56 TETKAGONOTES. 



genus, Rhinotmetus) ; above the labrum is a transverse carination, in- 

 tercepted by a longitudinal medial ridge, which extends upwards to 

 the base of the antennae ; above the base of the antennae this ridge 

 is divided into two slightly diverging (almost parallel) carinations, 

 which recede from one another gradually, so as to terminate trans- 

 versely at the upper and inner margins of the eyes ; eyes tolerably 

 large, globose, situated at some little distance from the base of the 

 head ; the surface is deeply punctate, and black ; immediately above 

 the base of the antennae, and also at the upper and inner margins of 

 the eyes, are two minute flavo-suifused spots. Thorax elongate, sub- 

 cylindrical, slightly broader than the head ; the anterior angles de- 

 pressed and subprominently acute ; the sides finely marginate, with 

 a lateral angular projection, antemedial and prominent: at the 

 centre of the disc are two large, well-defined tubercular elevations ; 

 these are antemedial, not extending however to the anterior mar- 

 gin, which is not elevated at all above the plane of the thorax : the 

 surface is sparingly but deeply punctate throughout, of a rufo-fer- 

 rugineous colour. Scutellum small, triangular, impunctate, fuscous. 

 Elytra broader than the thorax, subelongate, subcylindrical, punctate- 

 striate (the punctures being deep, and the striae almost obsolete), both 

 striae and punctures becoming obsolete near the apex ; impubescent, 

 black. Antennce robust, flavo-fuscous, the four basal joints being suf- 

 fused with rufous. Leys black, the base of the femora being flavous, 

 the terminal joint of the tarsi suffused with rufous, and the posterior 

 tibiae pale testaceous. 



A beautiful variety is found, somewhat smaller in size, identical in 

 form and sculpture, with the head and thorax of a pale rufous colour. 

 Constancia (Organ Mountains) ; taken by Mr. Gray and myself in 

 January 1857. 



2. Tetragonotes atra. 



T. oblongo-ovata, subparallela, subelongata, impubescens, punctato- 

 striata, atra ; capite antice producto, carinato, supra basin anten- 

 narum oblique carinato, punctato, nigro ; thorace elongato, late- 

 ribus marginatis, ante medium angulatis, Tiaud ad medium di- 

 stincte elevato, impunctato; elytris subelongatis, punctato-striatis ; 

 antennis robustis, Jiliformibus, rufo-piceis ; pedibus piceis, femo- 

 ribus ad basin flams, tibiisque posticis testaceis. 



Long. corp. 2| lin., lat. 1 lin. 



Oblong-ovate, subparallel, subelongate, impubescent, punctate - 

 striate, black. Head short (produced in front) ; from the labrum to 

 the base of the antennae is a medial longitudinal carination, which 

 extending above the base slightly diverges, until it reaches the inner 



