BY THOMAS G. SLOANE. 261 



nil. Prothorax with posterior marginal puncture not on basal 



border. 



p. Prothorax cordate; head large; elytra with eighth interstice 



narrower than ninth (size small, colour black )...xV. rufipalpis. 



pp. Prothorax hardly narrowed to base; head small; eighth elytral 



interstice wider than ninth (size large). 



0). Form depressed; elytra with humeral angles strongly dentate 



(colour Eeneous) K. cques. 



(0(o. Form convex; elytra with basal border only a little raised 

 at humeral angle. (Elytra dark, with green margin) 



N. spenceri. 



bb. Elytra with striae 1-4 deeply impressed, 5-7 obsolete... iV. mediosnlaitm. 

 bbb. Elytra with striae obliterated, or faint. 

 p. Elytra with humeral angles dentate. 



q. Size large; prothorax transverse, lightly and obliquely rounded to 



base; black N. moUi^tus. 



qq. Size moderate; prothorax strongly angustate to base, with sides 



lightly sinuate; elytra virescent iV. Ixershawi. 



pp. Elytra with humeral angles not dentate. 



r. Prothorax widest before middle, a little narrowed to base; elytra 

 with basal border a little raised at point of junction with lateral 



border; elytra chalybeous X. chalijbeus. 



rr. Form convex; prothorax widest about middle, sides strongly and 

 evenly rounded ; elytra with basal border joining lateral at 



humeral angles without interruption ; colour black N. gravis. 



aa. Metasternum with episterna elongate. 



Q. Elytra with humeral angles dentate iV". miles. 



QQ. Elytra with basal border joining lateral border at humeral angles 

 without interruption ., N. lemeuri. 



iSToTONOMUS FRENCHI, ll.sp. 



9. Depressed, oval. Head very large; mandibles long, decus- 

 sating; labrum emarginate: prothorax subcordate; sides strongly 

 sinuate and straight before base; basal angles obtuse, widely 

 bordered at summit ; posterior marginal puncture in lateral 

 channel distant from base : elytra lightly striate, sixth and seventh 

 stride fainter ; interstices depressed, third 4-punctate, tenth 

 moderately developed; humeral angles rounded. Head and pro- 

 thorax of a gilt brassy colour, prothorax with cupreous reflections 



