DESCRIPTION OF THE PLATES 265 



PIG. 



4. Radical leaf of Centaurea Scabiosa, with galls (early state) caused by 



Eriophyei centaunae. (^.) 



5. Leaves of Vibuynmn Lantana, galled by Eriophyes viburui. (i.) 



6. Gall of E. viburni. (f ) 



7. Ditto, showing aperture on under surface of leaf, (f .) 



8. Ditto, section. (^.) 



9. Shoot of Taxus baccata, with bud galled by Eriophyes psilaspis. (J.) 

 10. Bud of Taxus baccata, galled by Eriophyes psilaspsis. (|.) 



PLATE XXII 



1. Bud of Quentis pedunculata, galled by the larva of Dryophanta 



similis. [\.) 



2. Ditto, (f.) 



3. Leaf of Q. pedunculata, with galls caused by the presence of the 



larvae of Dryophanta longiventris, the alternate generation of th6 

 preceding. (|.) 



4. Section of gall, with D. longiventris that has just emerged from its 



cell, a.) 



5. Buds, with galls arising from the presence of the larvae of D. Taschen- 



bergi. (^.) 



6. Leaf, with cherry-like galls caused by the presence of the larvae of 



Dryophanta folii. (J.) 



7. Withered leaf, with gall of D. folii. (|.) 



8. Dryophanta folii. (|.) 



9. Spring leaves of Q. pedunculata, with gall on leaf and one on petiole, 



caused by the presence of the larvae of Dryophanta verrucosa (after 

 Adler). (1.) 



10. Ditto, on leaf (after Adler). (?.) 



11. Ditto, in a bud (after Adler). (f ) 



12. Galls caused by the presence of the larvae of Dryophanta divisa, the 



agamous generation of the preceding. (^.) 



PLATE XXIII 



Leaves of Ulmus montana, galled by Oligotrophus Leemei — (a) distorted 

 yonng leaves, with galls on the midrib ; (b) upper surface of leaf, 

 showing apertures of galls ; (c) M two leaves, showing the under 

 surface with, numerous galls on the midrib, (f .) 



PLATE XXIV 



Papaver duhium, showing two normal capsules, and one galled by 

 the presence of the larvae of A ulax papaveris, causing it to become 

 swollen and to droop. (^ ) 



PLATE XXV 



A branch of Prunus insititia, bearing four normal fruits, and three 

 that are greatly hjrpertrophied through the presence of the 

 iunguz Exoascus pruni. {}.) 



