158 OCTOGONOTES. 



marginate and, medially, slightly dilated ; the posterior angles are 

 distinct and snbaente ; at the base a broad shallow transverse de- 

 pression extends obliquely towards the anterior angles, giving a 

 prominence and a rotundate appearance to the disc ; the surface is 

 punctate, in colour flavous, with the anterior margins and two medial 

 longitudinal indistinct markings rufo-fuscous. Scutelhim triangular, 

 distinct, flavous. Elytra punctate-striate (the striae being less distinct 

 towards the suture) ; an antemedial depression extends upivards along 

 the suture, and obliquely to the humeral angles, giving a rotundate and 

 subglobose form to the base of either elytron ; the surface is lsevigate, 

 and of a dark-fuscous coloiu*, gradually shading off towards the apex 

 into testaceous ; at the humeral angles (and extending partially along 

 the margination) is a light-flavous marking. Antenna? of the length 

 of the body, filiform ; the first joint incrassated towards the apex and 

 inflected outwards ; the second short, ovate ; the third longer than the 

 fh'st, fine, and slightly incrassated at the apex ; fourth and fifth nearly 

 equal ; seventh to eleventh with a distinct tendency to dilatation ; in 

 colour, first to sixth flavous, seventh and eighth dark fuscous, ninth 

 to eleventh pale testaceous. Legs pale testaceous, infuscated at the 

 base of the posterior femora (suggesting, from their general appear- 

 ance, the immaturity of the example) ; the globular inflation of the 

 posterior claw bright red. 



A single specimen was captured by Mr. Gray at Petropolis (Organ 

 Mountains), February 1857. 



Genus 26. 0CT0G0N0TES*. 



Drop. Ann. des Sc. Phys. vol. iii. p. 181. 



Ihj. Cat. ed. 3 (1837), p. 407. 



Laporte, Hist. Nat. des Anim. Artie. Coleopt. (1840) vol. ii. p. 519. 



Hope, Coleopt. Manual, vol. iii. (1840) p. 169. 



Orbiyny, Dictionnaire dHistoire Naturelle (1841, &c). 



Labrxtm latum, ad latera rotundatum. 



Mandibul^; robustee, ad apicem aeuminato?, ad basin dentieidatai. 



Palpi maxillares inflati, art. 2 1 "'" sensim incrassato, 3' 10 abbreviato, 

 valde dilatato, ultimo subidato, depresso. 



Palpi labiales elongati, subeylindrki, ad apicem attenimti. 



Antenjle^Zj 'formes, robustee, in 3 suhattenuatce et prodtictce. 



Oculi distantes, in $ globosi. 



Caput haud } productum, breve, depressum. 



Thorax transversiis, ad latent angulatus, plerumque complanatus. 



* Otero), octo ; yuvia, angulus. 



