682 REVISIONAL NOTES ON AUSTRALIAN CARABIDiE, V., 



form convex, pointed {Helluonidius and Dicra7ioglossus). Mentum 

 with epilobes developed into strong mucrones {e.g.^ Gigadeina 

 longipenne). Ligula setose on sides, form deeply furcate. Max- 

 illce with galea prominent at apex. Legs : anterior femora with 

 an antebasal prominence; tibiae long, with notch towards distal 

 end. Secondary sexual chdracte7^s of ^\ mandibles often very 

 long; submentum armed [e.g., G. grayide Macl.); maxillae with 

 cardo strongly triangularly prominent at external angle (6^. max- 

 illare SI.) ; pro thorax protuberant {G. grande) ; elytra with 

 humeral angles dentate {jEnigma). 



Genus Helluonidius. 



Chaudoir, Rev. &Mag. ZooL, 1872, 216; Helluosoma Castelnau, 

 (partim). Trans. Roy. Soc. Victoria, viii., 1868, 107. 



Winged. Setosity white. Head convex, sharply narrowed to 

 neck; eyes large, convex, enclosed at base in large setose orbits; 

 one supraorbital sensitive hair on each side. Clypeus emarginate, 

 oflabrous in middle, two sensitive hairs on each side. Labrum 

 long, convex; middle of anterior margin triangularly prominent; 

 a fine hair-like seta on each side of median prominence, a larger 

 seta at each anterior angle of labrum. Mentum with lobes short, 

 wide; epilobes forming the short, stout, pointed apex; median 

 tooth wide, triangular, prominent. Ligula rather narrow, con- 

 vex, rotundate at apex. Palpi elongate; labial with apical joint 

 lightly securiform, shorter than penultimate. Maxillae with 

 inner lobe a little inflated on inner side opposite origin of outer 

 lobe. Prothorax punctate, ampliate and rounded on sides ante- 

 riorly, strongly sinuate-angustate to base; disc with three indis- 

 tinct longitudinal ridges. Elytra striate; interstices not raised 

 or nitid in middle, closely punctate, third with a row of widely 

 spaced dorsal punctures. Tarsi setose; penultimate joint bilobed. 

 Type, Enigma cyanipeiine Hope. 



The genera Helluonidius and Dicranoglossus form a little 

 terminal group, derived from the primitive Australian Helluonini 

 along a different line of descent from any other of the present- 

 day genera. These two genera have been placed first in the 

 Table of genera given in this paper, because of their extreme 



