592 REVISIONAL NOTES ON AUSTRALIAN CARABID^, V., 



punctate (on head, prothorax, peduncle, metepisterna, posterior 

 coxae and abdomen). Length 30 mm. 



Hah. — Shark Bay. (One specimen from Mr. French). 



This may be a distinct species; but having only one specimen, 

 and thinking it possible that forms connecting it with H. niger 

 may be found, I have put it tentatively under H. niger, as a 

 variety. 



Helluarchus, n.g. 



Oval, body very large; apterous. Head large; neck wide; 

 eyes prominent; postocular parts of orbits small, oblique to neck. 

 Antennae stout, not incrassate ; four basal joints cylindrical, 

 sparsely punctate, third as long as basal joint, second three- 

 fourths length of third. Labrum large, depressed, rounded at 

 apex, punctate (except near base); one sensitive seta on each side 

 near anterior angles. Mentum punctate; sinus with a short, 

 wide, median prominence; lobes not long, triangular. Ligula 

 cordate, oblique on each side and roundly obtuse at apex. Palpi: 

 labial with apical joint stout, cylindrical, truncate; maxillary 

 with penultimate joint two-thirds length of apical; this stout, 

 truncate, a little larger than apical joint of labial. Maxillae 

 with inner lobe stout, strongly hooked at apex ; inner side 

 sparingly spinose; a prominent, triangular, median prominence. 

 Prothorax transverse, strongly ampliate at widest part, strongly 

 sinuate-angustate to base. Elytra inflated, oval, depressed on 

 disc, striate, rounded at apex; fifth interstice costate, bordering 

 the depressed discal area ; sides and apex sharply declivous ; 

 inflexed margins wider and more sparsely setose than usual in the 

 tribe. Metasternal episterna shorter than usual (4 x 2*5 mm.). 

 Tarsi stout; joints sparsely setose; fourth joint widely triangular, 

 hardly emarginate at apex. Habits terrestrial. 



The strangely shaped elytra of Helluarchus, which are those 

 of an integripenne and not of a truncatipenne, make this one 

 of the most abnormal forms to be found amongst the Carabi- 

 dse, and place it quite by itself. Its affinity is evidently to- 

 wards Helluapterus. In general appearance, Z^. robustus re- 

 sembles the genus Cuneipectus. 



