238 11YMEX0PTERA OF AMERICA. [?APT I. 



b. Superior edges of metathoraz sharp. 



71. O. "bracliygaster Sauss. — Niger, valde panctatas, omnino falvo- 

 velatinus ; metathoracis excavatione lata, laeyi, argeuteo-sericea, atria- 

 que obtnsangnlata, snperne canthis arcuatis acutis uiargiuata ; his a post- 

 scutello per fissuraui utrinque sej unctis ; abdomine ovato, basi truncato ; 

 capite omnino nigro; pronoti marginibus obsolete, tegulis partial, post- 

 scutello, puncto snbalari et punctis 2 iu aagalis scutelli, metathoracis 

 canthis saperioribas abdominisqne seguieutoruui l'-S 1 limbo, fulvis ; 

 primi fascia angasta, 2' lata; 2' margine late crasse puactato ; pedibas 

 nigris, artibas, tarsis et mandibularam apice obscaro-rufescentibus ; 

 tibiis auticis fulvo-variis ; alis subhyalinis, basi et costa sabferragiueis 

 apice griseis. — J. Clypeo bideatato, deutibas inter se distantibus, 

 runs.— $ ?. 



Odi/n. brachyyastcr Sauss. Et. Vespid. I, 173, 63, pi. xvii, fig. 8 (1S52). 

 —Rev. Zool. V, 1858, 1G7, 5. 



Var.? Margins of the abdominal segments narrow; antenna? 

 ferruginous beneath ; wings hyaline, with fuscous veins. 



Yery similar to 0. nasidens ; but also very distinct, the abdo- 

 men not being as conical and the 2d segment more elongate ; the 

 an ten nee are also more slender. 



Hab. Brazil. (Paris Museum and coll. of author.) 



This can be well distinguished from Ghartergus chartarius 

 (social wasp) b} r its truncate or bidentate clypeus (not angulate), 

 its long mandibles, its wider first abdominal segment, etc. 



72. O. Guadulpensis Sauss.— Niger, valde panctatas ; capite et 

 thorace ragosis, abdominis segmenti 2' margine et sequeatibns valde 

 panctatis; linea mandibalaram et scapi, macala froatali,pronoto omnino 

 snperne, tegalis, macala snbalari, macalis 2 scatelli, post-scatello 

 metauoto utrinque, flavis; abdominis segmentis 13, 2^ llavo-marginatis, 

 primi fascia utrinque aucta; segmentis 3-5 superne fulvo, subtus flavo, 

 tenaiter limbatis ; tibiis et tarsis flavis ; alis flavescentibus apice infu- 

 uiatis — £. Clypeo flavo, nigro-maculato. — £. Clypeo truncato, poly- 

 gonali, flavo. 



Variat. Pronoti angulis posticis nigris. 



O. cubensi affiaissimus ; ab illo distincte differt: statara paulo minore ; 

 maadibalis nigiis, navo-notatis ; pronoto frequenter omnino flavo ; 

 antennaram scapo nigro, linea fiava ornato; coxis et femoribus nigris ; 

 abdominis primo segmento haud acute truncato 1 ; segmentis 3-6 nigris 

 tenuiter flavo-marginatis. 



Odyn. Guadulpensis Sauss. Et. Wspides, i, 182, 76 (1852). 



1 In our % specimen the first segment offers a sort of suture, but this, 

 I think, may be a mere accident of paactaration. 



