122 Mr. Waterhouse on Carabideous Insects. 



is an impression on the third stria situated on the anterior half of 

 the elytra. This insect is of a glossy black colour throughout — on 

 the upper parts there is a very indistinct metallic gloss. 

 Mr. Darwin found but one specimen of this insect. 



Sp. 5. Feronia suhmetallica. 



Fer. alata, nigra, supra nigro-senea; thorace sub-cordato, posticfe 

 foveis duabus punctulisque impresso ; elytris paulo elongatis, 

 subparallelis, distinct^ striatis, interspatiis leviter convexis. 



Long. Corp. 6^ lin. ; lat. 2^ lin. 



Hah. Maldonado, La Plata. 



This species is about equal in size to the F. cordicollis of the same 

 country, and rather larger than the F. macer of Europe. In many 

 respects it is intermediate between the F. Corinthia (or striata) and 

 the F. cordicollis ; the head is proportionately rather larger than in 

 the latter, but considerably less than in the former species ; in the 

 sculpturing of the elytra it greatly resembles the F. Dejeanii, and 

 differs from F. cordicollis in having the strise impunctate, and from 

 F. Corinthia in having these striae distinctly continued throughout 

 the surface of the elytra. The thorax is less attenuated behind than 

 in either of these species, being veri/ nearly of equal width in front 

 and behind. 



Description. — Head triangular in front of the eyes (which are 

 tolerably prominent), suddenly contracted, and cylindrical behind 

 the eyes, with two longitudinal irregular impressions in front: 

 thorax rounded at the sides, and but slightly attenuated and trun- 

 cated behind, the dorsal channel distinct ; the anterior and posterior 

 transverse impressions indistinct, and the posterior fovese in the 

 form of longitudinal grooves*, rather short and deep and minutely 

 punctured. Elytra moderately long, and but slightly broader in the 

 middle than near the extremities ; the striae moderately deep and 

 impunctate, and the interspaces are slightly convex ; two abbreviated 

 striae near the scutellum ; on the second stria from the suture are 

 two impressed points, situated on the hinder half of each elytron, 

 and onthe third are one or two similar impressions. The general 

 colour of the upper surface of the body is brassy black ; the under 

 parts of the body, as well as the legs, antennae and palpi, are black. 



But two specimens of this species were brought home by Mr. 

 Darwin ; one is from Maldonado, La Plata, and the other from 

 Monte Video. 



Sp. 6. Feronia assimilis, Dejean, Sp. gen. des Coleop., Suppl., 

 tom. V. p. 773. 



A Feronia, agreeing well with Dejean's description of the above- 

 mentioned species, was found by Mr. Darwin at Monte Video. It 

 is about the same size as the Feronia macer, and, like F. cordicollis, 



* None of the South American Feronies which I have seen, have more 

 than one fovea on each side at the base of the thorax, and in this respect 

 they differ from those European forms (such as F. melanaria) in which 

 there are two channels on each side. 



