MONOPLAXUS. 19 



Il( ad short, transverse, not produced in front ; eyes globose, situated 

 nearly at the base of the head ; between the eyes, above the base of 

 the antennae, the surface is impunctate, and unmarked by any trans- 

 verse fovea. Thorax transverse, rectangular, the anterior margin 

 distinctly emarginate (more apparently so than in the allied species 

 M. nigricans and M. semiviolaceus) ; the sides marginate, especially 

 near the anterior angles ; at the base is a transverse fovea, well de- 

 fined, abruptly terminating before it reaches the margin by being 

 deflected (at right angles) to the basal line ; the surface is impunc- 

 tate throughout and rufo-flavous. Scutellum triangular, impunctate. 

 Elytra broader than the thorax, subparallel, subdeprcssed, marked 

 throughout with very minute strioe-like punctures (which are not 

 discernible except under a high power) ; the colour is rufo-flavous, at 

 the apex broadly fuscous, — the line of demarcation between the two 

 being medial, and slightly inclining towards the apex at the suture 

 and at the margination ; the line itself is not so distinctly defined as 

 in M. semiviolaceus. Antennae fuscous, the basal joints being rufous. 

 Legs rufous, the anterior tarsi being suffused with fuscous. 



Brazil. In the collection of M. C'hevrolat. 



This species most closely approaches to M. semiviolaceus, both in 

 general colouring and in the details of sculpture. The absence of any 

 transverse fovea on the head sufficiently characterizes it as a species, 

 inasmuch as this — the character of the transverse markings between 

 the eyes — seems to be constant throughout the group, and of con- 

 siderable importance in the determination of species. From M. 

 semichalybeus it is easily separated by the minuteness of the punctua- 

 tion on its elytra, and by the direction of the transverse line of sepa- 

 ration between the two colours on the elytra. 



16. Monoplatus dimidiatipennis. 



M. oblongo-ovatus, subparallel us, subdepressm, rufo-Jlavus, glaber; 

 capite brevi, antiee hand producto, inter oculos haud foveolato; 

 ihorace transverso, impunctato, ad basin transverse foveolato ; 

 elytris parallelis, striato-punctatis, haud ad latera carinatis, gla- 

 bratis, ad apiceni nigro-fuscis ; antennis fuscis, ad basin jlavis ; 

 pedibus flavis, posticis tibiis tarsisque piceo suffusis. 



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



Oblong-ovate, subparallel, subdepressed, rufo-flavous, glabrous. 

 Head short, transverse, not produced in front ; eyes large, globular, 

 situated at the base of the head ; the surface above the base of the 

 antennae is impunctate, and unmarked by fovea?. Thorax transverse, 

 rectangular; the anterior margin is slightly emarginate (less distinctly 



c2 



