StapJtijlinidce of the Amazon Valley. 181 



the vertex; it is black and shining. Thorax about as 

 broad as tlie elytra, rather broader than long, a little 

 sinuate at the sides, and a good deal narrowed behind, 

 black and shining, and with a slight opalescent reflection, 

 bearing a few irregularly-placed, rather coarse punctures. 

 Scutellum rather large, coarsely punctured. Elytra pitchy 

 black, much longer than the thorax, rather coarsely and 

 closely but yet not densely punctured, distinctly shining. 

 Hind body I'ather broad and depressed, coarsely and rather 

 closely punctured, the 6tli segment more sparingly so, 

 and the yellowish 7th segment still more sparingly. 

 Legs shoi't and stout, pitchy. 



Ega ; a single individual. 



Obs. I. — A second individual, brought by Mr. Bates 

 from the same locality, may be either the other sex of 

 //. depressus or a closely allied but distinct species; it is 

 a little smaller, and has the head rather shorter and the 

 hind body not quite so closely punctured ; it has the hind 

 margin of the ventral plate of the 7th segment of the hind 

 body rounded, while this part is more truncate in H. de- 

 pressus. 



Obs. II. — H. depressus is very closely allied to H. anal is, 

 Er., but is rather larger and broader, has the thorax shorter 

 in proportion to its length, and the elytra less densely and 

 rather more coarsely punctured. 



2. Iloh'sns jncipes, n. sp. Parallelus, minus latus, 

 nitidus, niger, pedibus piceis; capite thoraceque vage, 

 elytris subtiliter minus crebre, abdo:aine fortiter, punc- 

 tatis. Long. corp. vix 3 lin. ; lat. h lin. 



Allied (judging from description) to H. humilis, Er., 

 but larger, and with the elytra mere finely punctured. 

 Antennae rather longer than the head, not stout; 3rd joint 

 distinctly longer than 2nd ; 5th joint about as long as 

 broad, 6 — 10 each a little transverse. Mandibles pitchy j 

 ])alpi dusky yellowish. Head oblong, straight at the 

 sides, the hind angles not much rounded, the length from 

 clypeus to vertex a little greater than the width; it is 

 black and shining, rather strongly and coarsely punctured, 

 the punctures being disposed as follows : a patch of about 

 seven on each side placed in an obscure depression behind 

 the antennre, and between these two patches two or three 

 other punctures; behind these a broad, longitudinal space 

 is impunctate, and at each side behind is a large patch of 



