MONOPLATFS. 13 



to which alone it approaches in colouring, by the striation on the 

 elytra (which is entirely obsolete in jucundus) and by the puncturing 

 of the striae, which is distinct, broad, and deep. 



Taken by Mr. Gray and myself, abundantly, in the neighbourhood 

 of Petropolis (Organ Mountains, Rio Janeiro), February 1857. A 

 single specimen has also been found by Mr. Squire in the neigh- 

 bourhood of Rio Janeiro. 



9. Monoplatus jucundns. 



M. oblongo-ovatus, latus, subdepressus, impubescens, rufus ; capite 

 brevi, inter oculos longitudinaliter depresso, impunctato ; thorace 

 transverse, ad basin foveolato, impunctato ; elytris latis, leviter 

 striato-punctatis ; antennis filiformibus, fuscis, ad basin ferru- 

 gineis ; pedibus ferrugineis, tibiis tarsisque anterioribus, tarsisque 

 posticis nigris. 



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



Oblong-ovate, broad, depressed, impubescent, of a bright rufous 

 colour throughout. Head short, depressed, not produced in front ; 

 eyes large, situated at the base of the head, not extending laterally 

 as far as the anterior angle of the thorax ; between the eyes and 

 above the insertion of the antennae is a distinct longitudinal de- 

 pression ; the surface impunctate. Thorax transverse, rectangular, 

 in front obsoletely emarginate ; the anterior angles very much de- 

 pressed, subacute, produced laterally beyond the line of margination ; 

 the sides marginate, especially towards the apical angles, subsinuate ; 

 at the base a narrow transverse fovea extends parallel to the margin 

 and terminates on either side in an abrupt inflection towards the 

 base ; the surface impunctate. Scutellum large, triangular, impunc- 

 tate. Elytra broad (much broader than the thorax), robust, and 

 depressed, with rows of very fine punctures arranged as striae ; the 

 surface near the scutellary angles is somewhat raised, and the striae- 

 like punctures become almost obsolete ; the sides distinctly margi- 

 nate. Antennae shorter than the elytra, filiform ; the joints arranged 

 as in the allied species, the first to the third ferruginous, the rest 

 fuscous. Legs ferruginous, with the anterior tibiae, tarsi, and the 

 posterior tarsi black. 



Captured by Mr. Miers in the neighbourhood of Rio Janeiro. In 

 the collection of Mr. Miers and also of the Rev. H. Clark. 



M. jucundus not only differs in its colour (being much more 

 brightly and uniformly rufous) from croceus, but also in the punc- 

 tuation of its elytra ; there is, in this species, a total absence of any 

 appearance of striae, and the punctures themselves are very much 

 more minute. 



