PLATE XXVI. 



Fig. 1. — Cross section through ovipositor, about midway: A. cmgd, 



cement gland duct; ovid, oviduct; uv, upper valve; Iv, lower valve; 



tg, tongue and groove; spg, subgenital plate. B. Diagram showing 



position of ovipositor relative to plates. 

 Fig. 2. — Sport anal (?) vein of adult: A, anal vein; C, costa; sv, sport 



anal (?) vein. 

 Fig. 3. — Diagram of tracheation of nymphal wing pad of P. celtidis- 



gemma fore wing: C, costa; Sc, subcosta; R, radius; M, media; 



Cu, cubitus; af, anal fold; A, anal vein. 

 Fig. 4. — Diagram of tracheation of wing of recently emerged adult of P. 



celtidis-mammss, fore wing. 

 Fig. 5. — Longitudinal-vertical section through wax glands: A. wg, wax 



glands; n, nucleus; cu, cuticula; sh, sense organs; wgd, wax gland 



ducts; fb, fat body. B. wgo, openings of wax glands, dorsal aspect. 

 Fig. 6.— Tip of mandible. 

 Fig. 7. — Tip of maxilla. 

 Fig. 8. — Base of mandible : te, tendon. 

 Fig. 9. — Base of maxilla. 



