220 Mr. H. W. Bates on the Longicorn Coleoptera 



on the sides behind the middle, and constricted between that 

 point and the base. The elytra are gradually attenuated from 

 base to apex, and the latter is rather obliquely truncated, with 

 the external angle alone produced into a spine. The scutellum 

 is black, with a yellow spot at its tip. The apex of the elytra is 

 ashy white, and there is also a white dot on the disk not far 

 from the apex. Besides the yellow line on each extending from 

 the base to the middle and the sutural streak, there is also a 

 yellow dot near the suture, a short distance behind the scutellum. 

 The white ring at the base of the sixth antennal joint is obsolete 

 in the female. The body beneath is clothed with grey pile, and 

 has an ochreous-ashy streak of denser pile on each side. The 

 terminal antennal joints are much longer in the male than in 

 the female, and there is but little sexual difference in the form 

 of the terminal abdominal segment. 



I met with the species at Ega on the Upper Amazons, and 

 not at Para, as erroneously recorded by Mr. Pascoe. 



6. Coloboihea dioptica, n. sp. 



C. brevis, lata, convexa, brunuea, supra nullomodo setosa, thorace 

 prope basin utrinque tuberculo acuto, deinde subiter angustato ; 

 elytris pone medium macula rotundata atro-velutina flavo cincta. 

 Long. 4^ lin. c? $ . 



Head black, vertex grey. Antennae pitchy, bases of the 

 middle joints slightly grey. Thorax widened from the front to 

 near the hind margins, and each side forming at that point an 

 acute prominence, after which it is suddenly narrowed to the 

 base ; surface brown, varied with indistinct lighter brown marks. 

 Scutellum dark brown, with a central tawny-ashy spot. Elytra 

 short, broad, and convex, shoulders forming a short and very 

 prominent ridge, the lateral carina proceeding thence being 

 scarcely elevated, and disappearing before the middle of the 

 elytron ; apex truncated in a slightly flexuous line, sutural angles 

 rounded off, external angles produced into a short and broad 

 tooth : surface free from setae, brown, speckled with light tawny 

 brown, and each elytron having, behind the middle, a large round 

 velvety-black spot encircled with yellow. Body beneath black, 

 clothed with grey pile; sides of abdomen spotted with grey; 

 terminal segment shining black. Legs black or reddish, ringed 

 with grey. Fore tarsi simple in both sexes. 



6 . Terminal ventral segment deeply notched ; dorsal broad 

 and obtuse. 



$ . Terminal ventral segment simply truncated ; dorsal taper- 

 ing and obtuse. 



On slender dead twigs in the forest ; Para and banks of the 

 Tapajos. Rare. 



