NORTH AMERICAN HYMENOPTERA. 149 



Washington ; Southern California (O. B. Johnson and D. W. 

 Coquillett) ; Nevada; Arizona; Colorado. Easily distinguished by 

 the strong spine with which the pronotum is armed on each side. 



19. Crabro rufipes St. F. et Br. 



Ceratocohis rufijjes St. Farg. et Brulle, Anu. Soc. Ent. Fr. iii (1834), p. 741, 9 • 



Crabro rnfipes Smith, Cat. Hym. Brit. Mus., iv, p. 418. 



Crnhro excdvatus Fox, Ent. News, iii, p. 10, '^ % . 

 9. — Head with large, separated punctures, closer in front; space between the 

 eyes at base of clypeus somewhat less than the width of the latter in the middle : 

 space between hind ocelli about equal to or slightly greater than that between 

 them and the nearest eye-margin ; pronotum not dentate laterally ; dorsulum 

 rugosely punctured, sparsest posteriorly ; mesopleurse not as coarsely striato- 

 punctate as in scaber ; middle segment above coarsely and closely punctured, 

 posteriorly more or less rugose, sides coriaceous, indistinctly striated ; first and 

 second dorsal segments with large, separated punctures, those on the first strongest, 

 the puuctures finer and closer on the other segments; second ventral segment 

 with the punctures le.ss scattered and not as strong as in scaber. Black ; mandibles 

 except apex, scape, pedicellum, first joint of flagellujn more or less, pronotum 

 narrowly interrupted medially, tubercles, episternum mesopleuralis in part, scu- 

 tellum, metanotum, fore and medial femora and tibije in part sometimes, and a 

 spot at each side of dorsal abdominal segments 1-5, yellow; the abdominal spots 

 variable : that on the first segment sometimes wanting and the others greatly 

 reduced in size, or the spots on segment 5 may be united into a band ; legs in 

 greater part, including the trochanters sometimes, entirely rufous, and the first 

 and second segments of abdomen frequently sutfused with that color. Length 

 8-9 mm. 



% . — Eesembles greatly that of scaber, but the front is less coarsely and more 

 closely punctured, the punctures being more or less confluent ; space between eyes 

 at base of clypeus distinctly greater than the width of the latter in the middle ; 

 thorax about as in scaber; first joint of medial tarsi not curved; punctui-es of 

 second ventral segment finer and closer than those of the first dorsal ; colored 

 like the 9 • Length 9 mm. 



Carolina (St. Fargeau) ; Georgia; St. Augustine (Johnson) and 

 Jacksonville (Ashmead), Florida. St. Fargeau gives the color of 

 the legs of this species as black, but this mu.st be a mistake, or he 

 would not have named it rufipes. 



20. Crabro scaber St. F. et Br. 



Sijleniiis scaber Lepelitier de Saint Fargeau et Brulle, Ann. Soc. Ent. Fr. 

 iii (1834), p. 715, S • 



Crabro scaber Smith, Cat. Hym. Brit. Mus., iv, p. 418. 



Crabro scaber Packard, 1. c, p. 114, 9 • 

 9 . — Head with strong, much separated punctures, closest in front ; space be- 

 tween the eyes at base of clypeus equal to the width of the latter in the middle; 

 space between hind ocelli less than that between them and the nearest eye-margin ; 

 pronotum distinctly margined above, but very indistinctly dentate at the sides ; 

 dorsulum rugosely punctured, sparsest posteriorly ; mesopleuraj coarsely striato- 

 punctate ; middle segment above coarsely and closely punctured, the posterior 



TRANS. AM. ENT. SOC. XXII. JUNE. 1895. 



