MONOPLATUS. 21 



two lines together forming the character of a cross) ; the surface im- 

 punctate, glabrous. Thorax transverse, the anterior angles subacute 

 and depressed, the sides broadly and distinctly marginate ; at the 

 base is a well-defined transverse groove parallel to the line of the 

 base, but subsinuate, and terminating abruptly before it reaches the 

 lateral margination by being deflected at right angles into the line 

 of the base ; the surface very finely punctate, glabrous. Scutellum 

 triangular, impunctate. Elytra slightly broader than the thorax, 

 subrobust, punctate-striate, the striae becoming obsolete near the 

 sides, and the punctures being distinct and well-defined ; the apical 

 half of the surface is of a bright fuscous -black colour. Antennae fili- 

 form, fuscous, the three basal joints being rafo-flavous. Legs rufo- 

 flavous throughout. 



Brazil. In the collection of M. Chevrolat. 



This species closely approaches semichalybeus, being however abun- 

 dantly distinct, not only by its smaller size and more pronounced 

 punctures on the elytra, but also by the sinuation in the basal fovea 

 of the thorax, by which latter character it separates itself from all 

 other species of the group with which I am acquainted. 



18. Monoplatus impunctatus. 



M. oblongo-ovatus, parallelus, striato-punctulatus, niger, nitidus ; 

 capite brevi, inter oculos transverse foveolato, impunctato, flavo ; 

 thorace transverse, rectangulari, ad basin transverse foveolqto, ad 

 latera marginato, impunctato, flavo ; elytris parallelis, striato- 



punctatis, ante medium oblique depressis, nigris, nitidis; antennis 



fuscis, art. ].3jlavis; pedibus flavis. 



3 Long. corp. 21 lin., lat. | 1 lin. 



Oblong-ovate, subrobust, parallel, punctate, black, shining. Head 

 short, transverse, slightly produced ; above the labrum is a transverse 

 depression, bisected medially by a longitudinal carination ; on either 

 side of the insertion of the antennae (adjoining the inner surface of 

 the eyes) is a minute depression j between the eyes (midway between 

 the basal line and the insertion of the antennae) is a transverse thread- 

 like and very minute fovea ; eyes large, globose, extending laterally 

 as far as the anterior angles of the thorax ; surface impunctate and 

 rufous. Thorax transverse, in front hardly emarginate ; the anterior 

 angles are depressed and subacute, the sides marginate ; at the base a 

 transverse fovea (distinct, narrow, and thread-like) extends parallel 

 to, and joins the line of the base by an abrupt deflection near the 

 posterior angles ; surface impunctate and flavous. Scutellum trian- 

 gular, impunctate, fulvo-flavous. Elytra broader than the thorax, 



