10 MONOPLATUS. 



may be readily separated by its rufous colour and completely dif- 

 ferent arrangement of the transverse bands. Both the examples 

 which have come before me of this species are females. 



6. Monoplatus apicatus. 



M. oblongo-ovalis, parallelus, subdepressus,testaceo-rufus, nitidus ; 

 capite parvo, ocidis exstantibus, magnis ; thorace transverso, 

 rectangidari, marginato, ad basin transverse foveolato ; elytris 

 parallelis,punctato-striatis,ad basin nigris; antennis filiformibus, 

 fuscis, ad basin flavis ; pedibus jlavis, fusco adumbratis. 



J Long. corp. 2| lin., lat. 1^- lin. 

 2 Long. corp. 3% lin., lat. If lin. 



Oblong- ovate, depressed, parallel, rufo-testaceous, shining. Head 

 transverse, not produced ; eyes very large, prominent, but not extending 

 laterally as far as the anterior angles of the thorax ; between the eyes 

 and above the insertion of the antennas is a small, obsolete, longitudinal 

 depression ; surface impunctate, black, shining ; two circular dark-fus- 

 cous ocelli-like markings are faintly apparent at the posterior and inner 

 margin of the eyes. Thorax transverse, rectangular ; the anterior 

 angles depressed, but slightly prominent ; the sides marginate ; pos- 

 terior angles distinct ; parallel to the base is a transverse narrow 

 fovea which terminates abruptly before it reaches the margination ; 

 surface impunctate, rufo-testaceous, slightly suffused (in the exam- 

 ples before me) with fuscous ; shining. Scutellum distinct, trian- 

 gular, impunctate, fuscous. Elytra subcylindrical, slightly depressed, 

 rounded at the apex, punctate-striate, with the humeral and scutellar 

 angles broadly gibbous; rufo-testaceous (slightly paler than the 

 thorax), with the apex black (this colouring at the apex occupies 

 about one-fifth of the whole surface of the elytra, and is defined by 

 a regular transverse margin, the line of which inclines in the direc- 

 tion of the base, as it approaches the margination). Antennas filiform, 

 of the length of the elytra ; the first joint long, and incrassated at the 

 apex ; the second short, ovate ; the third and fourth nearly equal ; 

 the first to fourth (with the exception of the upper part of the first 

 and second) testaceous, the rest fuscous. Legs rufo-testaceous through- 

 out, the femora being more or less suffused with fuscous. 



The above description is taken from a male. The females are more 

 robust, less parallel ; the legs, especially the posterior pair, somewhat 

 shorter in proportion to the body; the head larger, but the eyes 

 smaller and less prominent, and the antennae shorter. 



Specimens of both sexes were captured by Mr. Gray and myself in 

 the immediate neighbourhood of Petropolis (Organ Mountains, Eio 

 Janeiro), February 1857. 



