Fossorial Ilymenoptcra of North America. 93 



often yellow outside ; tibiae entirely yellow, or with a dark fuscous 

 stripe on the inside; basal joint of tarsi yellow, terminal ones brown. 



Abdomen smooth, polished, black with three pairs of straight, lanceo- 

 late ovate fasciae, one each ou second, fourth and fifth rings ; basal pair 

 approximate closely on notum, while the third pair meet nearer; hind 

 margin of fifth ring hirsute, tips black hirsute; beneath black. 



Length of body, .40 — 50 ; head and thorax together, .26 ; abdo- 

 men .24 inch. 



Maine, Packard. N. H., (Blake). Mass., Shurtleff, Sanborn, (Coll. 

 Ent. Soc. Phil., Coll. Harris, B. S. N. II.). Canada, N. Y., Penn., 

 Del., 111., Colorado Territory, (Coll. Ent. Soc. Phil.). 



A speci.uen from Canada differs in being a little more hirsute than 

 the others, thus resembling more the $ . All the % %> thus far no- 

 ticed are smaller than the $ • 



As noticed by Mr. Cresson, the specimens from Colorado Territory 

 have a different fades from those found to the eastward. The fasciae 

 are whiter, an ovate yellow spot sometimes appears on the third ring 

 of the abdomen which has also been noticed in a specimen from Illi- 

 nois, and the fasciae on the fifth ring are generally confluent. Again, 

 there are others which are closely similar to the Eastern individuals. 

 In a specimen from New York the thorax is almost entirely black, the 

 single yellow stripe on the meso-scutellum being reduced to two gemi- 

 nate dots. 



The very white striped specimens are immature, as we have noticed 

 a portion of the semi-pupal membrane still attached to the base of the 

 abdomen in an individual of this species from Colorado Territory. 



In Dr. Harris' collection is a cocoon of this species which is a little 

 over half an inch long, of dense consistance, and yet rather thin, 

 regularly cylindrical, red in color. The species burrows in decayed 

 wood. Found thus in willow wood at Dublin, N. H., by Mr. Leonerd, 

 June 10. — Dr. Harris' notes. See also Win. Cowpers notes on the 

 habits of this species, Can. Nat. Geol., Dec, 1865, fig. 4, 5, identified 

 from a specimen kindly forwarded by him. 



This, our most common species will be easily recognized by the 

 absence of any fasciae on the third abdominal segment, and by its 

 ovate subpeduuculate abdomen. 



Crabro trifasciatus, Say. 



Crabro trifasciatus, Say, Keating's Xarr. Long's Exp. App. p. 342. (1824.) 

 Smith, Cat. Hyra. Br. Mas. iv. p. 419. (1856.) 

 % . Closely approaches C. Q-maculatus, but the body and especially 

 the abdumen, is flatter, and as a rule there is present an abbreviated 



