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. 

 H. — 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, 

 O. — 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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