CRYPTOSTOME BEETLES. 



583 



represented in the British Museum Collection, and these I have 

 examined. The genus Batonota may be divided as follows : — 



A. Scutelluin trapezoidal. 



1. The elj'tra produced into a long dorsal double . 

 spine, the lateral sides of the elytra concave at 



the middle Batonota Hope. 



1'. The elytra not prodiiced into a long spine, dor- 

 sally gibbous, the lateral sides of the elytra 

 convex or straight, more explanate A]cantaTca\, gew.wci'V. 



A'. Scutellum triangular. Insects small, ovate; elytra 



dorsally more or less gibbous, deeply punctate ... TrihonaX, gen. nov. 



The species are distributed as follows :- 



Genus Batonota. 



hidens P. 



nigra Boh. 



monoceros Germ. 



pugionata Germ. 



pugnax Boh. 



cornigera Boh. 



mucronata Boh. 



aurita Boh. 



parallela Blanch. 



ensifera Boh. 



spinosa Boh. 



apiculata Boh. 



acideata Boh. 



yiicatana Champ. 



nodosa Boh. 

 *rufomarginata Wgenr. 

 *rugosa Wgenr. 

 *minima Wgenr. 

 *bellicosa Boh. 



Genus Akantaka. 



funesta Boh. 



truncata Fab. 



peregrina Boh. 



godmani Bal}'. 



viridisignata Boh. 



exaltata Fab. 



dejeani Boh. 



bivittipennis Boh. 



rufoornata Baly. 



l-iesenivetteri Boh. 



coUaris Baly. 



tenehrosa Boh. 



distincta Baly. 



sexplagiata Wgenr. 



hiplagiata Champ. 



insidiosa Boh. 

 *kunzei Boh. 

 *marginevittata Wgenr. 

 *ceneocincta Spaeth. 

 *fasciata Wgenr. 



G^nus Teikona. 

 turrifera Boh. 

 humeralis Oliv. 

 lerouxi Boh. 



In the above list I have not seen the species marked with an 

 asterisk, but I have placed them in their respective genera with 

 the help of Wagener's table (Mitt. Miinch. Ent. Ver. v. 1881, 

 p. 44). Batonota nodosa Boh. appears to be an intermediate 

 form. The shape of the body is similar to some forms of 

 Akantaka, but the double spine on the back (which is rather 

 short) decides its position in Batonota. 



Akantaka rufoornata Baly, var. amazonensis, n. 



1 example. 



I have exatiiined six specimens of the species including the 

 type. They are all from Nicaragua. The present example is 

 the Brazilian variety of this species. Var. amazonensis is (1) 

 larger, (2) the lateral sides of the elytra are more convex at the 



f Akantaka is a Sanskrit word meaning "without thorn.' 

 X Trikona is a Sanskrit word meaning "triangular." 



