82 Dr. A. S. Packard, Jr's Revision of the 



thorax together; on two basal segments a pair of fasciae, broadly ovate 

 on second ring, those on first ring very sinuate; fasciae on third ring 

 either separate or united ; continuous narrow bands on three succeed- 

 ing rings, smooth on the hinder edge ; terminal one deeply excavated 

 behind, and sometimes nearly obsolete; tip short and subpunctate; be- 

 neath, the hinder edge of all the rings are pale brown, almost testa- 

 ceous. 



Length of body, .36; head and thorax together, .20; abdomen, .16 

 inch. 



$ . Head unusually broad, narrowing behind unusually, being a little 

 more than one-half as long as broad. Eyes remote, ocelli situated in a 

 low triangle; surface of vertex very convex, slightly channelled in front 

 of the middle ocellus; antennal groove well marked; on each side broadly 

 lined with a silvery pubescence, in some lights reflecting a slightly 

 golden hue; clypeal region silvery, on clypeus itself slightly yellowish; 

 joints of antennas entire, otherwise as described in male. Prothorax 

 cariuated ; two geminate yellow spots on mesoscutellum and a lateral 

 dot on each side towards the insertion of the wings. Enclosure of pro- 

 podeum quite smooth, with radiating fine lines marking off the limits 

 of the area. Abdomen fasciated on each ring, those on the third, fourth 

 and fifth rings forming continuous bands. 



Illinois, (Coll. Ent. Soc. Phil.). 



Crabro chrysarginus, St. Farg. 



C. chr-ysarginus, St. Farg. Ann. Soc. Ent. France, iii. p. 711. (1834.) 

 C. arcuatus, Say. Bost. Jour. Nat. Hist. i. p. 377. (1837.) 

 9 • C. dirysarginus, St. Farg. H. N. Hym. iii. p. 114. (1845.) 

 C. chrysarginus, Dahlb. Hym. Eur. i. p. 386, 257. (1845.) 

 C. chrysarginus, Smith, Cat. Hym. Br. Mus. iv. p. 420. (1S56.) 

 % . Vertex, broad, convex; eyes, smaller than usual, do not reach 

 to middle of vertex ; ocelli arranged in a low triangle or curved line ; 

 surface finely punctured; just in front of the ocelli sparsely hairy; 

 orbits very broadly lined with a silvery pile nearly meeting in the 

 middle of the antennal groove; clypeal region silvery. Mandibles 

 yellow, tips either black or piceous, antennae unusually long and 

 slender, scape yellow, a little swollen within, where is a dark brown 

 stripe; basal joint of flagelluui very long, yellowish at tip, second 

 joint very long, being nearly two-thirds as long as the scape, at its 

 base suddenly contracted as if pinched, being concave beneath; re- 

 maining joints nodose toward tips, fifth with a large tooth beneath. 



Thorax finely punctured, a silvery pile on the flanks thicker than 

 usual; on prothorax are interrupted yellow stripes; tubercle yellow, te- 



