126 Mr. Waterhouse on Carabid^ous Insects. 



rower, head and thorax decidedly narrower, the latter with the pos- 

 terior fovese more marked, and the elytra rather more distinctly 

 striated. 



Head narrow, eyes moderately prominent, frontal sulci not deep ; 

 thorax subquadrate, the sides slightly rounded ; dorsal channel di- 

 stinct ; posterior fovese in the form of narrow grooves, and rather 

 deep ; the space between these foveae is punctured, but the punctures 

 are not very numerous, and the space between the fovese and the 

 outer angles of the thorax is impunctate : elytra oblong-ovate, di- 

 stinctly striated ; the striae punctate, but the punctures are not very 

 distinct : antennae with the three basal joints blackish in the middle, 

 but with the extremities red ; the remaining joints brown : palpi 

 pitchy red : legs pitchy black ; the tarsi pitchy red. The upper 

 parts of this insect are black, but I fancy I can trace some slight 

 shades of blue, and think it probable it is a dark variety of a species 

 having metallic colouring like the F. unistriatus. 



I have named this species after M. Guerin-M6neville, whose 

 works have done much towards the elucidation of the various 

 branches of Natural History, and more especially the entomological 

 department. 



Sp. 16. Feronia (Pcecillus) depressa. 



Fer. subdepressa, nigra, suprk cupreavel aeneo-cuprea; thorace sub- 

 quadrato, postic^ utrinque striato ; elytris elongatis, subparal- 

 lelis, distincte striatis ; antennis palpisque fuscis, his atque illis 

 ad basin rufescentibus ; pedibus nigris, tibiis piceo-rubris. 



Long. Corp. 5^ — 5f ; lat. Ij — 2 lin. 



Hab, Monte Video. 



This species is a trifle less than Pmcillus lepidus, and of a more 

 depressed form, and the striae on the elytra are not quite so deep. 



Head rather large and obtuse in front ; eyes very prominent, the 

 frontal sulci very deep ; thorax but slightly convex, nearly square, 

 the sides but slightly rounded, and the fore part somewhat con- 

 tracted ; both anterior and posterior angles rather obtuse ; dorsal 

 channel tolerably distinct ; posterior foveae in the form of narrow 

 and tolerably long impunctate grooves, and situated about midway 

 between the dorsal channel and the outer margin of the thorax : 

 elytra somewhat depressed, and having the sides nearly parallel ; 

 distinctly striated thoughout, the striae impunctate ; an impressed 

 point on the second stria from the suture towards the base of the 

 elytra, and two similar impressions on the stria situated on the 

 hinder half of the elytra : antennae shorter than the head and thorax, 

 and rather thick ; the three basal joints testaceous, and the remain- 

 der brown : palpi testaceous, the apical joints somewhat pitchy : 

 legs black ; anterior tibiae pitchy red ; tarsi and posterior tibiae pitchy. 



The above description is drawn up from three specimens from 

 Monte Video. 



The following species belong to the sub-genus Argutor : — 



Sp. 17. Feronia {Argutor) Patagonica. 



Fer. alata, nigra ; thorace subquadrato, sulco dorsali mediocri. 



