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-mammse, fore wing. 

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



glands; 7i, nucleus; cu, cuticula; sh, sense organs; tvgd, 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. 



