20 MONOPLATtTS. 



so than in M. semicJialybeus) ; the sides marginate, especially an- 

 teriorly; the surface impunctate and glabrous; at the base is a 

 transverse fovea (less deep and somewhat less distinct than in M. 

 semichalybeus), terminating, as in other species, by being deflected 

 into the basal line before it reaches the margin of the thorax. 

 Scutellum triangular and impunctate. Elytra subparallel, rounded 

 at the apex, impressed throughout with tolerably distinct punctures 

 arranged in the form of striae, of equal distinctness with those of 

 semichalybeus; it differs, however, ftvni this species in having the 

 surface entirely equate and smooth — not raised into longitudinal 

 keel-like ridges parallel with, and closely adjoining the lateral mar- 

 gination ; the colour is rufo-flavous, at the apex broadly fuscous, — 

 the line of boundary between the two colours being medial, and 

 slightly inclined towards the apex as it approaches the margination. 

 Antennae fuscous, the foiu' basal joints being ftavous. Legs flavous, 

 the posterior tibia? and tarsi as well as the termination of the femora 

 being suffused with piceous. 



Brazil. In the collection of M. Chevrolat. 



This species differs from all others allied to it in colour by the 

 depth of the punctuation of the elytra, and also generally by its un- 

 foveolated head ; from semichalybeus, to which it is closely allied, by 

 its punctuation, and the absence of any keel-like ridges at the sides 

 of the elytra. 



I believe that this group of six species (which have their elytra 

 rufo-flavous, the apex being broadly fuscous) are all specifically 

 distinct ; their differences rest on small, but well-defineable and 

 apparently permanent characters. 



1 7. Monoplatus angulatus. 



M. oblongo-ovatus, subparallelus, testaceo-rufus, glaber; capiie 

 brevi, inter oculos subtiliter foveolato ; thorace transverse-, ad basin 

 transverse foveolato, punctulato ; elytris pvmctato-striatis, ad 

 apicem fusco-nigris, ad basin testaceo-ritjrs ; antennis filiformibus, 

 fuscis, ad basin rufo-flavis ; pedibus rufo-jtavis. 



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



Oblong-ovate, subparallel, testaceo- rufous, glabrous. Head short, 

 hardly produced in front ; labrum subattenuated and rounded at the 

 apex ; eyes large, prominent, situated at the base of the head, and 

 extending laterally nearly as far as the anterior angles of the thorax ; 

 from the insertion of the antennae a faint medial longitudinal fovea 

 extends nearly to the base, which is bisected at right angles by a 

 transverse fovea connecting the inner margins of the eyes (these 



