164 



OCTOGONOTES. 



especially towards the sides and apex, with a very fine yellowish 

 pubescence (hardly discennble except under the microscope) ; at the 

 middle of each elytron (separated from the suture by two striae, 

 and from the lateral margination by a single stria) is a regularly 

 formed circular spot, clothed throughout with a close and distinct 

 straw-coloured pubescence ; this spot is connected with the shoulder 

 by an obsolete longitudinal cinereous marking, which occupies the 

 interval between the fifth and seventh striae. Antennce black ; the 

 first joint broad, dilated towards the extremity ; the second short, 

 and narrower ; the third and fourth much longer than the first (all of 

 these being indistinctly annulated with a fuscous band at their base) ; 

 the eighth to the tenth, and probably the eleventh, pale cinereous. 

 Legs flavous ; the upper part of the anterior femora, and also the 

 tibiae and tarsi, fuscous ; posterior claw entirely covered by a distinct 

 globular enlargement, which is of a bright orange colour. 



Cayenne. 



It may be a question, whether an examination of several speci- 

 mens would not resolve this into a simple variety of 0. Banoni, 

 Drap. The single specimen before me presents, however, apparently 

 distinct specific characters, not only in the markings of its elytra 

 (which consist of a single well-defined circular spot, instead of a 

 broad longitudinal line extending from the shoulder to the apex), 

 but also in the form of its thorax. In 0. Banoni the basal angles 

 of the thorax are broadly truncate, which, with the truncation of 

 the anterior angles, gives an appearance to the lateral margin of two 

 short, obtuse, lateral projections (the margin, between these two 

 projections being scooped out or emarginate), while in this species 

 (0. binotatus) the sides of the thorax are almost parallel. The black 

 markings also on the thorax of 0. binotatus are quite unrepresented 

 in that of 0. Banoni. 



5. Octogonotes sumptuosus. (Tab* VI. fig. 8.) 



0. oblongo-ovalis, robustus, niger, nitidus ; capite fovea triangulari 

 inter oculos, sparsim punctato ; thorace tramverso, angulato, ad 

 latera marginato, angulis anterioribus oblique truncatis,fidvo, au- 

 reo-pubescenti ; elytris, punctis veluti in striis ordinatis, nitidis, 

 nigris, fasciis duabus et maculis quatuor pubescentibus, auratis ; 

 fasciarum, hac ad medium, hoc pone medium, haud suturam 

 attingentibus ; macidarum, duabus ad humeros, tertia hngitudi- 

 nali ad suturam, juxta scutellum, quartaque ad apicem, com- 

 muni ; antennis pedibusque JJavis. 



Long. corp. 3| lin., lat. 13 lin. 



