188 E. T. CRESSON. 



Face more or less white. 

 Abdomen black, the second segment not more coarsely sculptured at 



base 7. ultus. 



Abdomen blue-black, the second segment coarsely and longitudinally 



rugose on basal middle 8. stadaconensis. 



Legs honey-yellow. 



Face, posterior tibise and their tarsi black 12. illietabilis. 



Face yellow; posterior coxae, tips of their tibiae and their tarsi more or 



less black 13. luctns. 



Abdomen black, the two or three apical segments more or less marked with 



white 4. iinprovisiis. 



Abdomen black, apical margin of all the segments white... 34. ? cuiiciiiniis«. 



Abdomen black, segments 2, 3 and sometimes base of 4 more or less ferruginous. 



Scutelluni black; posterior legs entirely black; abdominal segments two and 



three entirely pale ferruginous 16. magnus. 



Scutellum pale. 



Posterior legs honey-yellow, coxae black; abdominal segments 2 and 3, 



sometimes only 3 at base, ferruginous 18. qticbeceiisis. 



Posterior legs black, coxae, tibiae and tarsi varied with white. ..20. electus. 

 Abdomen ferruginous, basal segment only sometimes black. 



Scutellum black 26. rraternus. 



Scutellum pale yellow or white 27. uubivagus. 



All the species of this subgenus, given below, were originally de- 

 scribed as belonging to Ichneumon proper, except Nos. 3, 5 and 35. 



1. excultus, Cress. Trans. Am. Ent. Soc. i, p. 293, 9 . 



Hah. — Can., N. H., Mass., N. J. A deep black, shining, immacu- 

 late species, with apex of abdomen smooth and polished, the wings 

 pale fuliginous, and the antennae with broad white annulus. Length 

 9 .55 — .60 inch. 



2. montanus, Cress. Proc. Ent. Soc. Phil, iii, p. 141, S 9 . 

 IIub.—R. B. T., Can., Mass., Va., Col., Cal. A dark steel-blue, 



immaculate species, with dusky wings; the antennae of 9 have a 

 broad white annulus, while in the % they are entirely black. The 

 blue color of the $ is much brighter than in the % which is opaque. 

 Length % 9 .50— .60 inch. 



Out of eleven % specimens, nine have the longitudinal ventral fold 

 entire on segments two, three and four; the other two specimens have 

 it only on two and three. 



3. tetricus, Prov. Nat. Can. ix, p. 10, 9 . 



Hub. — Canada. A robust deep black species, with annulus on 

 antennae, scutellum and apex of two or three apical segments, white; 

 •wings fuscous. Length 9 .55 — .62 inch. 



