PLATE XXVII. 



P"'lG. 1. — Lateral aspect of prothorax and mesothorax, diagrammatic: 

 pn, pronotum; es 1, proepisternum; es i, px'oepimeron ; pstr, pro- 

 sternum; pcox, procoxa; up, spiracle; dnr, dorsulum; m?», mesonotum; 

 scu, scutellum; artep, articulatory epidemes; bp, base of primary; 

 ew 2, mesoepimeron ; es 2, mesoepisternum; mstr, mesosternum; end, 

 portion of endoskeleton. 



Fig. 2. — Caudal aspect of mesothorax, diagrammatic : • ter, tergum ; 

 str, mesosternum; phr, phragma; apoph, apophyse; c, canal; apod, 

 apodeme; es '2, mesoepisternum; em 2, mesoepimeron; end, portion of 

 endoskeleton corresponding to end in fig. 1, plate XXVII. 



Fig. ."J. — Sclerites forming tergum of thorax: A. pn, pronotum of pro- 

 thorax; dor, dorsulum of mesothorax; mm, mesonotum of mesothorax; 

 scu, scutellum of mesothorax; mett, metathorax. B. median, longi- 

 tudinal section through tergum. 



Fig. 4. — Chitinized process holding labium to thorax (cephalic aspect) : 

 A. a, lateral arm of process; h, yoke-like piece connecting lateral 

 arms, caudad and dorsad of labium. B, tip of a lateral arm. 



Fig. 5. — Ventral aspect of metathorax, diagrammatic: sir, meta- 

 stei'num; cox, coxa; em 3, metaepimeron ; mer, meracanthus; troc, 

 trochanter; mf, ventral edge of metafurca. 



Fig. 6. — Venation of adult of P. celtidis-iimnnnx, fore wing: r, costa; 

 Sc + R, subcostal plus radius; s, stigma; Sc, subcosta; R, radius; 

 M 1 2, media; M 3 If, media; Cu 1, cubitus; Cv, 2, cubitus; af, anal 

 fold or "claval suture"; cl, clavus; A, anal vein; Pr, petiolus cubite. 



Fig. 7. — Venation of adult of P. celtidis-mammse, hind wing. 

 Fig. 8. — Ventral aspect of subgenital plate of female: h, base of plate; 

 a, apex of plate; sli, sensory hairs. 



