Staphi/liiddcB of the Amazon Valley. 87 



rounded ; tlie base scarcely sinuate, smooth, sliinlng and 

 inipunctate ; the lateral margins pitchy. The elytra are 

 nearly black, longer than the thorax, very finely punc- 

 tured, without impression near the side ; the hind angle 

 a good deal rounded. 



In the male the dorsal plate of the 7th segment ends in 

 four almost equidistant spines, of which those in the middle 

 are the more slender, and a good deal the longer; the 

 ventral plate bears a deep angular notch, the sides of 

 which are a good deal produced, so as to form projecting 

 teeth. 



Ega ; two male specimens. 



Obs. — This species appears to be extremely closely 

 allied to C. politus, and has the mesothoracic carina 

 similar, but the antenna are entirely pale ; I am sorry 



1 am unable to compare the sexes of the two species. 



8. Cojn-oporus ic/navus, n. sp. Sat convexus, nitidus, 

 piceus, antennis basi rufo, articulo ultimo apice testaceo, 

 pedibus rufis ; prothorace basi utrinque leviter sinuato ; 

 elytrorum angido externo sat rotundato. Long. corp. 



2 lin. 



AntennfB moderately long, rather slender, but a good 

 deal thickened towards the extremity; the three basal 

 joints yellow, the following ones pitchy, the extremity of 

 the 11th yellow ; 3rd joint fully as long as 2nd ; 4th joint 

 longer than broad ; 10th very nearly as long as broad. 

 Thorax very transverse, the hind angles a little rounded 

 but not produced, the base a little sinuate on each side ; 

 it is of a pitchy colour, with the sides paler, almost ini- 

 punctate. Elytra very finely and not closely punctured, not 

 impressed at the sides, the hind angle moderately rounded. 

 Hind body pitchy, paler towards the extremity, rather 

 closely and distinctly punctm-ed. Legs red. 



In the female the dorsal plate of the 7th segment ends 

 in four elongate spines; the middle ones are the more 

 slender, they are a little longer than the lateral ones, and 

 the space between them is not quite so broad as that 

 between them and the side spine ; the three spaces extend 

 about equally far forward ; the ventral plate ends in four 

 spines about equally stout ; those in the middle are distinctly 

 longer than the side ones, and the space between them is 

 scarcely so broad as that between them and the lateral 

 spine ; the middle space does not extend so far forward as 



