of the Amazon Valley. 149 



but M. Chevrolat (/. c. p. 188) states that this is an error, the 

 species being from Cayeane, and identical with Cosmotoma ve- 

 nustulum of Dejean's Catalogue. 



Genus Stenolis, nov. gen. 



Body elongate, slightly convex, free from setse. Forehead 

 short. Antenna elongate, slender, furnished with short setse. 

 Thorax somewhut narrow; lateral spines existing as minute 

 tubercles at a distance from the hind angles. Elytra smooth, 

 truncated. Thighs clavate j basal joint of the hind tarsi about 

 equal to the two following taken together. Apical abdominal 

 segment in the males (the only sex known) somewhat elongated, 

 rounded, and entire at the tip ; the ventral plate with a longish 

 pencil of hairs on each side. 



The single species constituting this genus cannot be included 

 in any of the allied genera, on account of its peculiarities in the 

 form of body and shape of the terminal apical segment of the 

 abdomen. In form it agrees pretty well with certain species of 

 Nyssodrys [N. guttula and allies), but differs from them in the 

 apical segment of its abdomen being entire. With Lepturges it 

 has in common the entire apical segment ; but the very different 

 shape of the body and thorax forbids its being included in that 

 group. The pencils of hairs at the tip of the abdomen may be 

 only a specific character. 



Stenolis undulata, n. sp. 



(S. elongata, gracilis, cano-grisea : elytris fascia undulata pone 



medium et maculis utrinque duabus lateralibus brunneis. Long. 



3ilin. c?. 



Forehead dark brown, inner margins of the eyes grey ; vertex 

 grey, with two blackish lines. Antennae furnished beneath with 

 short setse, reddish, tips of joints dusky. Thorax gray. Elytra 

 elongate-ovate, apex obliquely subsinuate-truncate, the angles 

 slightly produced: surface even, finely punctured (except to- 

 wards the apex), hoary grey, with a clear dark-brown zigzag 

 fascia behind the middle, a curved line of the same colour near 

 the scutellum, and two lateral spots — one, large, before the 

 middle, and another, smaller, near the apex. Body beneath and 

 legs clothed with hoary-grey pile. 



One example, taken at Ega. 



Genus Nyssodrys, nov. gen. 

 Body free from setse, oblong-ovate or elongate. Forehead 

 and muzzle short ; eyes ample, their lower lobe subquadrate. 

 Antennae greatly elongated, sparingly furnished with setse 



