of the Amazons Valley. 93 
front, the eyes rather large, black ; prothorax less than half the length 
of the elytra, finely punctured, the sides incurved; scutellum small, 
triangular ; elytra striate-punctate, the punctures rather minute, the 
interspaces slightly punctured; body beneath finely punctured; legs 
pale ferruginous. Length 1} line. 
A still more slender form than Nematidium mustela, the head 
shorter and very convex, the elytra longer in proportion to the pro- 
thorax, and the scutellum triangular and more depressed. 
Bothrideres latus. 
Pascoe, huj. op. i. p. 109. 
This species in size and outline resembles the Australian Bothri- 
deres illusus ; but the prothorax with its deeply impressed discal line, 
including a bilobed or transversely cordate space, and tricostate on 
each side, will distinguish it from all other described species. Indeed, 
the last character renders it doubtful whether it ought not to form 
a distinct genus. The only specimens I have seen were taken at 
Santarem, under bark. 
Bothrideres succineus. 
Pascoe, huj. op. i. p. 108. 
Another well-marked species, and at once distinguished from all 
other Colydians by the presence of two pellucid amber-coloured 
tubercles on the centre of each elytron. It should probably also 
constitute a new genus. I omitted to mention the tibie in my 
description ; they are robust, strongly toothed along the external 
edge, and the anterior decidedly trigonate, with a strong curved 
spine at each of the two distal angles. It occurs at Rio as well as 
at Ega. 
Sosylus sulcatus. 
Pascoe, huj. op. 1. p. 109. 
This species is at once separated from the rest of the genus known 
to me by a delicate median line on the prothorax, terminating be- 
tween two shorter impressed lines at the base. A slight approach 
to this structure is seen in a small and shallow impression in Sosylus 
terebrans, in two short but almost obsolete lines in Sosylus dupl- 
catus, and an almost obliterated semilunar mark in Sosylus castaneus 
and S. exilis, Another species, from Rio, has the front of the head 
divided vertically by a groove, gradually increasing in breadth, so as 
to give the clypeus a somewhat bilobed appearance. I have named 
