128 Mr, Waterhouse on Carabideous Insects, 



elytra and outer margins are suffused with pitchy red ; the under 

 parts of the body are pitchy black ; the mandibles and legs pitchy 

 red, and the thighs assume a deeper hue in the middle ; the antennae 

 and palpi are testaceous. Eyes moderately prominent, frontal sulci 

 small and not deep ; thorax subquadrate, slightly attenuated be- 

 hind, the lateral and posterior margins forming a right angle on 

 each side at their junction ; dorsal channel moderately distinct, the 

 posterior fovea on each side in the form of a long narrow groove, 

 which extends to the posterior margin ; the space between these 

 fovese is punctured, but the punctures are not very numerous : elytra 

 considerably broader than the thorax, and with the lateral margins 

 nearly parallel, deeply punctate-striated — no abbreviated striae near 

 the scutellum. 



But one specimen of this insect was brought home by Mr. Darwin ; 

 it is easily distinguished from the preceding species by its distinctly 

 punctate striae. I have named it in honour of one of the authors of 

 the ' Histoire Naturelle des Insectes' now in course of publication. 



Sp. 19. Feronia (Argutor) Audouini. 



Fer. alata, nigra ; thorace subquadrato, angulis posticis subrotun- 

 datis, linea transversa striisque duabus impresso ; elytris paulo 

 elongatis, profunde striatis, striis impunctatis ; antennis pal- 

 pisque testaceis ; pedibus rufo -piceis. 



Long. Corp. 4 lin. ; lat. 1 J lin. 



Hab. S** F^, Buenos Ay res. 



This species is rather larger than Argutor vernalis ; the antennae 

 are proportionately longer and more slender ; the thorax is almost 

 precisely the same form, excepting that the posterior angles are 

 somewhat rounder ; the elytra are considerably longer. Eyes but 

 moderately prominent, and having two rounded and somewhat deep 

 foveae between them : thorax broader than long, the anterior and 

 posterior parts of equal width, and with the anterior and posterior 

 angles slightly rounded ; dorsal channel distinct, and extending from 

 the anterior to the posterior margins ; posterior foveae in the form 

 of long narrow grooves, which extend to the base of the thorax, 

 and are connected by a tolerably distinct transverse groove ; there 

 are no punctures on the thorax : elytra elongated, and rather deeply 

 striated ; the striae impunctate. 



Sp. 20. Feronia {Argutor) apicalis. 



Fer. alata, nigra ; thorace subquadrato postice angustiore, angu- 

 lis posticis obtusis, striisque duabus impresso ; elytris nigris vel 

 piceo-nigris ad apicem et marginem externum piceo-rubris ; 

 antennis palpisque testaceis ; pedibus rufo-piceis. 

 Long. Corp. 4^ — 4; lat. If— 1^ lin. 

 Hah. Maldonado, La Plata. 



Three specimens of this species, from the locality just mentioned, 



are contained in the collection ; they all have a distinct pitchy red 



patch at the tip of the elytra, a character which suggested the name. 



Head ovate, eyes but little prominent, two foveae in front joined 



by a transverse impression ; thorax nearly equal in length and 



