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 

 coxae 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 Chl^enius. 

 Sp. 1. Chleenius violaceus. 



C. niger, supra violaceus ; capite inter oculos punctato ; thorace 

 punctato, postice paulo angustato, foveis duabus impresso ; 

 elytris profunde striatis, interstitiis subpunctulatis et paulo 

 convexis. 



Long. 7 j ; lat. 3^. 



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 striae are deeper, and the interstices are 

 more convex, than in Ch. velutinus : the puncturing in the inter- 

 spaces of the striae 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 antennae 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 foveae 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. Chlcenius (Platensis) Braziliensis ? Dejean. 



C. obscure niger, supra viridis ; antennis pedibusque testaceis ; 

 capite nitido ; thorace punctato, subnitido, postice attenuato, 

 foveis duabus impresso ; elytris striatis, interstitiis planis crebr& 

 et minutissime punctulatis. 



Statura paulo major quam Ch. nigricornis. 



Long. 5^ lin. ; lat. 2^. 



In size and colouring the Ch. Plaiensis resembles the Ch. nemo- 

 Ann. Mag. N. Hist. Vol vi. 2 a 



