J. 'r. Wads WORTH 160 



Fig. 4. Vertkal section through tlirce galled flower-heads of C. nigra showing the (cham- 

 bers in wliioli the larvae liibernate during winter, and where pupation takes place. 

 The left liand one contains a pupa. x 2. 



Fig. 5. Vertical section tiirougii a galknl llower-head of C. nigra ; the section shows the 

 hard woody walls of two chambers ; the right chamber contains a section of a larva 

 and shows the thick layer of nutritive tissue that is separated from the remainder of 

 the receptacle when the woody layer is developed. The section is slightly tangential, 

 and the larva is younger than the one in Fig 6. x 5. /. section of larva. 



Fig. (5. Section similar to Fig. 5 containing an older larva in the left chaml)er, the nutri- 

 tive layer has been ahnost eaten away by the larva, and the woody wall reached. 

 X 5. I. section of larva. 



PLATE XII. 



Fig. 7. Egg of U. soUtitiulis. 24 hours after oviposition. x 50 ; m. micropyle. 



Fig. 8. Cephalo-pharyngeal skeleton of mature larva from the left side. x 120. m.s. 

 mandibular sclerite ; h.s. hypostomal sclerite ; c.s. cephalo-pharyngeal sclerite with 

 deep indentation between dorsal and ventral processes which exhibit further bifurca- 

 tions ; s.h. sub-hypostomal sclerite ; m.e. membrane surrounding each process of 

 the cephalo-pharyngeal sclerite. 



Fig. 9. Mature larva, ventral aspect. x 10. The larva was slightly lifted upwards 

 anteriorly bringing uito view the mouth-slit and the anterior spiracles, a. anus. 



Fig. 10. Puparium, ventral aspect. x 10. a. anal scar. 



Fig. 11. Anterior view of mature larva. x45. p.b. posterior border of third segment. 

 l.sp. left anterior spiracle, m.s. mouth-slit with the dark chitinised sides of the 

 oral-lobes, m. posterior margin of the chitinised area surrounding the mouth. 



Fig. 12. Posterior view of last segment of mature larva, x 50. l.m. lateral margin 

 of last segment hs.d. horse-shoe shaped depression. fZm.r?. dorso-median depression. 

 l.p. left posterior spiracle, i.m. indications of muscle-attachments which appear as 

 dark areas on the surface. 



Fig. 13. Vertical section of flower-bud of C. nigra showing the passage p. made by ovi- 

 positor during the process of oviposition. x 5. The ovipositor had passed on both 

 sides of the third floret from the left-hand side, as indicated in the drawing. 



Fig. 14. Right posterior sjjiracle of mature larva viewed from above. x 200. /.c. 

 felted-chamber (Filzkammer). 



Fig. 15. Left anterior spiracle of nearly mature larva viewed from above, x 200. 

 f.c. as Fig. 14. 

 Note. In figs. 14 and 15 the felted -chamber (/.c.) is displaced laterally. In the larva 



the chamber is directly beneath the spiracular openings. 



Figs. 7, 8, 11, 12, 14, and 15 were drawn by the aid of the Zeiss-Greil drawing apparatus. 



