156 IIY.MEXOPTEItA OF AMERICA. [PART I. 



low livery of its abdomen. It closely recalls the 0. bifasciatus 

 Fabr , although its head is narrower and its clypeus more emar- 

 ginate. It also closely approaches the O. debilitatus Sauss., 

 which has nearly the same form of head, but which is less slender 

 and has the thorax especially, much more strongly spinose. 



Ilab. United States. Connecticut. Wisconsin. Illinois. 



I owe this interesting species to the kindness of Mr. Edward 

 Norton and Mr. B. D. Walsh. 



5. S. pin Dili! US Sauss. — Gracilis, niger, nitidus, tenuiter punctatus ; 

 pronoto biangulato; post-scutello et metanoto rugosis ; illo postice ex- 

 cavato, antice paalum altiore et utrinqae in lateribus cannula longi- 

 tudinali niarginato; hoc profunde excavato, foveola elevato-tnarginata 

 instructo ; mesonoto valde sulcato ; scutello sulco valde partito ; abdomi- 

 nis priino segmento elongato, sutura valde prominula instructo, superne 

 yugosissiine punctato et sulco obsoleto diviso ; segmentis reliquis niti- 

 dissimis ; puncto frontali et post-oculari, maculis 2 pronoti, 2 scutelli, 

 puncto subalari, limboqae spgmentorum abdominis omnium, flavis ; 

 (seginentorura 3-5 fascia undulata submarginali); pedibus nigris, tibiis 

 tarsisque flavis ; alis hyalinis, venis ferrugineis. % . Clypeo rotundato, 

 bidentato; mandibulis et scapo antice fascia fiava. Longit, 9 mm. 



Odgn. pumilus Sauss. Vespides, III, 1854, 197, 93. 

 Hab. Peru. (The author's collection.) 



6. S. cristatus Sauss. — Sat parvus, niger, 0. murario formis similis; 

 metanoto rugoso ; abdominis primo segmento sat gros3e punctato, sutura 

 elevata, secundo latiore, basi punctato ; puncto frontali, maculis 2 pro- 

 noti, fascia interrupta scutelli, macula subalari, flavis vel rufis; abdo- 

 minis segmentis 1, 2, 4 sulfureo lirabatis ; tibiis tarsisque ferrugineo- 

 variis; alis hyalinis, venis fuscis, radio ferrugineo. J. Long. 9 mm. 



Odgnerus cristatus Sauss. Vespides, III, 196, 92, £• 



Hab. North America. 



This species appears to me to be very nearly, if not wholly 

 identical with 0. Philadelphia^. 



■7. S. Canadensis Sauss. — Parvnlus, niger, gracilis, rugosus ; puncto 

 frontali, maculis 2 pronoti, 2 scutelli, macula subalari, abdominisque 

 limbo segmentorum 1', 2', 4', flavis; tegulis fuscis; capite in Sato, 

 antennis infere insertis ; abdominis secundo segmento angusto, vix 

 latiore quam primum; alis hyalinis, apice fuscescentibus. 9 • Longit, 

 8 mm. 

 Odijnerus canadensis Sauss. Vespides, III, 196, 91, £>• 



Hab. Canada. 





