44 RHINOTJIETUS. 



the apex to the base ; the surface, when seen under a high magni- 

 fying power, finely punctate, glabrous, black. Scutellum small, tri- 

 angular, black. Elytra robust, broader than the thorax, and sub- 

 parallel ; from the antemedial suture a well-defined and somewhat 

 deep depression extends obliquely upwards towards the humeral 

 angles, giving an appearance of prominence to the surface near the 

 scutellum (this depression is more distinctly impressed than in R. 

 cyaneus and R. assimilis) : the surface is covered throughout with 

 punctures arranged in the form of striae ; these punctures are tolera- 

 bly deep and apparent. Antennce robust, filiform, of a fuscous-black 

 colour. Leys robust, clothed more or less sparingly with pale fuscous 

 pubescence ; black, the posterior tibiae and tarsi being suffused with 

 piceous. 



Closely allied to the two former species ; but abundantly separated 

 from either by its smaller size, by the distinct obliquely transverse 

 depression on the elytra, and by the absence of any striae on the 

 elytra. 



This species was taken by Mr. Gray and myself at Constancia, in 

 the Organ Mountains, in January 1857. It has been taken by 

 Mr. Fry and other collectors also in the neighbourhood of Rio Janeiro. 



9. Rhinotmetus Waterhousii. 



R. oblonyo-ovatus, elongatus, parallelus, nigro-cyaneus ; capite valde 

 producto, ad apicem longitudinaliter carinato, ylabrato, superne 

 granulate, rufo-fusco ; thorace elongate, antice rotundato, im- 

 punctato,fusco ; elytris sulyparallelis, punctis veluti in striis ordi- 

 natis, ante medium transverse depressis, nigro-cyaneis, nitidis ; 

 antennis robust is, nigris ; pedibus nigris, femoribus nigro-fuscis. 



Var. A. Capite et tliorace nigris. 



Long. corp. 2\ lin., lat. 1 lin. 



Oblong-ovate, subcylindrical, elongated, sides parallel, of a dark- 

 blue colour. Head considerably produced; eyes large, prominent, 

 extending laterally beyond the apex of the thorax ; from the upper 

 lip a longitudinal acute ridge extends medially upwards to the inser- 

 tion of the antennae, and there (above the insertion) terminates in a 

 V-shaped fork ; surface of the head above finely granulated, darkly 

 rufous. Thorax elongate, broader than the head, rounded and de- 

 pressed anteriorly ; sides slightly marginate ; surface with a very 

 slight medial longitudinal fovea, impimctate, very darkly rufo- 

 fuscous. Scutellum small, obscure, darkly fuscous. Elytra oblong, 

 parallel, subconvex, with punctures arranged in the form of striae ; 

 an antemedial transverse shallow depression extends obliquely to- 

 wards the shoulders, giving the appearance of prominence to the 



