220 HYMENOPTEEA OF AMERICA. [PART I. 



9 . Clypeo subconvexo, nigro, apice recte-bicarinato, submarginato. 



% . Clypeo luteo, argentato, bidentato, lineola post-oculari albida ; anten- 



narum nncino et articulo praecedenti, ferrugineis. 

 Variat. Thoracis et abdominis lituria rudiinentariis, incompletis, paene 



nullis, vel pronoto Digro. 



Odynerus arcuatus Sauss. Vespides, I, 160, 45 (1852) ; III, 326. 



This species can be regarded as the Chilian type of the genus 

 Nortonia, and places itself in this genus, since all its characters 

 attach it to the Odynerus of this division, but with a particular 

 prolongation of the first abdominal segment. 



It is must closely allied to 0. vestitus and excipiendus (Comp. 

 these species). 



Eab. Chili. 



45). O. excipiosulus Spin. — Niger, velutinus, 0. arcuato simillimus, 

 sed metanoto postice inagis punctata ; abdominis primo segmento superne 

 minus tumido; secundo segmento medio in tuberculum produuto ; seg- 

 ments 1°, 20 luteo- marginatis, vel fere omnino nigris; antennis nigris ; 

 pedibus runs, basi nigris ; alis ferrugineis, apice fusco-cyaneis. — Longit. 

 14 mm. 



9 . Clypeo nigro, planato, apice bidentato et carinulis 2 sinuatis instructo. 



%. Clypeo emargiuato, luteo, nigro-piloso, utrinque nigro-marginato ; 

 antennarum uncino nigro. 



Eumenes excipienda Spin, in Cay's Hist, fisic de Chile, Zool. VI, 2S6, 



1 (1851). 

 Odynerus excipiendus Sauss. Vespides, I, 161, 47; III, 227. 

 Odynerus colocolo Sauss. ibid. I, 161, 46 (1852) ; III, 227.— Gay's Hist. 



lis. de Chile, Zool. VI, Suppl. 566, 8 (1852). 



In this species, the clypeus 9 is black, flattened, with two 

 sinuated carinae, terminating in two apical teeth; the clypeus % 

 is luteous, bordered with Mack on the sides and superiorly; the 

 antenna' % are terminated by a sharp black hook. The thorax 

 is quite black, excepting at times a little yellow line in the middle 

 ii!' the prothorax; the first two segments of the abdomen have 

 often only a very narrow; yellow line, which is sometimes wanting 

 or only indicated by an incomplete line on the margin of the 2d 

 segment. 



Eab. Chili. 



50. O. siibpetiolattls Sapss.— 0. arcualo affinis ; formis simillimus, 

 sed minor ; abdomine subpetiolato, secundo segmento hand tuberculato; 

 primo segmento postice snblatiore ; antennis, tegulis, pedibusque rufis; 

 antennis apice griseis ; puncto frontali lnteo; pronoti margins autioo 



