PLATE XXXII. 



Fig. 1, — Frons and mouth parts, labium excepted, removed from head. 



(Photo.) 

 Figs. 2, 3 and 4.— Wings of male. (Photos.) 

 Figs. 5, 6 and 7. — Wings of female. (Photos.) 

 Fig. 8. — Tracheation of nymphal wing pad of P. celtidis-gemma, fore 



wing. (Photo.) C, costa; Sc, subcosta; R, radius; M, M, media; 



Cu, Cu, cubitus. 

 Fig. 9. — Tracheation of wing of recently emerged adult of P. celtidis- 



mammte, fore wing. (Photo.) C, costa; Sc + R, radius plus sub- 

 costa; R, radius; M, media; Cu, cubitus. 

 Fig. 10. — Branching of media and cubitus from radius plus subcosta in 



fore wing of recently emerged P. celtidis-mammse : Sc + R, radius 



plus subcosta; M, media; Cu, cubitus. 

 Fig. 11. — Branching of subcosta and radius in fore wing of recently 



emerged P. celtidis-mammse: Sc, subcosta; R, radius; C, costa. 



