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-vufus, niildus ; 

 capite parvo, ocidis eccstantibus, magnis ; thorace transverso, 

 rectangidari, marginato, ad basin transverse foveolato ; elytris 

 parallelis,punctato-striatis,ad has!,/ nigris; ami. nnisfiliformibus, 

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



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



$ Long. corp. 3^ lin., lat. 1| 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 antenna) 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. ScuteUum 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 antenna; shorter. 



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

 the immediate neighbourhood of Petropolis (Organ Mountains, Rio 

 Janeiro), February 1857. 



