TETRAGONOTES. 53 



Oblong-ovate, subparallel, attenuated in front, punctate-striate, 

 impubescent, black. Head produced in front ; from the apex to the 

 base of the antennae is an obsolete longitudinal ridge, while imme- 

 diately above their insertion are (when viewed obliquely) two lon- 

 gitudinal tubercular elevations ; eyes large, situated at the base of 

 the head ; the surface granulated and black. Thorax quadrate 

 (subelongate), anteriorly rounded (more abruptly and less broadly 

 than in preceding species, thus forming an obscure angle, and showing 

 a tendency to assume the form represented in the following genus, 

 Tetragonotes) ; the anterior angles much depressed, the sides broadly 

 marginate, and the base transversely depressed ; this depression is di- 

 stinct, and not obsolete as in other species : surface im])\inct&te, finely 

 flavo-pubescent, rufous. Scutellum triangular, impunetate, black. 

 Elytra broader than the thorax, parallel, punctate-striate, finely sub- 

 pubescent, of a deep dead-black colour. Abdomen black. Antenna; 

 robust, filiform, black, the basal joints being suffused with fuscous. 

 Legs black, the posterior tibiae and tarsi suffused with ferrugineous. 



This species is an interesting connecting link between Rhinotmetus 

 and the following genus, Tetragonotes. In facies it is abundantly a 

 Rhinotmetus, but in the form of the thorax it approaches very near 

 to the following genus. 



I captured a single example of this species at Petropolis (Organ 

 Mountains), February 1857. 



Genus 6. TETRAGONOTES*. 



Corpus elongatum, depressum, subparallelum. 

 Labrum constriction, transversum. 

 Palpi maxillares elongati, art. 3° ovato. 

 Palpi labiales subovati. 

 Antennae filiformes, sat robustce. 

 Caput breve, antice (in J proisertim) productum. 

 Thorax elongatus, rectangularis, haud antice rotundatus, ad latcra 

 tnarginatus et angidatus. 



Elytra subparallela, depressa, apicem versus subattenuata. 



Pedes : femora postica incrassata ; post, tibia? breves, subincurvake, 

 juxta apicem haud dentatce, ut in genere Pliinotmeto, sed sinuatce. 



Labrum transversely subcircular, narrower than the head. 

 Mandibles robust, with a slight tooth-like prominence at then- 

 inner surface, concealed. 



Maxillary palpi (Tab. II. fig. 3 m) elongate, the second joint being 

 * reroa ( = reff<rapes), quatuor ; yiovia, angulus. 



