

TACHINIDAE OF AUSTRALIA 73 
from the Australian tachinines in which the eyes are always bare. Separate tribal 
status for Linnaemyini and Tachinini is in reality scarcely justified, but the Australian 
forms at least can be readily differentiated and separate tribal status is recognized 
for purposes of the present work. The following principal features are shared by 
the two groups: Epistome prominent or subnasute; vibrissae inserted well above 
level of epistomal margin; scutellum with similar bristling which usually includes 
erect subspiniform preapical setae; mid tibia with several ad setae and a submedian 
v seta; hind tibia with a pv apical seta; cell R; open; bend of vein M sharp and 
provided with an M, extension either as a definite spur vein or at least as a wing 
fold; pteropleural seta strong; abdomen with Tr + 2 excavate to its hind margin 
and with the sternites largely exposed; upper occiput without black setulae behind 
the postocular row. 
Three genera are known from Australia, at least one of which (Chaetophthalmus) 
occurs also in Tasmania. This genus up to now was believed to be entirely 
Australian, but undescribed species are now available from New Guinea and New 
Caledonia. Chaetophthalmus is the dominant linnaemyine genus in Australia, and 
the other genera appear to be uncommon to judge from material so far known; 
one of these is the widespread Old World and North American genus Linnaemya, 
and the other is the monotypic genus Apalpus which is known only from South 
Australia and Western Australia. The three genera can only be reliably separated 
by the vestiture, or lack of vestiture, on the parafacials, and there is some 
doubt whether generic status is fully justified. It may be noted that they all have 
3+ 3dc setae (Text-fig. 61) and in this respect differ from the tachinines in 
Australia which all have 4 + 4 dc setae or more; the propleuron is always bare, 
and this character (as well as the hairy eyes) is useful in differentiating Chaetoph- 
thalmus from the tachinine genus Microtropesa, which has some _ superficial 
resemblance to it. All the Australian Linnaemyini have very reduced palpi. 
KrEy TO AUSTRALIAN GENERA OF LINNAEMYINI 
I Parafacials haired. Normally two stpl setae. o + 3 ia setae [a prst ia seta probably 
sometimes occurs but has not been seen]. Epistome extremely prominent and 
nasute. Vibrissae inserted very high above the epistomal margin, distance from 
insertions to level of the epistomal margin as great as or greater than the length 
of the second antennal segment. Prosternal membrane and anterior part of 
prosternum usually finely haired (hairs if present may be pale and very 
inconspicuous). Abdomen rather rotund, appearing noticeably wider than 
thorax to naked eye : c : : : c ; : : - 
— Parafacials bare. Normally three stp/ setae. 1 + 3 ia setae [prst ia seta probably 
sometimes absent]. Epistome prominent but not strikingly nasute. Vibrissae 
inserted above the level of the epistomal margin by a distance less than the length 
of the second antennal segment. Prosternal membrane and prosternum bare. 
Abdomen more elongate, not noticeably wider than thorax to naked eye 
LINNAEMYA Robineau-Desvoidy 
2 Parafacials without any strong setae in addition to the hairing (Text-fig. 44) 
CHAETOPHTHALMUS Brauer & Bergenstamm 
— Parafacials each with one strong incurved seta near the lower end in addition to the 
hairing (see fig. 17 in Malloch, 1929b : 316) : d : : APALPUS Malloch 
Ne 
