104 Dr. A. S. Packard, JVs Revision of the 



This species is characterized by the unusual convexity of the vertex, 

 the ocelli being more curved together and raised more than usual ; 

 eyes more globose, and in front nearer together, also by the unusual 

 style of sculpturing of the propodeum ; the legs are brown, as in the 

 abdomen beneath. 



From 0. parvulus it may be easily known by the head characters 

 already referred to, and by the distinctly carinate prothorax, while the 

 propodeum is much more coarsely ridged, and the legs are brown, in- 

 stead of black, a little stouter, and the two terminal abdominal bands 

 in the present species, become in C. parvulus two pairs of remote lateral 

 fasciae. 



A specimen from Maine has nearly black femora, and the terminal 

 fascia is nearly obsolete ; also the abdomen is larger and a little 

 broader than in the specimen from Pennsylvania. 



Another % specimen which I captured in the Glen, White Moun- 

 tains, N. H., last August on the flowers of the Golden Rod, has no 

 terminal continous fascias, but remote lateral spots; the fore femora are 

 fuscous in front, and the tips of both the anterior pairs are yellow, 

 and the mesial furrow on the propodeum is much narrower than in 

 the southern specimen — while the antennae are stained black on 

 the inner side of the scape, and the prothorax is distinctly yellow, 

 spotted on each side. 



Crabro effossusn, n. sp. 



% . Head short, one-half as long as broad, sides narrowing behind 

 the eyes more than is usual, vertex convex as usual; ocelli contiguous, 

 in a low triangle, in front a deeply impressed line leading to the deep, 

 smooth, broad antenna! groove. Surface coarsely punctulated, orbits 

 and clypeal region with a coarse silvery pubescence : head narrows in 

 front rapidly to the insertion of the jaws; clypeal region narrow, cly- 

 peus long, well carinated. Mandibles black, scape as usual, entirely 

 yellow; flagellum black second and third joints with a terminal promi- 

 nent stout tooth beneath. 



Prothorax flattened, not carinated, surface smooth and broad, an- 

 tero-posteriorly, yellow; on the mesoscutum the mesial raphe and 

 submesial ridges well marked ; tubercle yellow, coarsely punctured ; 

 scutellum puncto-striated, black; meta-scutellum smooth; with a yellow 

 stripe. Thoracic abdominal ring with no distinct enclosure, with a 

 deeply and irregular net-work of large deep fossae ; on the short hori- 

 zontal, slightly enclosed space, they are long and narrow, below there 

 are high transverse and longitudinal ridges, enclosing square and 



