1913] Pemphigince. Attacking Populus In Colorado. 493 



Sexuales. 



Pale green or yellowish green in color, the males being much the 

 smaller and darker; mouth parts lacking. 



We have taken this species as follows : 



Monte Vista 6-22-13 



La Jara 6-23-13 



Ft. Collins 7-10-12 



Laramie, Wyoming 7-15-13 



Wood's Landing, Wyo. 7-15-13 



Populus angustifolius C. P. G. Fundatrix 



C. B. 

 P. G. 



All stages 



EXPLANATION OF PLATE. 



tonwood. 



Figures 11 to 18, Cornaphis populi: 



Fig. 11. Young, and Fig. 12, a rather mature gall of this species. 



Fig. 13. fundatrix. 



Fig. 14. Fundatrigenia. 



Figs. 15, 16 and 17, antenna of Fimdatrix, fundatrigenia, and sexupara 

 respectively. 



Fig. 18. Wings of sexupara. 



The enlargements are indicated with each figure. 

 Caroline M. Preston. 



Figures are drawn by Miss 



Correction: Page 486, for Plate I read Plato LIX. 



