Mr. Waterhouse on Carabideons Insects. 127 



foveisque duabus, impresso ; elytris piceo-nigris, distincte stria- 

 tis, striis impunctatis ; antennis, palpis, pedibusque piceo- 

 rubris ; abdomine ad apicem rufescente. 



Long. Corp. Z\ Im. ; lat. 1 \ lin. 



Hab. RIaldonado, Monte Video, S*^ Fe, etc. 



Tbis species may possibly be tbe F. oblita, or perhaps the F. Bo- 

 nariensis of Dejean ; but that author has not described those insects 

 with his usual care, and after much trouble I have been unable to 

 satisfy myself on this point. In all the specimens before me (eleven) 

 the elytra are more or less pitchy, the margin is distinctly pitchy 

 red beneath, and the terminal segment of the abdomen is of the 

 same colour, as well as the legs, palpi and antennae. In Dejean's 

 account of the two species above-mentioned, they are described as 

 black, with pitchy red legs. 



Fer. Patagonica is about the same size, or a trifle less than Argu- 

 tor vernalis, but the head and thorax are narrower, and the latter is 

 more contracted behind ; the elytra are rather more ovate, and the 

 frontal sulci are more distinct. 



Eyes moderately prominent, frontal sulci short and moderately 

 deep ; thorax about equal in length and breadth, rather narrower 

 behind than before ; the sides form a gentle and even curve from 

 the anterior, almost to the posterior angle, and the outer margin 

 meets the posterior margin so as to form nearly a right, or slightly 

 obtuse, angle ; the dorsal channel is distinct, and the posterior 

 fovese (one on each side) are in the form of narrow grooves ; there 

 are no punctures on the thorax : elytra considerably broader than 

 the thorax, and of an oblong-ovate form ; the striae moderately deep 

 and impunctate ; a short rudimentary stria is observable on each 

 side near the scutellum. 



In some of the specimens the body and thorax are red beneath, 

 but most commonly these parts are of a pitch colour ; the terminal 

 segment of the abdomen is always paler than the other parts. The 

 specimens, moreover, vary somewhat in the form of the thorax, the 

 posterior angles being sometimes almost acute, and in one or two 

 of the specimens there is a distinct transverse impression on the 

 hinder part of the thorax ; a specimen from Monte Video has no 

 wings. Notwithstanding these diflferences, I am convinced, after a 

 careful examination, that they are all the same species. 



Sp. 18. Feronia (Argutor^ Brullei. 



Fer. alata, piceo-nigra ; thorace subquadrato, postice striis punc- 

 tulisque impresso ; elytris subparallelis, profundepunctato-stria- 

 tis ; antennis palpisque testaceis ; pedibus piceo-rubris. 



Long. corp. 3^^ lin ; lat. 1 A lin. 



Hab. S'* Fe, Buenos Ayres. 



This species very neaiiy agrees in size with the Argutor vernalis, 

 but is of a narrower form, and the antennae are proportionately 

 longer, reaching, when extended backwards, considerably beyond 

 the base of the thorax. The general colour of the ujiper parts oi 

 the body is black, slightly inclining to pitchy ; the suture of the 



