Staplit/lhildoi of tlir Ainazun Vallcij. 277 



opacus ; capite elongato, vertlce aiigusto ; tliorace medio 

 longitudinaliter carinato. Long. corp. 2^ lin. 



Antenna yellow, about as long as head ; 1st joint much 

 stouter and longer than the following ones, as long as the 

 three following joints together ; the two or three penul- 

 timate joints distinctly transverse. Mandibles very long 

 and slender, the upper of the two teeth in the middle very 

 long. Labrum with two widely-separate sharp teeth in 

 the middle, and sinuate and emarginate between them ; 

 lateral teeth indistinct. Head reddish, gradually narrowed 

 from the eyes to the vertex ; convex in the middle, so as 

 to give an appearance of two obscure anteriorly divergent 

 grooves ; the surface dull, densely and intricately punctured, 

 with the interstices extremely fine. Thorax elongate and 

 narrow, hardly half so broad as the elytra, quite twice as 

 long as broad ; the greatest width in the middle, thence a 

 good deal narrowed towards the front and slightly towards 

 the base, pale reddish-yellow, closely but indistinctly 

 punctured, dull ; along the middle with a broad longi- 

 tudinal elevation, and depressed on either side of this. 

 Elytra about as long as the thorax, blackish, with the 

 basal portion pale yellow, densely and roughly but not 

 coarsely punctured. Hind body elongate and narrow, 

 very pointed, yellowish, Avith the extremity darker, and on 

 the side of each segment a small, indistinct, dark mark ; 

 the basal segments rather coarsely and roughly punctured. 

 Legs pale yellow. 



Tapajos ; a single female. 



This species at first sight resembles E. signnUis ex- 

 tremely, but is abundantly distinct by the structure of the 

 labrum and the carinate thorax. 



5. Echiaster latifrons, n. sp. Latior, piceus, antennis, 

 palpis, pedibusque testaceis ; capite lateribus rotundatis, 

 vertice angusto ; prothorace elongato, bisulcato; elytris ab- 

 domineque fortiter asperato-punctatis. Long. corp. 2| lin. 



Antennte reddish-yellow, rather longer than the head ; 

 1st joint very stout, quite as long as the two following 

 together ; 3rd joint more slender than 2nd ; 4th and 5tli 

 slender, each longer than 2nd, differing little from one 

 another ; 6th shorter than 5th, 7th shorter than 6th, about 

 as long as bi'oad ; 8 — 10 slightly transverse, 11th acumi- 

 nate at the extremity. Mandibles reddish. Labnmi with 

 four sharp approximate teeth in the middle. Head broad, 

 quite as broad as the elytra, suborbiculate, with the sides 



