Fossorlal JL/menoptcra of North America. 101 



Length of body, .38 ; head and thorax together, 20 ; abdomen, .18 

 inch. 



Conn., (Norton). Penn., (Coll. Ent. Soc. Phil). 



In its general form and structure this species, like the following one, 

 connects G. quadricepa with the more genuine Crabroues. Its golden 

 tint and long clypeus, the sculpturing of the propodeum and long, 

 smooth, slightly dilated femora, and eight acute narrow abdominal 

 fasci;o. and the pointed, deeply channelled tip, together with its rather 

 small size, will readily enable this interesting species to be recognized. 



The specimens received from Mr. Norton differ from the others in 

 having broader fasciae which are a little more contiguous above, while 

 the most posterior band is broader and united in the middle. 



Crabro montanus.. Cresson. 



C. montanus, Cresson, Proc. iv. p. 484. (1865.) 



Colorado Territory, (Coll. Ent. Soc. Phil.). 



Crabro contiguus Cresson. 



C. contiguus, Cresson, Proc. iv. p. 484. (1865.) 



Colorado Territory, (Coll. Ent. Soc. Phil.). 



Group R. 

 Crabro cristatus. n. sp. 



% . Head cubical, two-thirds as long as broad, hardly narrowing be- 

 hind more than in females generally in this genus; vertex broad con- 

 vex, especially at site of ocelli, which are arranged in a low triangle, 

 and are quite contiguous ; front narrow, eyes converging a little more 

 than usual, antcnnal groove bounded above by a broad and deep ridge 

 angular at bottom, orbits lined with a slight silvery pubescence; cly- 

 peal region silvery, of the average width ; clypeus itself three-fourths 

 as long as broad, well carinated. Mandibles entirely black or yel- 

 lowish in the middle, on inner edge a large triangular acute tooth. 

 Antennae unusually stout, scape broadly dilated and slightly hirsute 

 on edge, angulated, black brown with ferruginous tinge on the inside 

 and on whole basal third, yellow towards tip, first and third joints of 

 antennae ferruginous, darker at base; joints of flagellum short and 

 thick, five basal joints dentate beneath. Surface of head rather 

 coarsely puncto-striated. 



Prothorax square, well crested, carina ending in an acute angle; on 

 each side a yellow ovate fascia enclosing the carina. Surface of the nieso- 

 scutum with unusually large, coarse punctures and longitudinal raised, 

 Irregular Hues; two submcsial ridges very prominent, and terminating in 

 slight lines to hinder edge of scutum; tubercles slightly pupilled with 



