Patton.] . on. 382 [January 21, 
and in its other characters this species agrees generically with 
I. philadelphica. 
SpHEex Linn. 
(S. ichneumonia, S. pennsylvanica and S. flavipes.) 
Clypeus of the female crenate on the margin, or with short, broad — 
teeth; clypeus of the male truncate, the margin crenulate. Labrum 
of the female with a median carina, the margin finely pubescent, not 
armed with teeth. Mandibles of the female curved and ending in a 
long pointed tooth; armed with a large subtriangular tooth within, 
and this tooth armed at its proximal base with a minute sharp tooth. 
Mandibles of the male with only one tooth on the inner margin. 
Marginal cell extending beyond the third submarginal. Claws of 
the tarsi armed with two teeth at the base beneath, the outer teoth 
the smaller; only two bristles between the claws. Anterior tarsi 
of ¢ ciliated externally with long bristles. Petiole of the abdo- 
men no longer than the posterior coxae; abdomen convex, the tip 
pointed in the female. 
Gastrosphaeria Costa, differing from Sphex in its ‘‘conico- 
globoso”” abdomen and “ truncato-concave” tip of antennae, appears 
to contain our species; but the characters given are not sufficient to 
establish a distinct genus. 
Sphex ichneumonea Linn. 
Clypeus of the female with two Hone divergent lobes in the 
middle of the anterior margin, and a very slight angle just exter- 
nally to them; clypeus of the male slightly crenulated on the anterior 
margin. Labrum ferruginous; labrum of the female obtusangular 
anteriorly and the median carina forming a point at the apex, the 
median and basal portions of the labrum polished, the lateral and 
anterior margins marked off by a faint line, and a subtriangular me- 
dian area marked off by a similar line; in the male this inner area 
much more distinct, the apex of the labrum obtusangular and 
rounded, there being no median carina. In the male the apical ven- 
tral segments are concave, the fifth, sixth and seventh pubescent, 
with the pubescence at the sides long; the seventh ventral segment 
sharply emarginate. 
Sphex flavipes Smith. 
Clypeus probably as in ichneumonea. Labrum of the female as 
in ichneumonea, but, being black or piceous, the delimitations of 
areas are, as in pennsylvanica, not apparent; in the male the labrum, 
