Fvssori'al Ilymcnoptrra of Xorth America. 69 



Head entirely black including the clypeal region and the antennae; 

 mandibles black, growing corneous towards the tips; orbits and clypeal 

 regions silvery. At the lower angle of the meso-scutum on the flanks 

 is a round yellow dot (tubercle), produced upwards into a linear tail- 

 like expansion, pupil led with black; on the meta-scutelluin is a long 

 linear transverse yellow band, which spreads out still further on each 

 side of the posterior edge. Thorax black, coarsely punctured, as is the 

 head and abdomen. Enclosure of propodeutu transversely almost linear, 

 surface with about six deep mitre-shaped fossa; enclosed between high 

 ridges, below irregularly ridged. 



Wings clouded on the outer half. Legs with black coxae and 

 femora, fore femora streaked with yellow beneath aud tipped with yel- 

 low ; tibiae and tarsi yellow, streaked on the. edges with fuscous, 

 especially the fore tibia; which have a broad dark line on the inner 

 Bide. Abdomen black, nearly the whole of the upper surface black, the 

 yellow very lateral spots hardly extendiug on to the tergum. The lateral 

 fasciae occur on the basal five rings and are acutely triangular in form, 

 the sharp apex usually terminating on the outer third of the upper sur- 

 face of each ring, at their bases expanding covering the whole length of 

 the l'ing at the juncture of the tergal portion with the sternite, on their 

 posterior margin deeply excavated, sometimes on the fifth, the fasciae 

 spread out and bathe the hinder edge of the entire upper surface of 

 the ring in yellow; tip black, slightly hirsute. Beneath black; edges 

 of the rings piceous. 



Length of body, .24 — .32; head and thorax together, .17; abdo- 

 men .15 inch. 



Mass., (Sanborn and Norton, Coll. Ent. Soc. Phil.) Illinois, (Coll. 

 Ent. Soc. Phil.) 



Not only by its greatly flattened, short elliptical body, and short, 

 broad large jaws, and its peculiar neuration can this species be easily 

 recognized, but also its jet black coarsely punctured body, the single nar- 

 row linear meta-scutellum with its yellow streak, and the abdominal 

 fascia; being placed on the extreme side, and its entire structure while 

 in some respects reminding us of Oxybelus. clearly forms a connect- 

 ing link uniting Pempliredo aud its allies with Crabro. 



This species is liable to considerable variation in the size of the 

 abdominal fascia;, which are ofteu greatly enlarged and show a ten- 

 dency to approach each other on the tergal surface, and also vary in 

 width. 



