828 DIPTERA OF AUSTRALIA, 



Genus 18. RhabdomastiX; gen.nov. 



Two submarginal cells, the first half the length of the second ; 

 four posterior cells ; no marginal cross-vein ; prsefurca long, 

 originating at an acute angle before the middle of the wing ; 

 discal cell small; wings glabrous. Antennae 16-jointed, very long, 

 Miform, nearly twice the length of the entire body. Legs long, 

 slender, tibiae without spurs at the tip ; ungues small, smooth ; 

 empodia indistinct. Male forceps with an outer, straight, slender, 

 horny appendage, microscopically serrated on the outer side, and an 

 inner short, soft, elliptical one ; also two long, slender, somewhat 

 hooked, internal appendages (PI. xxiv., tig. 57). 



Rostrum and palpi short ; antennae very long ; joints of the 

 scapus equal in size, very small, globose ; flagellar joints long, 

 slender, cylindrical, evenly but not densely pilose, somewhat 

 decreasing in length ; last joint apparently terminated by a minute 

 nipple-shaped projection. Front broad, convex ; eyes glabrous, 

 small, round, considerably separated on the under side. Collare 

 short ; suture of thorax very distinct. Hal teres long, slender. 

 Legs densely clothed with a minute pubescence. Wings very 

 cuneiformly narrowed towards the base, with only a slight indica- 

 tion of an anal angle ; glabrous, appearing as if covered with 

 microscopic dots under a high power ; veins glabrous, or almost 

 so; stigma wanting. The tip of the auxiliary vein is some dis- 

 tance beyond the origin of the second longitudinal vein ; the sub- 

 costal cross-vein wanting or only extremely indistinctly present at 

 the tip of auxiliary vein ; preefurca originating in a rather acute 

 angle considerably before the middle of the wing; first longitudinal 

 vein joining costa opposite distal end of discal cell ; the anterior 

 branch of the second longitudinal vein is short, shorter than the 

 great cross- vein ; petiole about one half the length of first sub-mar- 

 ginal cell ; marginal cross-vein entirely wanting ; inner ends of 

 second sub-marginal, first posterior and discal cells in one line ; 

 small or anterior cross-vein as long or somewhat longer than the 

 great cross-vein, almost as long as the discal cell ; discal cell small. 



