58 R. W. CROSSKEY 



flat; frontal setae reduced or hair-like, rows reaching about to level of first antennal segment; 

 antennae small or minute, third segment rounded apically and usually not longer than second 

 segment, ends of antennae falling short of margin of oral cavity by a distance at least equal 

 to length of third antennal segment and usually by a distance much greater than their own 

 length; arista bare to short plumose; prosternal region inflated, prosternum and membrane 

 bare; propleuron bare; propleural and prostigmatic setae often hair-like; humeral callus with 

 two strong setae in most forms; mesonotal chaetotaxy varied, often much reduced (Text-rig. 55), 

 normally 2 + 3 dc setae and o + 1 or o + 2 ia setae (rarely a minute third post ia or no ia 

 setae at all); pra seta small or very small, either one or two sa setae; usually two stpl setae, 

 sometimes only one ; pteropleural seta absent or present (if present usually weak) ; infrasquamal 

 hairs absent; scutellum usually with three pairs of marginal setae, the apicals usually crossed; 

 fore coxa usually bare on much of inner anterior surface; mid tibia without submedian v seta 

 or with a small v seta; hind coxae bare posterodorsally, not remote from abdomen; hind 

 tibia with small pv apical seta and two dorsal preapicals; wing with second costal sector 

 usually rather long and haired ventrally; costal margin sometimes (in New World forms only) 

 with callus-like dilation between apices of R 1 and i? 2+3 in £; cell i? 5 open or closed; bend of 

 vein M very sharp, usually about a right-angle, usually with short M 2 stump-like appendix; 

 distance from bend of M to m-cu shorter than or subequal to m—cu/r^m; upper surface of 

 wing veins totally bare or with a few minute hairs only on basal node of -R 4+5 ; lower calypter 

 broad, inner posterior angle close to scutellum; abdomen rotund, usually with much reduced 

 chaetotaxy, often without any definite bristles; Ti + 2 excavate to hind margin; sutures 

 of abdomen distinct; intermediate abdominal tergites always without discal setae; sternites 

 widely exposed; $ terminalia modified for deposition of planidia. 



In Australia the Ormiini were unknown until Paramonov (1955) described two 

 species from Queensland and assigned them to the supposedly new genus Ormiominda 

 Paramonov. In an earlier paper (Crosskey, 19666) it was shown that Ormiominda 

 cannot be distinguished from the widespread Old World ormiine genus Therobia, 

 and the opinion given earlier that Ormiominda is a synonym of Therobia is here 

 upheld as undoubtedly correct. Therobia is the only genus of the tribe yet known 

 in Australia, but it is possible that Phasioormia Townsend occurs in north Queensland; 

 the latter genus occurs from Burma to Papua and may ultimately be found in 

 Australia (hence its inclusion in the key that follows). Finally it may be noted 

 here that Paramonov's species of Therobia from Queensland seem rather doubtfully 

 distinct, and it is also uncertain whether either or both are really separate species 

 from T. braueri (Kertesz) from New Guinea, T. vesiculifera Bezzi from Fiji, or 

 T. insularis Seguy from New Caledonia (some or all of which may well be synonymous 

 with each other). 



Key to Australian Genera of ORMIINI 



1 Epistome forming a long narrow strip running from the oral cavity to the antennal 

 apices and flanked on each side by broad flattened and rather evenly haired 

 facialia. No vibrissae. Antennae minute, length much less than a quarter of 

 eye-height, apices separated from the oral cavity by a distance very much greater 

 than their own length. Oral cavity extremely reduced and subcircular. Frons 

 of $ usually noticeably tapering towards the ventral end . . THEROBIA Brauer 



— Epistome normal, without such form. Vibrissae distinct. Antennae not excep- 

 tionally small, length greater than a quarter of eye-height, apices separated from 

 oral cavity by a distance less than their own length. Oral cavity not exceptionally 

 reduced, normally obviously longer than its width. Frons of 9 with parallel sides 



PHASIOORMIA Townsend 



