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. — TJnilachnus parvus, fore wing. 



F. — ■ TJnilachnus parvus, cornicle of alate form. 



G. — TJnilachnus parvus, head of alate form. 



H. — Tjongistigma 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. 



IT. — 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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