four stpl setae (2 + 1 or 3 + 1) ; infrasquamal hairs present; pteropleural seta present or 

 absent; mid tibia without a v seta in the <$, with a v seta in the $ [this sexual difference 

 apparently constant to judge from limited material seen]; hind coxa bare posterodorsally ; 

 hind tibia without pd preapical seta and without pv apical seta; wing with only a few weak 

 hairs on basal node of -R 4 + 5 , veins otherwise bare; cell i? 5 open to the wing margin; bend of 

 M rather abruptly angulate but without M 2 spur or fold; abdomen of both sexes unusual, 

 in ^ T6 and T7 + 8 exposed and forming a conspicuous vertical declivity at the end of the 

 abdomen, and in 9- postabdomen strongly developed and recurved with elaborately modified 

 ovipositor (sometimes resembling that of some Phasiinae such as Cylindromyiini) ; abdominal 

 sternites exposed. 



The strange genus Australotachina Curran does not completely conform with the 

 characters cited above, as it has sparse black hairs on the upper half of the occiput, 

 has four post dc setae, the <$ has a submedian v seta on the mid tibia, there is an 

 extra pair of scutellar setae, and the bend of vein M is rather gently rounded, but 

 it seems nevertheless best to place it with the parerigonines until its affinities can 

 be more reliably determined; its head profile is shown in Text-fig. 42. 



Key to Australian Genera of Parerigonini 



Scutellum with three pairs of very strong setae (basals, subapicals and crossed 

 apicals). o -\- 2 ia setae. Propleuron usually haired. 3 + 3 dc setae (occasionally 

 weak fourth prst dc seta) .......... 2 



Scutellum with four pairs of strong setae (a pair of enormous laterals present in 

 addition to basals, subapicals and crossed apicals). + 3 ia setae (a weak 

 hair-like post ia seta present in front of the main two). Propleuron bare. 3 + 4 

 dc setae A USTRALOTA CHINA Curran 



Abdomen with Ti + 2 and T3 normal, not fused, with excavation of Ti + 2 

 reaching the hind margin. Barette haired on anterior half. Posterior thoracic 

 spiracle not exceptionally large, about as long as the barette or only a little more. 

 Both thoracic spiracles brown or blackish. Legs and all thoracic hair black . 3 



Abdomen with Ti -f 2 and T3 fused into a single very large composite tergite in 

 which the excavation is confined to the basal part. Barette bare. Posterior 

 thoracic spiracle exceptionally large, very much longer than the barette. Both 

 thoracic spiracles pale yellowish. Legs reddish yellow (except for apical darkening 

 of the tarsi) and hair of sides of the thorax golden orange or yellow 



PYGIDIMYIA Crosskey 



Eyes densely and conspicuously hairy. Epistome usually only moderately prominent, 

 vibrassae inserted above the epistomal margin by a distance not exceeding the 

 length of the second antennal segment .... LEVERELLA Baranov 



Eyes bare or almost so (at most only with very sparse inconspicuous and microscopic 

 hairs). Epistome strongly projecting, subnasute, vibrissae inserted above the 

 epistomal margin by a distance exceeding the length of the second antennal 

 segment (Text-fig. 46) ......... ZITA Curran 



Tribe LINNAEMYINI 



The Linnaemyini include forms that are superficially very like the Tachinini 

 but differ by having the dorsal surface of the hind coxa bare. All the Australian 

 forms have the eyes densely haired, and this helps to separate them at a glance 



