21 G HYMENOPTERA OF AMERICA. [PART T. 



from the more slender types which form a passage from Nortonia 

 up to the more blunted species which seem to form a transition 

 from Vespa (0. vespiformia). 



These singular Odyneri form the fauna of Chili and of the 

 western face of the Andes. They continue, however, to overleap 

 the chain of the Andes, to show themselves in the Argentine 

 Republic, for the 0. albocinctus is proved to inhabit that country 

 on the western slope of South America. 



Some analogous types extend upon the side of the Equator and 

 of New Grenada, and appear to pause toward the direction of 

 Venezuela. But yet these offer some altered characters, the 

 markings become golden-yellow (0. Romandinus), and the forms 

 are generally more like those of the Division Odynerus. 



If the Hypodynerus form the foundation of the fauna of the 

 Odyneri of the southern coast of the Pacific, they are not, how- 

 ever, the unique type of that region. One finds there, also, the 

 Ancistrocerus (0. scabriusculus, ambiguus, etc.) and the true 

 Odynerus (0. Gayi, 0. Peruensis, etc.). But as we have indicated 

 above, the characters of the livery w r hich are so marked among 

 the Hypodynerus, reproduce themselves more or less among all 

 the solitary wasps of Chili, 1 although they do not continue among 

 the hymenoptera of other families which inhabit the same countries. 



In the arrangement of species, I have here followed the series 

 created by the modification of forms, commencing with the more 

 lengthened, and finishing with the more blunted. 



I give the complete diagnosis of the species w T hich I possess, 

 but I must limit myself to some short diagnostic phrases for those 

 which I have not before my eyes. 



Table to assist in distinguishing the species of the Division Hypodynerus. 



1. Wings fuscous with violet or cloudy reflections. 



2. Body and antennae quite black ; 1st abd. segment funnel-shaped. 



47. Tapiensis 



2, 2. Body ornamented with luteous bands ; abdomen sessile. 



3. Antenna? and feet rufous. 59. villosus. 



3, 3. Antennae black, the scape rufous; feet rufous, obscure, passing 



into black. 60. obscuripennis. 



1, 1. Wings ferruginous, with the extremity fusco-violaceus. 

 2. Protliorax rufous. 



3. Antennae rufous, with the extremity black. 



1 Compare the former page 13, gayella ; 50 No. 45 ; 162 No. 9, etc. 



