of the Amazon Valley. 149 
but M. Chevrolat (J. c. p. 188) states that this is an error, the 
species being from Cayenne, and identical with Cosmotoma ve- 
nustulum of Dejean’s Catalogue. 
Genus STENOLIS, noy. gen. 
Body elongate, slightly convex, free from sete. Forehead 
short. Antenne elongate, slender, furnished with short sete. 
Thorax somewhat narrow; lateral spines existing as minute 
tubercles at a distance from the hind angles. Elytra smooth, 
truncated. Thighs clavate ; 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. i 
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, u. sp. 
S. elongata, gracilis, cano-grisea: elytris fascia undulata pone 
medium et maculis utrinque duabus lateralibus brunneis. Long. 
io, lin. 
Forehead dark brown, inner margins of the eyes grey ; vertex 
grey, with two blackish lines. Antenne furnished beneath with 
short set, reddish, tips of jomts 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 NyssopRrys, nov. gen. 
Body free from sete, oblong-ovate or elongate. Forehead 
and muzzle short ; eyes ample, their lower lobe subquadrate. 
Antenne greatly elongated, sparingly furnished with sete 
