Mr. Waterhouse on Carabideous Insects. 353 
basal joint black, tinted with red at the base, the second, third, and 
fourth joints black, and the following joints pitchy; legs black, the 
coxe red, and the tarsi pitchy ; chest reddish in the middle, the rest 
of the body beneath, as well as the elytra, black; the ridges on the 
elytra are well marked, and their interstices are impunctate. 
The collection contains four specimens of this species. 
Genus CHLANIUS. 
Sp. 1. Chlenius violaceus. 
C. niger, supra violaceus ; capite inter oculos punctato; thorace 
punctato, posticé pauld angustato, foveis duabus impresso ; 
elytris profundé striatis, interstitlis subpunctulatis et pauld 
convexis. 
Long. 73; lat. 34. 
This species is very nearly equal in size to the Ch. velutinus of 
Europe, which it also somewhat resembles in form. ‘The eyes are 
a trifle more prominent; in the form of the thorax as well as in the 
sculpturing these two insects very nearly agree, but the dorsal 
channel is rather more distinct in Ch. violaceus. The elytra in the 
present species are smaller in proportion to the head and thorax, 
rather more convex, the striz are deeper, and the interstices are 
more convex, than in Ch. velutinus: the puncturing in the inter- 
spaces of the striz is moreover rather more distinct, and the punc- 
tures are far less numerous. 
In one of the two specimens brought by Mr. Darwin the upper 
surface of the body is of a beautiful steel blue, and the thorax is 
violet ; in the second specimen the whole of the upper parts is violet : 
the under parts of the body and the lip and antenne are black, but 
the latter are tinted with pitch colour at the apex; the palpi are 
pitchy black. On the fore part of the head are a few scattered 
punctures, and on the hinder part one of the specimens is rather 
thickly and coarsely punctured ; the other specimen has much fewer 
punctures on this part. ‘The thorax is rather narrower than the 
head, and nearly equal in length and width; it is subquadrate, but 
slightly dilated near the front; its upper surface is coarsely punc- 
tured, on the disc these punctures are not very abundant: the dorsal 
channel is well marked and rather broad; the posterior fovez are 
moderately deep. ‘The elytra are subovate, less straight at the sides 
than in Ch. velutinus, rather deeply striated ; the interstices are very 
convex, and distinctly, but rather sparingly, punctured. 
Sp. 2. Chlenius (Plaiensis) Braziliensis ? Dejean. 
C. obscuré niger, supra viridis; antennis pedibusque testaceis ; 
capite nitido ; thorace punctato, subnitido, posticé attenuato, 
foveis duabus impresso ; elytris striatis, interstitiis planis crebré 
et minutissimé punctulatis. 
Statura pauld major quam Ch. nigricornis. 
Long. 54 lin. ; lat. 23. 
In size and colouring the Ch. Platensis resembles the Ch. nemo- 
Ann. & Mag. N. Hist. Vol. vi. 2A 
