8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



sal sulci; the hind femur with an elongate oval patch of short pale 

 hairs near apex on the posterior surface (pi. 1, fig, 4) ; both recurrent 

 veins received by the second submarginal cell; abdomen of male 

 without fasciculate hairs at apices of any of the sternites; and the 

 pronotum in the males frequently with a sharp angle or tooth on each 

 side above. 



Subgenotype, Psen kohlii Fox. 



Fox, in his paper on Psen,^ divided the genus into several groups 

 more or less in accord with the present arrangement, this segregate 

 being referred to as " Group kohlii^ There are, however, a few 

 characters used in this paper which he did not utilize in his, and he 

 was uncertain apparently as to the application of the character of 

 the tridentate clypeus in both the sexes, while he included fuscipes 

 Packard here, which is not in accord with my present findings. 



Following is presented a key to the species known to me from 

 North America. 



KEY TO THE SPECIES OF SUBGENUS PSENEO 



1. Males 2 



Females 6 



2. Antennal flagellum with a minute pimplelike elevation on each segment from 



2 to 9, inclusive, sometimes more elongate on first three segments 3 



Antennal flagellum with a much larger elongate glossy elevation on one 

 side of most of the segments, which makes it appear somewhat monili- 

 form 4 



3. Abdominal petiole black ; pronotum spicate on each side. 



spicatus, new species 

 Abdominal petiole red ; pronotum not spicate on each side. 



angulatus, new species 



4. Tibiae and tarsi bright fulvous-yellow, very much paler than the glossy 



black femora ; petiole of abdomen chestnut-red, darker on dorsum ; second 



segment of the antennal flagellum without any raised line kohlii Fox 



Tibiae always partly or entirely darkened, fuscous, or dark brown, and 

 not very conspiciously paler than the black femora, the tarsi sometimes 

 largely fuscous ; petiole of abdomen black, rarely reddish below and on 

 sides 5 



5. Second segment of antennal flagellum without any raised line evident ; tarsi 



normally bright fulvous and conspicuously paler than tibiae. 



simplicicornis Fox 



Second segment of antennal flagellum with a small but distinct raised line ; 



tarsi dark brown, not noticeably paler than tibiae punctatus Fox 



6. Scutellum coarsely longitudinally striato-punctate ; petiole of abdomen usu- 



ally red 7 



Scutellum merely punctate, not striate on any part of disk 8 



7. Legs entirely fulvous-yellow ; pronotal lobes also of that color ; coxae black- 



ened at bases fulvipes, new species 



Coxae, trochanters, and femora largely black, tibiae usually darkened in 

 part; pronotal lobes black kohlii Fox 



1 Trans. Amer. Ent. Soc, vol. 25, p. 1, 1898. 



