PLATE IV. 



A. — Amphorophora rubi, head of apterous form. 



B. — Amphorophora rubi, cornicle. 



C. — Amphorophora rubi, cauda. 



D. — Rhopalosiphoninus latysiphon, head of alate form. 



E. — Rhopalosiphoninus latysiphon, cornicle of alate form. 



F. — Rhopalosiphoninus latysiphon, cauda of alate form. 



G. — Myzocallis coryli, cornicle. 



H. — Myzocallis coryli, cauda and anal plate. 



I. — Callipterus juglandis, cornicle. 



J. — Callipterus juglandis, cauda and anal plate. 



K. — Therioaphis tiliae, cornicle. 



L. — Therioaphis tiliae, cauda and anal plate. 



M. — Monellia caryella, cauda and anal plate. 



N. — Monellia caryella, cornicle. 



O. — Chromaphis juglandicola, cornicle. 



P. — Chromaphis juglandicola, cauda and anal plate. 



Q. — Euceraphis betulae, cauda and anal plate. 



R. — Euceraphis betulae, cornicle. 



S. — Calaphis betulella, cauda and anal plate. 



T. — Calaphis betulella, cornicle. 



U. — Calaphis betulella, fore wing. 



V .—Saltusaphis scirpus, head of apterous form. 



W. — Saltusaphis scirpus, cauda and anal plate. 



X. — Thripsaphis balli, head of apterous form. 



Y. — Neothomasia populicola, cornicle. 



Z. — Neothomasia populicola, cauda and anal plate. 



AA.—Periphyllus negundinis, cauda and anal plate. 



BB. — Periphyllus negundinis, cornicle. 



CC. — Chaitophorus populi, cauda and anal plate. 



DD. — Symydobius oblongus, cornicle. 



EE. — Symydobius oblongus, cauda and anal plat' 



FF. — Phyllaphis fagi, cauda and anal plate. 



GG. — Phyllaphis fagi, cornicle. 



HH. — Tamalea coweni, cornicle. 



II. — Tamalea coweni, cauda and anal plate. 



JJ. — Drepanaphis acerifolii, oviparous abdomen. 



KK. — Drepanaphis acerifolii, cauda and anal plate of alate form. 



LL. — Drepanaphis acerifolii, cornicle. 



MM. — Drepanosiphurn platanoides, cornicle. 



NN. — Melanoxantherium populifoliae, cornicle. 



00. — Melanoxantherium populifoliae, cauda and anal plate. 



PP. — Pterocomma populeus, cornicle. 



141613°— 20— Bull. 826 7 97 



