June 5, 1916 



Woolly Pear Aphis 



359 



/r _ ^ 



Fig. 1. — Comparative structure of antennje and wax pores of Eriosoma spp.: A , distal segments of antenna 

 of winged viviparous female of E. pyricola; B, distal segments of antenna of winged viviparous female of 

 E. ulmi; C, distal segments of antenna of wingless viviparous female of E. amcriccnum; D, distal segments 

 of antenna of wingless viviparous female of E. lanigerum; E, distal segments of antenna of wingless vivi- 

 parous female of E. pyricola; F, distal segments of antenna of winged viviparous female of E. americanum: 

 G. distal segments of antenna of winged viviparous female of E. lanigerjirn; H, compound wax pore of E. 

 lanigerum; I, compound wax pore of E. pyricola; J, distal segments of antenna of first instar wingless 

 viviparous female of E. pyricola. 



