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 5 open; bend of vein M sharp and 

 provided with an M 2 extension either as a definite spur vein or at least as a wing 

 fold; pteropleural seta strong; abdomen with Ti -+- 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 + 3 dc 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. 



Key to Australian Genera of Linnaemyini 



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 ........... 2 



Parafacials bare. Normally three stpl 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 



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) .... APALPUS Malloch 



