310 HYMENOPTERA OF AMERICA. [PART T. 



segraentis 2-6 tenuissirue punctatis. Corpus nigrum ; mandibularum 

 apice, tegulis, tibiis tarsisque, ferrugineis ; punctis 2 in summo clvpeo, 

 puncto frontali, puncto utrinque post-oculari, et altero in oculorum sinu, 

 pronoti linea antica interrupta, macula subalari, puncto utrinque iu 

 metanoti deutibus lateralibus abdominisque segmentorum 1', 2' fascia 

 angusta, flavis vel luteis. Alis fusco-uebulosis ; venis fuscis, tegulis 

 flavo-punctatis <j> . — Longit. 10 mm. ; alse, 7.5 mm. 



Oihjn. spinifer Sauss. Revue et'Mag. de Zool. X, 1858, 168, £>. 



Bess. a. diff. — In this species the distribution of the colors is 

 very characteristic. The scutel and post-scutel continue black, 

 although there is a yellow spot under the wing. The yellow 

 spots are all quite small and the bands quite narrow. These 

 ornaments are whitish on the head and thorax, more yellowish on 

 the abdomen. 



This Odynerus resembles 0. scutellaris by its metathoracic 

 erect spines, but the forms are quite different ; the post-scutel is 

 not transversely truncate; the abdomen is more cylindrical; and 

 it is the 1st segment which is the most strongly punctate, just 

 the contrary of what appears in sctitellaris ; the head is more 

 rounded, more convex; the metathorax more excavated, but its 

 concavity is smaller ; the livery is quite different. 



Hub. Brazil, Para. 



B. Metathorax truncate, excavated ; superiorly rt^argincd by an 

 arcuate ridge, rather crenulate, separated on each side from 

 post-scutel by a fissure. 



113. O. Araucanus Sauss. — Parvulus, niger, gracillirans, cribri in- 

 star punctatus ; pronoto valde angulato ; metanoto superne cristulato ; 

 linea scapi, puncto frontali et subalari. tegularum marginibus, litura 

 angusta pronoti marginis antici et post-scutelli, nee nou fasciis 2 abdo- 

 minis, albidis. J . 



Odyn. Araucanus Sauss. Reise. Oester. Fregatte, Novara. Hymenop. 14, 

 13, fig. 8, 9 . 



Total length, 8 mm. ; wing, 5 mm. 



?. Small, slender, cylindrical ; head and thorax densely punc- 

 tate; abdomen rather more finely punctate. Head excavated 

 posteriorly. Prothorax having its angles very sharp. Meta- 

 thorax almost vertically truncate, rugose on its superior part; 

 its hinder face much excavated ; the excavation almost polished, 



