MONOPLATUS. 



punctate, rafo -ferruginous, and glabrous. Scutellwn triangular, im- 

 punctate, black. Elytra broader than the thorax, subcylindrical, 

 and subattenuated towards the apex ; an antemedial transverse ob- 

 solete depression gives prominence to the surface near the scutellary 

 angles ; punctate- striate, black, shining. Antennce filiform, fuscous. 

 Legs black, the anterior femora being at their base suffused with 

 rufous. 



Examples of the females of the species were taken by my friend 

 Mr. Gray and myself at Petropolis (Organ Mountains, Province of 

 Rio Janeiro), February 1859. A slight tendency to variation may 

 be traced among them in the colour of the thorax. 



2. Monoplatus Presidencies. 



M. ( $) oblongo-ovalis, subcylindricus, glaber, niger ; capite brevi, 

 impunctato, rufo, inter oculos (magnos, nigros) transverse sub- 

 tiliter foveolato ; thorace transverso, antice emarginato, ad latera 

 rnarginato, ad basin transverse canalkulato, impunctato, rufo; 

 elytris robustis, punctato-st riatis, ad apicem subattmuatis, nigris, 

 nitidis ; antennis filiformibus, fuscis ; pedibus rufis, tarsis tibiis- 

 que anterioribus fusco-nigris. 



2 Long. corp. 3| lin., lat. 1| lin. 



Oblong-ovate, robust, subcylindrical, impubescent, black, gla- 

 brous. Head short, transverse, not produced in front ; the eyes are 

 large, occupying a considerable portion of the head, prominent, and 

 black; between the eyes is a minute transverse fovea; the surface 

 is impunctate, glabrous, rufous. Thorax broader than the head, trans- 

 verse, rectangular; the anterior margin is medially emarginate (but 

 not so deeply as in M. nigripes) ; the anterior angles are subacute, 

 slightly prominent and depressed ; the sides marginate : at the base 

 is a transverse fovea (which runs parallel to the line of the base), 

 but which is deflected (before it reaches the lateral margins) at right 

 angles to the basal line ; this fovea is not, as in nigripes, subsinuate, 

 but accurately parallel to the fine of the base : the surface is im- 

 punctate, shining, rufous. Scutellum triangular (somewhat longer 

 and more distinct than in nigripes), glabrous, black. Elytra broader 

 than the thorax, robust, subcylindrical, slightly attenuate at the 

 apex, punctate-striate ; near the scute llary angles the surface is 

 somewhat gibbous (the striae and punctures being more obsolete) ; at 

 the fifth and sixth striae near the shoulders is a slight longitudinal 

 depression. Antenna; filiform, fuscous, the three basal joints being 

 rufous. Legs rufous, the anterior tibiae and tarsi being fuscous. 



The only example of this species (a female) was taken at Presi- 



