190 ALLOCHROMA. 



anterior angles are much depressed ; the sides marginate ; at the 

 base (when viewed obliquely) is a broad transverse depression ; the 

 surface is finely and thickly punctate throughout. Scutellum tri- 

 angular, impunctate. Elytra considerably broader than the thorax, 

 robust, punctate-striate (the striae becoming almost obsolete as they 

 approach the apex) ; an antemedial transverse depression gives a 

 prominence to the surface near the scutellum, extending obliquely 

 upwards, and terminating in a short and deep longitudinal fovea at 

 the apex of the shoulders, between the eighth and ninth stria? : the 

 surface (when viewed under a high power) is clothed throughout 

 sparingly with an obsolete flavous pubescence ; this pubescence is 

 more apparent near the apex. Antennae filiform, robust, tolerably 

 short, subincrassated, flavous, the joints seven to ten being fuscous. 

 Legs flavous throughout. 



Brazil. 



A. venustum may be recognized from most of its congeners by its 

 concolorous elytra ; it is distinctly broader than the two following 

 species, which also are concolorous. 



10. Allochroma nigro-marginatum. 



A. oblongo-ovale, robtistum, subpubeseens, Jlavo-ferrugineum ; ca- 

 pite brevi, ad basin carinato ; thorace transverso, angiitis anticis 

 subtruncatis, punctulato, ad basin pubescenti, ad marginationem 

 piceo ; elytris latis, punctato-striatis ; antennis dilatatis, art. 1-5 

 flavis, 6-9 rufo-piceis, 10 et 11 rufo-ferrugineis ; pedibus Jlavo- 

 ferrugineis. 



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



Oblong-oval, broad, robust, very finely pubescent, of a flavo- 

 ferrugineous colour throughout. Head short, depressed, slightly 

 elongated ; in front of the head is an obsolete transverse triangular 

 depression; above the insertion of the antenna? are two oblique 

 carinations extending transversely to the base of the head ; eyes 

 situated at the base of the head ; the surface is finely punctate. 

 Tlwrax transverse ; the anterior angles depressed and truncate ; the 

 sides marginate and rectilinear (very slightly subsinuate towards 

 the base) ; the surface is very finely punctate, clothed with pubes- 

 cence towards the sides and apex ; at the margination piceous. 

 Scutellum small, triangular, pubescent. Elytra broad, robust, finely 

 punctate-striate, transversely and antemedially subdepressed ; finely 

 flavo-pubescent. Antennae robust, slightly dilated towards the 

 middle; the joints one to five are flavous, six to nine rufo-piceous, 

 ten and eleven rufo-ferrugineous. Legs flavo-ferruginoous throughout. 



Rio Janeiro. In the collection of the Rev. H. Clark. 



