260 EE VISION OF THE GENUS X0T0X03[rS, 



II. Form wide; prothorax transverse, wider across base than 

 apex; elytra with eighth interstice a little wider than 

 ninth, not unusually narrowed posteriorly, tenth inter- 

 stice short, feebly developed N. violaceomarginatus. 



MM. Pronotum opaque, closely transversely striolate. 

 m. Elytra with all discoidal interstices equally smooth. 

 cr. Prothorax with sides sinuate before the base. 



r. Elytra with eighth interstice wide N. riigosicollis. 



TT. Elytra with eighth interstice narrow... A'', depressipennis. 

 era: Prothorax with sides not sinuate posteriorly (elytra with 



eighth interstice narrow, convex) N. discoriinosus. 



vim. Elytra with alternate interstices of disc foveolate 



N. opacicollis. 



hli. Elytra with third interstice normally bearing more than two 



punctures, the posterior puncture normally on apical declivity. 



n. Prothorax with posterior marginal puncture at basal angle on 



lateral border (border usually dilated to receive puncture). 



N. Elytra with basal border joining lateral border at humeral 



angle without any interruption. Elytral striae crenulate 



N. amahilis, 



NN. Elytra with point of junction between basal and lateral borders 

 at humeral angle interrupted (the basal border more or less 

 raised), 

 o. Size rather small ; prothorax with lateral border narrow ; 

 elytra with border narrowed to base. 

 V. Head and prothorax black. 



0. Form not elongate, third interstice of elytra normally 

 with more than two punctures and not swollen 

 posteriorly. 



X- Elytra viridescent, lightly convex N. sphodroides. 



XX' Elytra purple, depressed N. dyscoloides. 



^<^. Form elongate; third interstice of elytra bipunctate 

 and swollen at posterior puncture... A", victoriensis. 



vv. Head and prothorax seneous. (Form elongate) 



iV. opnlentus. 



00. Size large ; prothorax with lateral border wide and erect 

 posteriorly; elytra with lateral border widely carinate at 

 base, 

 •v//-- Prothorax with sides sinuate before base, basal angles 



sharply marked N. (Oteomicans. 



yj^^' Prothorax with sides not sinuate posteriorly, basal 

 angles obtuse N. colossus. 



