
TACHINIDAE OF AUSTRALIA 87 
[Two specimens (¢ 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 facies. ] 
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. vemota, 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. 
Kry To AUSTRALIAN GENERA OF ETHILLINI 
I 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. 9 with a pair of strong 
prevertical setae that curve outwards over the eyes and without outer vertical 
setae. Pre-alar seta longer than first postiaseta . PHOROCEROSOMA Townsend 
