1917] Girault—North American Species of Pachyneuron 89 
lateral carina. Mandibles 4=dentate. Clypeal pro- 
jection with a tooth on each side of its base. 
Abdominal petiole over twice longer than wide, scaly. 
Neck of propodeum conspicuous; clypeus with its 
projection with a concave distal margin. Coxe 
and femora submetallic. Scape yellow. Median 
carina of propadeum obsolete... . . altiscuta Howard 
Abdominal petiole only a little longer than wide. 
Clypeal projection truncate or subtruncate. 
Cox metallic, femora washed with metallic. 
Scape pale. 
Propodeum with a more or less complete (paired 
and diverging) median carina which is somewhat 
like a ruga and rather delicate, variable. Funicle 
joints all short, somewhat variable. Abdominal 
petiole scaly. (=allograpte Ashm.) 
anthomyie Howard 
The same. Propodeum with single median and 
lateral carine, the latter more or less obscure and 
paired at base; petiole with strong longitudinal 
strie. Scutellum with a distinct  cross-suture 
before apex. Segment 2 of abdomen caudad at 
meson faintly emarginate....hammari Crawford 
The same but scutellum without a distinct cross- 
suture before apex (only a faint obscure ridge in its 
place as in other species), segment 2 of abdomen is 
sharply minutely incised caudad at meson (as in 
the other species), the spiracular sulcus is twice 
broader while the median and lateral carine of the 
propodeum are more delicate 
virginicum sp. nov. 
Scape with the distal half metallic. 
The same as hammari but the cross-suture of the 
scutellum is indicated by coarser punctures, distad 
of its site, the caudal margin of segment 2 of the 
abdomen is convex, entire, the median carina of 
the propodeum is represented by several interlac- 
ing, delicate rugee broadly across the meson while 
