90 Mr. Arthur M. Lea's Eevision of the 



The hind tibiae * at once distinguish from all previously 

 described species, in general appearance it is something 

 like Trichahis nuhicollis. The dark j^ortion of the pro- 

 thorax, though alike in both specimens before me, appears 

 to be of the nature of a stain only, on the elytra the dark 

 portion is slightly advanced on the suture. 



Genus Trichalus, f Wat., Trans. Ent. Soc. Lond., 1877, 

 p. 82 ; 1878, p. 103 ; 111. Typ. Col, p. 67 ; Blackb., 

 T. R. S., S.A., 1894, p. 208; 1900, p. 51; Lea, P. L. S.. 

 N.S.W,, 1898, p. 556. 



Xantheros, Fairra., Journ. Mus. Godeffr., 1879, p. 99. 



This subgenus oi Metriorrhynchus is readily distinguished 

 by the prothorax having a single discoidal lanceolate 

 areolet J and the sutural costa of elytra trifurcate at base.§ 

 As pointed out by Blackburn there is nothing to dis- 

 tinguish Xantheros from it ; there certainly is not in the 

 two species described by Fairmaire, with which I am 

 acquainted. 



I am acquainted with all tlie Australian and Tasmanian 

 species except the following : — 



Serraticornis, Fab. This must be very close to sulcatus. 



Ochrcatus, Fairm. This should be distinct on account of 

 its black prothorax and black apex of elytra. 



The others may be tabulated as follows : — 



A. Discal areolet of prothorax double . . . iiisignis, Lea. 

 A A. Discal areolet single. 



B. Sutural costa bifurcate at base .... bifurcatus, n. sp. 

 BB. Sutural costa trifurcate. 



C. Entirely black ater, Macl. 



CC. Not entirely black. 

 D. Prothorax black. 



a. Elytra entirely pallid .... seinkostatus, Blackb. 

 aa. Elytra more or less infuscate in 



places dincoideus, Er. 



aaa. Elytra pallid at apex .... fnnereus, Blackb. 



* The projections, however, are probably confined to the males. 



f I have examined the type of Calopteron amplipennis, Macl., from 

 New Guinea ; it is quite an ordinary Trichahis with the subsutural 

 costa trifurcate and prothorax triareolate. 



X Except in itisigids. 



§ Except in bifurcatus. 



