352 HYMENOPTERA OF AMERICA. [PART I. 



abdomine gracili, punctato ; antennis et clypeo oranino atris ; puncto 

 frontali, macnlis 2 pronoti, tegulis partial, post-scutello et abdominis 

 segmentorum 1', 2' margins sat late, flavis ; tertii fascia flava abbre- 

 viata ; pedibus nigris, tibii.s flavis, tarsis fuscis ; alis subinfuscatis. 

 O. — Longit. 9.5 mm. 

 Odyn. Huro Saoss. Et. Vespid., Ill, 297, 185, O (1854). 



Ilab. United States. 



148. O. MoJiicaims Sauss. — Minutns, gracilis, punctatus, niger; 

 puncto frontali et post-oculari, maculis 2 pronoti, post-scutello abdo- 

 minisque segmentorum 1', 2' limbo, flavis. Tibiis flavis, tarsis fuscis. 

 Alis hyalinis venis fuscis. — Longit. 8 mm. 



%. Clypeo discoi'dali, flavo, subemarginato ; puncto in labro et fascia in 

 scapo flavis ; antennis subtus ferrugineis. 

 Odyn. Mohicanus Sauss. Et. Vespid., Ill, 297, 185, % (1854). 



Bab. United States. State of New York. 



III. Metathorax not produced superiorly beyond the post-scutel, 



convex; its hinder fare parted by a deep groove. Post- 

 scutel truncate ; having a superior transverse face and 

 a posterior vertical or oblique face ; the two faces separated 

 by a sharp edge. 

 Form quite elongate, exactly the same as in the last subdivision 

 (II, 3), 1 very slender, elongate; the abdomen slender, 

 spindle-shaped; its first segment funnel-shaped. Post- 

 scutel always black; scutel often marked with yellow. — 

 Insects small, black, shining, with pale ornaments. 



These insects have much the appearance of those of the group 

 of 0. Totonacus, but the prothorax is raarginate anteriorly and 

 the scutel is maculate, not the post-scutel. 



A. Metathorax quite ununited superiorly. 



149. O. Acolliuus Sauss. — Parvulus. gracillimus, elongatus, niger, 

 cribrato-punctatus ; pronoto antice cristato-bidentato ; post-scutello 

 truncato, elevato-cristato ; metanoto tenuiter punctato, inermi, bicon- 

 vexo, per sulcum partito; abdominis primo segmento infundibuliformi, 

 valde punctato, basi paulum petiolato, utrinque snbdentato, supra tumido, 

 aiue marginem transversim subcanaliculato ; secundo paulo depresso, 

 basi coarctato; reliquis vix punctatis ; pronoto, scutello abdominisque 

 seguientis 1°, 20, vel 1°, 2°, 4°, flavo-marginatis ; macula subalari 



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