PLATE II. 
A. — Dilachnus ponderosae, fore wing. 
B. — Dilachnus ponderosae, cornicle of apterous form. 
C. — Dilachnus ponderosae, head of alate form. 
D. — Schizolachnus tomentosus, fore wing. 
E. — Unilachnus parvus, fore wing. 
F. — Unilachnus parvus, cornicle of alate form. 
G. — Unilachnus parvus, head of alate form. 
H. — Longistigma caryae, wings. 
I. — Longistigma caryae, apterous form. 
J. — Longistigma caryae, cornicle. 
K. — Longistigma caryae, cornicle. 
L. — Longistigma caryae, antenna of alate form. 
M. — Stomaphis quercus, alate form. 
N. — Stomaphis quercus, head of alate form. 
0. — Stomaphis quercus, cornicle of alate form. 
P. — Stomaphis quercus, antenna of alate form. 
Q. — Stomaphis quercus, cauda and anal plate. 
R. — Stomaphis quercus, pits on rostrum. 
S. — Pterochlorus roboris, wing. 
T. — Pterochlorus roboris, head of alate form. 
U. — Pterochlorus roboris, cornicle of alate form. 
V. — Pterochlorus viminalis, wings. 
W. — Pterochlorus viminalis, abdomen of alate form. 
X. — Pterochlorus viminalis, head of alate form. 
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