Heterucera from the Australian Region. 



389 



COSSID^. 



ACKITOCERA, n. g. 

 Nearest to the S, American genus Langsdorfia, but with some- 

 what the aspect of a Notodont; primaries with the costa nearly 

 straight, apex rounded ; outer margin obhque, very shghtly con- 

 vex, rounded off at external angle ; inner margin incurved at base, 

 otherwise nearly straight; all the veins separate; costal vein 

 extending to a little beyond the middle of the margin, subcostal 

 five-branched, emitting its lirst branch at about half-way between 

 the base and apex; a httle beyond this the vein runs obliquely 

 downwards and emits its other fom- branches near together, and at 

 about equal distances apart ; upper radial emitted near to the fifth 

 subcostal branch from the end of the cell, having the appearance 

 of a sixth branch ; the lower radial also bears a similar relation to 

 the third median branch, the second and third median branches 

 and the lower radial being equidistant; disco-cellular vemlet 

 zigzag, emitting two short recurrent veins ; submedian vein slightly 

 curved outwards towards the base ; secondaries with long and very 

 shghtly curved frenum; costal margin rather deeply sinuated 

 towards the base and convex in the middle ; apex rounded ; outer 

 margin slightly convex ; abdominal margin short, rounded off at 

 anal angle ; costal vein nearly straight, very slightly arched, very 

 thick towards the base ; subcostal vein slender, shghtly arched to 

 end of cell and then straight to apex, simple, its second branch 

 having passed round to the end of the cell and thus become an 

 upper radial ; lower or true radial emitted near to the third median 

 branch, thus having the aspect of a fourth branch ; disco-cellulars 

 unequally zigzag, emitting one short recurrent vein ; third median 

 emitted from the inferior angle of the cell, second branch running 

 close to the main vein for a considerable distance towards the base, 

 first branch emitted near to the base, sinuous towards its origin ; 

 submedian and internal veins widely separated ; body very robust ; 

 head broader than long, with a keeled fi-ontal crest ; eyes large and 

 prominent ; palpi broad, with closely appressed scales, apical joint 

 deflexed ; antennse reaching to about the middle of costa, broadly 

 plumose in front, disordered, basal joint tufted, thorax broad, less 

 convex than in most Cossidce above ; legs very thick, middle tibiae 

 terminating in a long spur, posterior tibite with two subterminal 

 and two terminal spurs ; abdomen broad, tapering and somewhat 

 flattened, especially towards the anal extremity; anal tuft very 

 small. 



