BY T. G. SLOANE. 571 



^rtfe. — Queensland, Java, Ceylon. 



C. wilsoni Cast., from Brisbane, is unknown to me. Gestro 

 described it, and gives a figure of the prothorax, showing the 

 sharply marked basal angles of the prothorax; he gives the length 

 as " lOi mm."(^.c , pp.869, 872). 



n. Australian group. — Table of Genera. 



1(10). Head with large postocular prominences. 



2(5).Labruni convex, apex pointed and with more than 

 four sensitive hairs; clypeus emarginate. 



3(4). Mentum with strong triangular median tooth; ligula 



rounded atapex Helluonidius. 



4(3). Mentum edentate. Ligula furcate. (Colour cyane- 



ous) Dicranoglossus. 



5(2).Labrum depressed, apex widely rounded, never with 

 more than four sensitive hairs; clypeus truncate. 

 (Mentum with triangular median tooth. Colour 

 black). 



6(9).Labrum with four sensitive hairs. 



7(8) Prothorax strongly sinuately constricted to base; 

 ligula narrow, elongate, rounded at apex; maxillse 

 not extending forward bey«)nd apical hook Helluosoma. 



8(7). Prothorax lightly narrowed to base; ligula wide, 

 short, emarginate at apex; maxillae with apex pro- 

 jecting beyond hook Helluodema. 



9(6).Labrum bisetose. (Ligula wide, emarginate at apex) Epimicodema. 



10(1). Head with postocular prominences small or obsolete. 



11(16). Apterous ; inetasternum shorter between middle 



and posterior coxal cavities than length of posterior 



coxse, episterna short, wide posteriorly ; elytra 



with ninth interstice not disproportionately narrow 



in comparison with eighth. 



12(13). Mentum with lobes elongated to a point at apex, 



median tooth triangular; maxilhe with inner side 



not protuberant in middle; elytra with third, fifth, 



and seventh interstices costate, or carinate Helluo. 



13(12). Mentum with lobes ordinary, median tooth short, 

 wide; maxillse with a strong triangular median pro- 

 minence on inner side; elytra with interstices not 

 costate. 

 14(15). Elytra rounded at apex, depressed on disc, strongly 



declivous to sides and apex Helluarchus. 



15(14).Elytra truncate, gently convex Helluapterus. 



