TACHINIDAE OF AUSTRALIA 87 



[Two specimens (<J and 9) are in BMNH, London, collection that run out here. 

 They are from Northern Territory. Superficially they much resemble the genus 

 Phorinia Robineau-Desvoidy and should perhaps be assigned to it. The presence 

 of only three post dc setae may be an aberration, as four would be expected from 

 the total fades.] 



7 Interfrontal area at mid point subequal in width to parafrontal or at least two-thirds 

 as wide. Second aristal segment not more than twice as long as wide 



AUSTROPHOROCERA Townsend 



- Interfrontal area at mid point not more than half as wide as parafrontal in most 

 specimens, occasionally up to two-thirds as wide. Second aristal segment 

 about 2-5-4 times as long as wide .... EOZENILLIA Townsend 



[This is the least satisfactorily distinguishable genus in the Australian exoristine 

 fauna. The one included species, E. remota, is undoubtedly congeneric with 

 Eozenillia type-species and is therefore assigned to Eozenillia. Distinctions 

 between Eozenillia and Austrophorocera are very intangible, and probably the 

 former should be synonymised with the latter.] 



Tribe ETHILLINI 



This small group was originally defined by Mesnil (1944) to include an aggregate 

 of forms possessing a facies much like that of the Winthemiini or Sturmiini but 

 differing from these in having a small pre-alar seta and by having the outer edge 

 of the lower calypter conspicuously bent downwards. These characteristics 

 undoubtedly help to define what appears to be a natural group, although some 

 species of undoubted sturmiines and carceliines have a similar 'downbent' calypter. 

 Conversely some forms such as Mycteromyiella in which the lower calypter is not 

 markedly bent down on its outer margin seem to belong in the Ethillini. The 

 undescribed New Guinea fauna contains several interesting forms which to a large 

 extent bridge the gap between Phorocerosoma (placed by Mesnil in the ethillines) 

 and Mycteromyiella (placed by Mesnil in the sturmiines) and it seems most 

 appropriate - on present knowledge at least - to assign Mycteromyiella to the 

 Ethillini. 



The known hosts of Phorocerosoma are acridid grasshoppers and the known 

 hosts of Mycteromyiella are species of Mantodea, but host records have not yet 

 been obtained in Australia itself. The tribal distribution includes Tasmania 

 as well as continental Australia. It is important to note that the characters given 

 in the following key for Phorocerosoma apply to the single species known to occur 

 in Australia, but do not necessarily fit extra-limital species of the genus. The 

 generic identities of most of the New Guinea ethillines are too uncertain at present 

 for these forms to be covered in the key. 



Key to Australian Genera of ETHILLINI 



1 Inner vertical setae converging and crossing before their apices. Abdominal 

 Ti + 2 and T3 each with two pairs of very long strong erect median marginal 

 setae. Abdomen without discal setae on intermediate tergites. Humeral 

 callus with the three main setae standing in a triangle. $ with a pair of strong 

 prevertical setae that curve outwards over the eyes and without outer vertical 

 setae. Pre-alar seta longer than first post ia seta . PHOROCEROSOMA Townsend 



