228 CRABRONIDE. 
above, sometimes the margin of the last two or three segments 
piceous, the last segment slightly produced at its apex ¢. 
The ¢ differs in having the antennz beneath fulvous, as long 
as the head and thorax, and proportionably thinner ; the meta- 
thorax very rugose, and the petiole of the abdomen as long as 
the remainder of the first segment. 
t4+ The Sphex pallipes of Panzer, both figure and de- 
scription, are certainly this insect; and Van der Linden 
is wrong in referring it to his Pemphredon tristis, for the 
petiole will not admit of its being that or any other species 
of the genus Diodontus of Curtis ; nor can it be a petiolated 
Pemphredon, which would place it with my Cemoni or 
Pemphredones, for the form of the head is so totally 
different ; and Sturm was more likely to err in the neu- 
ration of the wings prior to its introduction as a character, 
than he was in the general habit, and his figure exactly 
resembles the 9 of the present species. 
Genus XXXIII.—Mimesa. Shuck. 
Heap transverse, a little wider than the thorax ; face covered 
with a silvery down; eyes oval, lateral ; stemmata placed in 
a triangle on the vertex ; antenne inserted about the middle 
of the face, clavate, rather longer in the ¢, and less clavate ; 
the clypeus transverse, rounded in front, convex, with a small 
transverse elevation just within its anterior margin, which is 
very slightly emarginate ; labrum concealed; mandibles bi- 
dentate, the inner tooth considerably the smallest, the ex- 
terior one obtuse. ‘The THorax subrotund; the collar trans- 
verse, linear ; scutellum transverse, subquadrate ; the meta- 
thorax short, gibbous; the superior wings with one lanceolate 
submarginal cell and three submarginal cells, the second the 
smallest, narrowed towards the marginal, and receiving both 
recurrent nervures, the third distant from the apex of the ning, 
