Plate IX. 
A. — Mindarus abietinus, wings. 
B. — Mindarus abietinus, fore wing showing tracheae, 
C. — Mindarus abietinus, cauda of alate form. 
D. — Mindarus abietinus, antenna of alate form. 
E. — Mindarus abietinus, abdomen of pupa. 
F. — Mindarus abietinus, cornicle of alate form. 
G. — Colopha ulmicola, antenna of alate form. 
B..— Colopha ulmicola, antenna of stem mother. 
I. — Colopha ulmicola, wings. 
J. — Colopha ulmicola, apterous form. 
K. — Colopha ulmicola, antenna of apterous form. 
L. — Colopha ulmicola, antenna of apterous form. 
M. — Eriosoma lanigerum, apterous form. 
N. — Eriosoma lanigerum, wax plate. 
0. — Eriosoma lanigerum, wax reservoir. 
P. — Eriosoma lanigerum, fore wing. 
Q. — Eriosoma lanigerum, wing pad showing tracheae. 
R. — Eriosoma lanigerum, cornicle. 
S. — Eriosoma lanigerum, antenna of 'alate form. 
T.— Eriosoma lanigerum, oviparous female, showing egg. 
U. — Georgia ulmi, antenna of alate form. 
V. — Georgia ulmi, wings. 
W. — Georgia ulmi, distal segment of antenna of alate form. 
X. — Georgia ulmi, cornicle of alate form. 
Y. — Georgia ulmi, cauda and anal plate of alate form. 
Z. — Georgia ulmi, head of alate form. 
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