586 REVISIONAL NOTES ON AUSTRALIAN CARABID^, V., 



side of galea. Prothorax a little broader than long ; sides 

 ampliate and rounded at anterior two-thirds, strongly sinuate- 

 angustate to base ; basal angles near peduncle ; border reach- 

 ing base ; disc with three, indistinct, longitudinal ridges. 

 Elytra one-half wider than prothorax ; interstices biseriately 

 punctate towards base, eighth densely punctate. Anterior 

 tarsi wide ; penultimate joint short, wide, deeply emarginate. 

 Type, H. atruni Castelnau. 



Habits unknown to me, but, I believe, .terrestrial. 



An isolated terminal genus of ancient origin, containing two 

 species, //. atrum Cast., and H. longicolle Macl. 



Helluosoma atrum Castelnau. 



Trans. Roy. Soc. Victoria, viii., 1868, 107; Chaudoir, Rev. 

 &Mag. Zool., 1872, 216. 



H. atruni can be identified from the generic diagnosis given 

 above. Dimensions: length 15-5; proth., 2-75x3; el., 8x4-5 

 mm. 



Hah. — Tropical Australia, from Rockhampton to Pine Creek. 



H. LONGICOLLE Macl., Proc. Linn. Soc. N.S.Wales,(2), ii., 

 1887, 217. 

 T have seen the types of H. Ionf/icoIle in the Macleay 

 Museum, and have noted it as a species distinct from H. 

 atrum Cast., but without recording the differences; and I can- 

 not now indicate them. 



Genus Helluodema. 



Castelnau, Trans. Roy. Soc. Victoria, viii., 1868, 105: 

 Sinioglossus Chaudoir, Rev. & Mag. Zool., 1872, 217. 



Parallel, depressed, winged, black. Head punctate, con- 

 stricted to a neck behind ; one supraorbital sensitive hair on 

 each side ; eyes strongly enclosed behind in large orbits. An- 

 tennae short, compressed ; joints 1-3 cylindrical. Labrum large ; 

 anterior margin arcuate, slightly prominent in middle, 4- 

 setose. Mentum with a prominent, triangular, median tooth; 

 lobes triangular, pointed. Ligula wide, emarginate in middle 

 of apex. Palpi short, stout. Maxillae with inner lobe lightly 



