7-1 Dr. A. S. Packard, Jr's Revision of the 



J . A dorsal and lateral linear stripe on third abdo- 

 minal ring; scutellum black. Clyj^eus golden, 

 sides silvery ; body roughened C. scaber, St. Farg. 



Group A. 

 The body is shorter and more compact, the head is more cubical 

 than in C. 6-maculatus, or C. sejJtentrionalis, the frout is not excavated 

 so much as usual in Crabro ; eyes narrower than usual, the head nar- 

 rows towards the clypeal region more than usual, hence the clypeal re- 

 gion is narrower, the antennas are shorter and more clavate. The wing 

 characters do not present any differences of value. Prothorax angu- 

 lated on the sides, and the body is more coarsely punctured than 

 in any of the succeeding species. 



C. interruptus, St. Fargeau. 



Solenius interruptus, St. Farg., et Brulle. Ann. Soe. Ent. France, iii. p. 716. 

 (1S34.) 



St. Farg. N". H. Hym. iii. p. 122. (1845.) 

 Crabro confiuentus, Say, Bost. Jour. Nat. Hist. i. p. 376. (1837.) 

 % . Crabro dubius, Smith, Cat. Hym. Br. Mus. iv. p. 417. (1856.) 



Crabro confluentus, Smith, Cat. Hym. Br. Mus. iv. p. 420. (185G.) 



% . Head subcubical, two-thirds as long as broad, narrowing a little 

 behind, surface convex; ocelli in an equilateral triangle, not channelled 

 in front, except at the antennal groove, which is deep and lined on the 

 sides with a silvery pubescence; clypeus nearly as long as broad, 

 covered with a silvery pubescence, clypeal region very narrow. Man- 

 dibles black, stained with ferruginous in the middle. Antennae short, 

 thickened especially towards end; scape long clavate yellow, with a 

 dark stain on the upper side; basal joint of flagellum yellow, stained 

 with ferruginous above, second to fourth joints brown, becoming brown- 

 black towards tip. Surface of body covered with unusually large and 

 deep punctures. 



Prothorax long, angulated in front, edge emarginate, raised; lateral 

 tubercle conspicuous, yellow, pupilled with black, meso-scutum broad, 

 with a short raised line on the anterior margin ; no submesial or parap- 

 sidal grooves present; scutellum with two yellow spots, often entirely 

 black; postscutellum with a transversure line. Enclosure of propodeum 

 obsolete, entire segment very coarsely and irregularly punctured, being 

 larger than on anterior rings. Tegulre testaceous, basal wing pieces 

 black, wings clear, hardly smoky, nervures bright ferruginous. 

 Femora yellow at tip, especially beneath, and most broadly tipped 

 with yellow in fore legs ; tibiae yellow, touched with brown within 

 especially on hind tibiae ; tarsi yellow, tinged with ferruginous towards 

 ungues. 



