308 Annals Entomological Society of America [Vol. V, 
with the second apical cell which is open at its outer end, no 
cross vein separating these two being present in the American 
members of this subfamily. Behind this cell is a space extend- 
ing to the hinder margin, the first apical cell. © 
There is a variation in the number of cubital and discoidal 
cells and upon this variation depends the separation of the 
group into genera. There also seems to be a variation in the 
shape of the radial and cubital cells which may be of some 
specific value. The radial cell differs in the different sexes and 
there seems to be an area more or less confined to the costal, 
median, stigmal, first cubital and radial cells which is usually 
covered with hairs. The region beyond the closed cells is very 
finely striate with parallel lines. This fact alone would serve 
to separate this subfamily from two of its nearest allies, the 
Myzinide and Tiphiide if other structures were not available. 
The veins which appear in the front wing of this group are 
the costal, subcostal, externo-medial, anal, basal, first, second 
and third transverse cubital, transverse medial, discoidal, 
cubital, first recurrent and subdiscoidal veins. Their arrange- 
ment and relation to each other are shown by figure. Either 
the presence or absence of a third transverse cubital nervure 
causing either the presence or absence of a third closed cubital 
cell is a generic character as before stated. 
The fact that there is but one recurrent nervure is of sub- 
family value separating the Scoliine from the Campsomerine, 
the other subfamily of this family Scolide. 
Along the central portion of the hinder margin of the anter- 
ior wings just internal to a nearly central notch of this margin 
on the anal cell is a fold known as the frenal fold, in which the 
frenal hooks of the hind wing catch so that the two wings may 
act together. 
There seems to be nothing of systematic importance in the 
structure of the hind wing. About one-third of the distance 
from the base of the wing on the posterior border there is a 
deep narrow sinus and at about the center of the anterior 
border are the frenal hooks spoken of above. Except for a very 
few hairs mostly near the costal border the hind wing is naked. 
TEGULA. The tegula is a small three sided, very convex, 
plate lying over the base of the fore wing, separating it from the: 
dorsal plate of the prothorax in front and from the mesonotum 
above. The surface of the tegula is usually smooth and shining: 
