Fossorial ITi/menoptera of North America. 379 



narrower than usual, much more remote, slightly excavated above; an- 

 tennal groove broad and deep, with wide, flat orbits. Clypeus longer 

 than broad, large, broad, front edge of the entire clypeal region deeply 

 arcuate. Clypeus elongate and produced into a large round lobe, with 

 inrolled edges, slightly carinated towards the base. Palpi weak, joints 

 very slender. 3Iaxillary palpi four-jointed. Labial palpi very short, 

 terminal joint long and slender, cylindrical. Mandibles much as usual, 

 a denticle on each side of the oral region, opposite the base of the labi- 

 um. Antennae short, 14-joiuted, scape short and broad, much swollen; 

 2nd joint of flagellum nearly as long as the scape itself, pinced at base, 

 expanding into a broad lateral lobe; 3rd joint like 2nd, but one-third 

 shorter; succeeding joints shorter than broad, sutures well defined, 

 terminal joints short, obconic. Thorax much as in Blepliaripiis, but a 

 little more elongated posteriorly, flanks of mesothorax very full and 

 convex, while the region behind is narrower and more contracted than 

 usual. Propodeum with a smooth, seini-ovate space above, not striated 

 on the sides, but smooth, with a delicate pubescence, thus differiug 

 from Blepharipus where this part is rugose and striated. Wings with 

 the first sub-costal interspace much broader than in Blepharipus, and 

 more irregular, six-sided; second median space very broad, half as broad 

 as long, being broader than in Blepharipus and Crabro ; outer side of 

 sub-median space, curved, scarcely angulated. Two anterior pairs of 

 legs very small and slender, posterior pair greatly enlarged, tibia) cla- 

 vate, greatly thickened, cylindrical towards the tips, while the tarsi 

 vary in being long and slender, or unusually short, half shorter, and in 

 proportion much broader than in Blepharipus. 



Abdomen pedicellate, much longer than head and thorax together, 

 basal joint being full as long as the abdomen is broad, clavate, forming 

 a node at the posterior end; body of the abdomen long ovate, nearly 

 equalling in length the head and thorax together, cylindrical, convex 

 above and beneath ; tip more acutely spatulate than usual ; size 

 small. 



$ agrees with the male in the wing characters, the abdomen being 

 also pedicellate. In the head characters it agrees closely with Bl< pha- 

 ripus, but still the front is broader, the eyes being a little more remote, 

 the clypeal region much narrower, and consequently the clypeus itself 

 much longer, with the front edge produced into an acutely angulated 

 lobe. Antennae shorter, sutures distinct ; meso-scutellum more trans- 

 verse, being shorter than in % ; tip of abdomen much broader than in 

 Bbpharipus. The pedicellate abdomen, which is longer than the head 



