418 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



be regarded as a species of Trichosternus. Loxodactylus is a 

 more distinctive group than the other two, but I cannot find 

 sufficient grounds for constituting it a genus separate from 

 Homulosoma. 



Synoptic Table of the Species of Homalosoma knoion to rue. 



I. Basal border of elytra forming a dentiform projection at 

 humeral angles. 



A. Prosternum witli base setigero-punctate ; mesosternum 



glabrous. 

 Head and prothorax of a splendid brassy green colour. 



//. imjjeriale, kSl. 

 Head black, prothorax only metallic towards margin 



//. breve, Motsch. 



B. Prosternum (at base) and mesosternum setigero-punctate ; 



colour ])lack 



H. renardi, Chaud.; H. vigorsi, Crory; H. alternans, SI.* 



Black, prothorax and elytra margined with green 



JJ. aii'ji(,losum,'\ Chaud. 



C. Prosternum and mesostei'num glaljrous. 



d. Elytra with 3rd, 5th and 7th interstices strongly 



carinate, others weakly developed. 



e. Ninth interstice of elytra obsolete, merged with margin. 



Elj^tra obovate, widely rounded at apex; a wide light 



sinuosity at each side of apical curve 



//. viridescetiis, Casteln. 



Elyti'a oval, nai'row at apex, apical curve without any 



sinuosity H. wilsoni, Castln. 



ee. Ninth interstice of elytra narrow, plainly indicated on 

 posterior third (elytra strongly declivous behind, apex 

 widely rounded without any sinuosity; prothorax of a 

 brassy colour) H. idtidicolle, Casteln. 



*For differences between tliese three species .see description of 

 H. cdternans, p. 423. 



t Hah. — Richmond River, N.S.W. ; its e.xact habitat has not before 

 been recorded. 



