78 R. W. CROSSKEY 



fold in the wing surface (Text-fig. 87). Propleuron bare (except in Hillomyia). 

 Presternum always haired or setulose. Infrasquamal hairs always absent. 

 Abdominal Ti + 2 excavate to its hind margin (except in Hillomyia). Mid tibia 

 always with a submedian v seta . . . . . . . . . 11 



11 Lower calypter normal, outer edge not bent downwards. Bend of vein M nearly 

 always with at least a trace of an M 2 appendix or at least a darkened fold in the 

 wing membrane continuing towards the wing margin (Text-fig. 87). Eyes bare 

 or haired. Three or four post dc setae. Barette usually haired only at its anterior 



end EXORISTINI (p. 85) 



- Lower calypter bent abruptly downwards on its outer margin (except in 

 Mycteromyiella) . Bend of vein M without trace of M 2 appendix or fold. Eyes 

 densely haired. Four post dc setae. Barette fully haired . . ETHILLINI (p. 87) 



Tribe ACEMYINI 



This is a small but nearly cosmopolitan tribe in which all the known hosts are 

 Orthoptera of the families Acrididae s.l. and Eumastacidae. The scutellar bristling 

 is distinctive among the Goniinae (Text-fig. 68) and comprises three pairs of very- 

 strong setae, an apical crossed pair, a subapical pair set unusually far forwards 

 on the sides of the scutellum and a basal pair. Most forms have a long series of 

 proclinate orbital setae in both sexes and many have the outer tip of the third 

 antennal segment formed into a rather sharp point, these features helping towards 

 instant recognition of the group; the basal node of vein R i+5 has only one extremely 

 strong setula on both surfaces of the wing, a feature that is relatively uncommon 

 in goniines, although found in the Neaerini. Only the single genus Ceracia Rondani 

 (syn. Myothyria Wulp) is known in Australia, and this is distinguished from other 

 acemyine genera by the following combination of characters: prosternum setulose; 

 head with proclinate orbital setae in both sexes; hind tibia without pv apical seta 

 (cf. Acemya Robineau-Desvoidy) ; humeral callus with three setae; cell R 5 closed 

 at or just before the wing margin (Text-fig. 88); two sternopleural setae; bend of 

 vein M rather abrupt and very remote from wing margin (Text-fig. 88); 2 + 3 dc 

 setae; vibrissae above the level of the epistomal margin; basicosta reddish yellow; 

 third antennal segment distinctly mucronate; head with inner eye margins strongly 

 diverging ventrally, parafacials not or hardly contracted at their lower ends. 



Tribe NEAERINI 



The Australian fauna contains several little known forms that are clearly very 

 closely allied to the genus Tongamyia Mesnil from Tonga and Fiji, and the 

 resemblance is indeed so complete that Voriella Malloch and Tongamyia ought 

 probably to be placed as synonyms (this is not considered further in the present 

 work as Voriella is the older name and would not have to be changed in the event 

 of synonymy). It is pertinent, however, that Mesnil (i960 : 649, footnote) associates 

 Tongamyia with the neaerines and the genus Neaera Robineau-Desvoidy, and 

 placement of Tongamyia in the Neaerini appears very reasonable on present evidence. 

 As Voriella is virtually indistinguishable from Tongamyia it, too, is here assigned 



