BY THOMAS G. SLOANE. 567 



A very distinct species. Adopting the tabulation of the Aus- 

 tralian species of Tachys which I have given in P.L.S.N.S.W. 

 1896, pp. 356-359, its place would be with those species which 

 have the submarginal stria obsolete on the sides of the elytra; it 

 would come nearest T. ovatus, MacL, from which it differs greatly 

 by its larger size, less convex form, and the elytra more than 

 unistriate on each side of suture. 



Tribe FERONINI. 

 Genus H o M A L o s o M a. 



Table of Sjjecies. 



I. Sinus of mentuni paisllel on sides. 



1. Form very short; prothorax subquadrate, 



strongly emarginate at base, margins 

 widely explanate and acclivous ; elytra 

 short, vei'y convex, iuterstices not carinate, 

 third inipunctate, humeral angles widely 

 rounded ; prosternum and mesosternum 

 setigero-panctate. R. curtum, Chaud. 



2. Form wide and heavy ; head very large; 



elytra with interstices not carinate, basal 

 border prominent at, humeral angles; pro- 

 sternum setigero-puuctate, mesosternum 

 glabrous. 

 a. Prothorax lightly narrowed to base, apex 

 and t)ase of same width, posterior angles 



obtuse H. (:ra<:sifoyme, SI. 



«a. Prothorax strongly narrowed to base, 

 wider across apex than base, posteiior 

 angles marked. 

 h. Head and prothorax splendid brassy- 



gi'een H. imperiale, SI. 



hh. Head black, prothorax only metallic 



towards margin H. breve, Motsch. 



3. Elytra with at least seventh interstice cari- 



nate. 

 C. Mentuin with median tooth rounded at 

 apex; prothorax wide at base, posterior 

 marginal puncture at each l»asal angle; 

 elytra with basal border dentate at 

 humeral angles, ninth interstice narrow 

 and raised posteriorly; prostei-num and 

 mesosternum setigem-punctate (nietas- 

 ternum setigero-punctate at each side). 



