Foisorial Bymenoptera of North America. 373 



as usual, mandibles scarcely differ, black, tips piceous. Antennae 

 .stouter, scape clavate. angular, entirely yellow ; flagcllum black. 

 thicker than usual, sutures well defined. 



Prothorax narrow above, not rounded on the sides, with a yellow 

 interrupted stripe, thorax polished, minutely punctured, polished. 

 Seutellum with, or without a lunate spot; rueta-scutelluin black, 

 minutely punctured like the niesoscutuin. Lunate enclosure smooth, 

 highly polished, not striated, divided by the mesial furrow into two 

 quadrant-shaped areas ; at the base of the segment a row of small 

 fossae, which are repeated on the posterior edge of same enclosure ; 

 the furrow widens towards the base of the enclosure so as to include 

 two of the fossae. Sides of the segment behind bounded by a high 

 ridge, giving a trapezoidal form to this area, while within are slight 

 transverse ridges at the bottom, and above, the coarse surface is minute- 

 ly and sparsely punctured. Tegulse dark testaceous, wings with the 

 costal nervures blackish, and posterior ones rufous; pterostigma black; 

 two costal discolorations, one spot fuscous at the outer end of the first 

 median area, the other at the middle of the outer costal area; another 

 slight discoloration at the lower end of the first sub-costal area. Fore 

 and middle femora black, broadly tipped with yellow; hind femora 

 black; tibiae yellow, brown beneath, especially the middle pair; hind 

 tibia; sometimes ringed at tip with brown-black ; tarsi yellow, apical 

 joints of middle and hind pair fuscous. 



Abdomen shorter than the rest of the body, polished, black; beneath 

 flattened, above convex, in 9 it is broadly ovate. Basal ring immacu- 

 late. % with five, 9 with four straight yellow fascire nearly meeting 

 above; 3rd pair the most remote. In % the fourth pair are narrowest, 

 in 9 the) r are broadest, sub-orbicular, and almost connected. 9 ■ Tip 

 short and broad, nearly equilaterally triangular, compressed at extreme 

 tip and slightly grooved. 



Length of body, % , .30 — .42, 9 , .44 ; head and thorax together, 

 % .2(1—24, 9 .27; abdomen % , .16— .18, 9 .2U inch. 



Andover, Mass. (Sanborn). Cambridge, Mass. (Coll. Harris). Mass. 

 and Maine, (Norton and Packard). 



This species is easily distinguished from all the others of this genus 

 by its large size and spotted wings. In one case it differs in the size 

 of the antennae, in the fore femora being yellow at tip, reddish beneath, 

 and black at base; in another specimen the same joints are entirely 

 black. In the % specimen collected by Dr. Harris, which is larger 

 than the others, the antennae are slenderer and more filiform. The 



