CRYPTOSTOME BEETLES. - 579 



species of this division require a very accurate exainination ; 

 none of my acquaintance accord altogether with the above 

 generic characters ; they requii-e, therefore, further division ; 

 the typical insect is from the • Brazils." Boheman, the next 

 writer on the genus who described monstrosa and denticula under 

 Desmonota (Mon. Cassid. i. 1850, pp. 144 & 141), evidently did 

 not examine the specimens carefully or he would have been 

 struck with the differences in the structure of the antennae. 



Oma denticula Boh., var. kbishna, n. 



The specimen before me agrees well with denticula, but the 

 colour of the dorsal side is dark. As I cannot find any struc- 

 tural dilFerence, I make this specimen the type of the new 

 variety krishna. 



Desmonota variolosa F., which is green in colour, has a similar 

 dark variety. The occurrence of a dark variety in these allied 

 genera is therefore not uncommon. 



Locality. — South America, 25. i. 94. 



It has been reported from Paraguay, Bolivia. 



Type of variety in the British Museum. 



Genus Prenea Spaeth. 



Prenea strigata Panz. 



Cassida strigata Panzer in Voet's Beschreib. u. Abb. hartsch. 

 Ins. 1798, p. 81, t. 42. f. 10. 



Dolichotovia strigata Boheman, Mon. Cassid. i, 1850, p. 202. 



Cassida similis Panzer, 1. c. p. 81, t. 42. f. 11 ( $ ). 



8 examples. 



Locality. — Amazons (Goodman, 1879). 



Ilange. Amazons, Ecuador. 



Genus Oxynodera Hope. 



OXYNODERA COLLICULUS Boh. 



Dolichotoma colliculus Boheman, Mon. Cassid, i. 1850, p. 189. 



1 example. 



Locality. — Amazons {Goodman, 1879). 

 It has been reported from Para. 



Genus Canistra Er. 

 Canistra irrorata Guer-in. 



Oxijnodera irrorata Guerin, Icon. Regne Anim., Ins. 1844, 

 p. 289. 



Canistra irrorata Boheman, Mon. Cassid. i. 1850, p. 168, 

 t. 3. f. c. 



2 examples. 



Locality. — Amazons {Goodman, 1879). 

 Range. Bi'azil, Misiones, Bolivia, Pai'aguay. 



