292 HYMENOPTERA OF AMERICA. [PART I, 



b. Posterior plate of metathorax more flattened ; its margins rounded 

 and punctured. 



* Abdomen conical, principally among Uie females. 



106. O. pratensis Sauss. — Pallide-ferrugineus, citrino multipictus ; 

 thorace polito, grosse et sparse punctato; metanoto roturidato, dense 

 punctato, velutino, utrinque inermi, superne cantbis nullis, foveola 

 striata minuta orbiculari ; abdomine conico, segmeBtorum 2 i -5 i J, 

 2'-6' % margiue punctis fuscis crassis sparse cribrato; clypeo paulo 

 latiore quam longiore, truncato; antennis basi aurantiis, in dimidio 

 terniinali superne nigris vel fascis ; abdominis segmentorum 1', 2 1 fascia 

 marginali citrina utrinque dilatata. 



Odijn. pratensis Sauss. Revue et Mag. de Zool. XXII, 1870, 61, 20, J %. 



9 . Total lengtb, 15 mm. ; wing, 11 mm. 

 % . Total length, 12 mm. ; wing, 9 mm. 



9 . Size a little superior to that of the 0. foraminatus. Punc- 

 tures of body of little depth, but quite coarse. Scutel smooth, 

 with some coarse, separated, irregular punctures. Post-scutel 

 crenulate. Metathorax rounded, offering a little circular, striate 

 concavity; but its circumference is perfectly rounded, densely 

 punctured, without any spiniform angle, nor any ridge ; not form- 

 ing behind the post-scutel any kind of teeth, and velvety. Abdo- 

 men 9 very conical, truncate anteriorly, but without sharp ridge. 

 Border of segments 2-5 1 (&-&, %) cribrose, with very gross 

 impressed points, a little separated, brown in their depth, and 

 forming on the 2d segment an impressed zone. 



Insect of a ferruginous orange, garnished with yellow or gray 

 hair; mandibles, clypeus, the whole face, and a little post-ocular 

 space, sulphur-yellow; a brown band on the vertex; antennae 

 red, clouded with yellow, with their second moiety black above, 

 and the scape adorned with a yellow line. Middle of the pro- 

 thorax, a spot under the wing, tegulas, post-scutel, and sides of 

 metathorax, yellow; scutel orange, varied with yellow; disk of 

 mesothorax red, clouded with brown. All the segments of the 

 abdomen widely bordered with yellow; bordering of 1st and 2d 

 squarely widened on the sides; anus yellow ; femora and tibise 

 varied with yellow. Wings transparent, gray at the end, a little 

 ferruginous along the side. 



Var. a. Mesothorax obscure, with two ferruginous lines. 



6. Yellow bordering of prothorax complete. 



