TACHINIDAE OF AUSTRALIA 81 
Desvoidy which is preoccupied by Herbstia Edwards but wrong about Peribaea 
which is not preoccupied. The valid name for the genus previously called 
Strobliomyia is now, therefore, Peribaea. Mesnil (1963 : 803) placed the names 
Schizoceromyia Townsend and Schizactiana Curran as synonyms of Strobliomyia 
(= Peribaea) but these synonymies are in error; the type-species of Schizoceromyia 
and Schizactiana have been examined, and neither has the strong downwardly 
directed prostigmatic seta that characterises Peribaea; on the contrary, both 
type-species have all the essential characters of Ceromya Robineau-Desvoidy, and 
the names Schizoceromyia and Schizactiana are therefore moved into new synonymy 
with Ceromya. 
Some species of Peribaea have the third antennal segment deeply cleft in the 
male, and a bifid male third antennal segment occurs in fergusoni Bezzi and valida 
Curran (the type-species of Schizoceromyia and Schizactiana respectively). Mesnil’s 
placement of Schizoceromyia and Schizactiana in synonymy with Peribaea (as 
Strobliomyia) was evidently due to this feature —as the type-species were known 
to him only from descriptions, which did not mention the prostigmatic setae. 
It is now clear that forms with bifid or ramose male third antennal segments occur 
in both Peribaea and Ceromya —and indeed also in Actia (in which A. baldwini 
is one such species). Cleaving of the third antennal segment is extremely rare in 
the Australian tachinid fauna, and these siphonines are the only described Australian 
forms in which such a characteristic occurs. 
The Siphonini are here placed in their traditional position, but there are reasons 
for thinking that they would be better placed in the Tachininae—notably certain 
features in the larval morphology (Herting, personal communication). 
KeEy TO AUSTRALIAN GENERA OF SIPHONINI 
I Thorax with two strong subequal prostigmatic setae, one directed upwards and the 
other downwards (Text-fig. 8). Wing with sixth vein extending to wing margin. 
Mid tibia with one strong ad seta . : : . PERIBAEA Robineau-Desvoidy 
-— Thorax with one strong prostigmatic seta, directed upwards. Wing with sixth vein 
usually stopping short of wing margin (occasionally traceable to peg as weak 
fold). Mid tibia with or without anadseta . : 2 
2 Sternopleuron with a regular row of fine hairs in front of the mid coxa (Text- fie. I 4) 
Lowermost sternopleural seta very weak and placed about as far from the mid 
coxal base as from the upper anterior thee seta [condition not known for 
: all included species] : - . ACTIA Robineau-Desvoidy 
Sternopleuron completely bare. laterally in front of the mid coxa. Lowermost 
Pas ccn) seta either very strong and placed very near the mid coxal base or 
(in feygusont) undeveloped so that there are only two sternopleural setae [condition 
not known for all included species} : : . CEROMYA Robineau-Desvoidy 
| - 
| 
| 
Tribe BLONDELIINI 
This tribe contains a very large number of genera each with relatively few species. 
| There is great diversity of body form and chaetotaxy within the group, but it is 
| usually possible to recognize the blondeliines reliably among the goniines by the 
possession of three main features in combination, viz. pre-alar seta small or minute 
F 

