34 Mr. F. P. Pascoe on some new or little-known 
thickened but shorter, the third as long as the first, the remainder to 
the eighth shorter and more or less transverse, the three last forming an 
ovate, compact club; maxillary lobes narrow, fringed; mentum sub- 
quadrate, rounded in front; labium transverse, narrower behind ; ter- 
minal joint of the maxillary palpi ovate-triangular, of the labial ovate, 
obtuse; prothorax somewhat quadrate, but with the sides contracted in 
the middle, produced at the anterior and slightly emarginate at the 
posterior angle, the margin rather dilated, especially anteriorly, and 
serrulate, the disk finely granulated; an elevated line on each side, 
which are nearly parallel in front, then slightly diverging, after which 
they approach to form a V-shaped mark, without however becoming 
connected, each then encloses a lozenge-shaped cavity and terminates at 
a short distance from the base; outside the line the prothorax is rather 
concave, with a slight ridge posteriorly; elytra with five strongly 
marked cost, the intervals broad, with a double row of coarse punc- 
tures; body beneath dark chestnut-brown, reticulate-rugose; legs 
rather slender; tibize gradually thicker towards the extremity and 
slightly spurred ; tarsi short, the first three joints nearly equal. Length 
2-3 lines. 
Nematrpivum [ Colydiidee]. 
Erichson, Naturg. der Ins. Deutschl. i. p. 275. 
Nematidium mustela. (Pl. III. fig. 10.) 
N. ferrugineum; capite antice subdepresso; elytris striato-punctatis. 
Hab. Rio; Para. 
Linear, elongate, ferruginous; head finely punctured, moderately 
convex, somewhat flattened in front, the eyes rather large, black ; pro- 
thorax half as long as the elytra, finely punctured, the sides slightly 
incurved ; scutellum small, rounded; elytra striate-punctate, the in- 
tervals also punctured mostly in an irregular row ; body beneath finely 
punctured ; legs luteous testaceous. Length 23-35 lines. 
I have no hesitation in considering the insect just described a 
Nematidium, a genus founded on the Colydium cylindricum, Fab., 
and which, but for the expression “ elytris levissimis,” might have 
been identical, so far as his short description goes. Whether the 
Nematidium costipenne, J, du Val, really belongs to the genus is, I 
think, doubtful. I have another Nematidiwn among Mr. Bates’s 
Amazons Colydiide *, which differs from the above principally in 
its more slender form, shorter and more convex head, and elytra 
more than twice as long as the prothorax. Like Colydium, the first 
abdominal segment is nearly as large as the succeeding one. My 
description is drawn up from the largest of the two specimens now 
before me, which is from Rio, and belongs to Mr. Fry. 
* The Colydiide of this collection will form the subject of a distinct paper. 
