220 HYMENOPTERA 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 precedent:, ferrugineis. 

 Variat. Thoracis et abdominis lituris rudimentariis, incompletis, paeue 



null is, vel pronoto nigro. 



Odynerus arcuatus Sacss. 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 most closely allied to 0. vestitus and excipiendus (Comp. 

 these species). 



Sab. Chili. 



49. O. excipiendus Spin. — Niger, velutinus, 0. arcuato similliraus, 

 sed metanoto postice magis punctato ; abdominis primo segmentosupeme 

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

 mentis 1°, 2° luteo- marginatis, vel fere omnino nigris ; antennis nigris ; 

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

 14 mm. 



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

 £. Clypeo emarginato, luteo, nigro-piloso, utrinque nigro-marginato ; 

 antennarum uncino nigro. 

 Eumenes excipienda Spin, in Gay's Hist, fisic de Chile, Zool. VI, 266, 



1 (1851). 

 Odynerus excipiendus Sauss. Vespides, I, 161, 47 ; III, 22". 

 Odynerus colueolo Sauss. ibid. I, 161, 46 (1S52) ; III, 227.— Gay's Hist, 

 fis. 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 black on the sides and superiorly ; the 

 antennae % are terminated by a sharp black hook. The thorax 

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

 of the protborax ; 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. 



Hob. Chili. 



50. O. SllbpetiolatllS SArss. — 0. arcuato affinis; formis simillimus, 

 sed minor ; abdomine subpetiolato, secundo segmento hand tuberculato; 

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

 antennis apice griseis ; puncto frontali lnteo; pionoti raargine antico 



