ODYNERUS. 211 



45. A. advena Sauss. — Gracilis, cylindricus, punctatus, niger, tborace 

 antice lato, angulato, postice attenuate; inetathorace paulum ultra post- 

 scutelluin producto, ti'unoato, i'oveola superne semicirculariter acute 

 marginata, margine utrinque iufere angulato; 1° segmento angustiore 

 quam 2nm, antice truncato; 2° supeme basi coarctato, subtuberculato; 

 antennis fulvis, flagello superne nigra; capitis inaculis, pronoti margine 

 antico et postico, macula subalari et praescutellari, tegulis partim, 

 metanoti abdominisque segmentorum marginibus anguste, flavii ; piiini 

 segnienti fascia utrinque lateraliter continuata; pedibus flavis, nigrc- 

 variis ; alis infumatis. 9 • Lougit. 9 mm. 



Odynerus advena Sauss. Et. Vesp. Ill, 222, 117; pi. xi, fig. 3, 4, $ . 

 Hab. — Brasilia (Typus in Mus. Londinensi). 



Division ANCISTROCEROIDES. 

 (Ancistroceroides Sauss. Et. Vesp. Ill, 221; I, 146, III e Divis.) 



Second cubital cell of the anterior •icing subpedunculate. {Me- 

 talhorax excavated, armed on each side with a spine.) 



46. A. alastoroides Sauss. — Gracilis, niger; capite et tborace punc- 

 tatis ; clypeo £ bidentato ; pronoto antice lato, quadratim secto, post- 

 scutellb bituberculato ; metatborace valde excavato, acute margin ato, 

 utrinque spinoso ; abdomine sericante, in basi 2' segnienti constricto; 

 1° segmento superne sulco partito; clypeo, puncto mandibularum, 

 puncto frontali et post-oculari, orbitis internis, linea scapi, pronoti 

 margine postico, macula subalari, linea utrinque metanoti in fere et 

 fascia scutelli, flavis; antennis subtus et tegulis fuscis; abdominis 

 segmentis 10-30 flavo-limbatis ; pedibus fuscis, flavo-lineatis; alis in- 

 infumatis. £ Longit. 10 mm. 



Odynerus alastoroides Sadss. Et. Vesp. I, 147, 33, %. 



Hab. Montevideo. 



This species might almost be placed in the genus Alastor (sub- 

 genus Alastoroides), where it would form a section, characterized 

 by the 2d cell of the wing being subpedunculate only, and by 

 the presence of spines on the metathorax. 



