DESCRIPTION OF THE PLATES 263 
PLATE X 
FIG. 
1. Chernies strobilobius , larval fundatrices on bud of Picea excelsa. (f.) 
2. Buds of Picea excelsa, with galls caused by Chermes strobilobius. (|.) 
3. Third-year shoot of Larix europaea , as seen at the end of March, 
with larvae and eggs, one larva at base of each bud. (£.) 
4. Larva and eggs, (f.) 
5 - Eggs of exules on leaf of Larix europaea. (f.) 
6. Eggs of sexuparae on ditto, (f.) 
7. Part of shoot of Larix europaea, with colonici, exules, and winged 
sexuparae. (|.) 
8. Exule with pupal skin, (f.) 
9. 10. Winged sexuparae. (f.) 
PLATE XI 
An apple-tree branch, with numerous tumours associated with 
Myzoxylus laniger (=*Schizoneura lanigera). (£.) 
PLATE XII 
1. Galls on leaflets of Fraxinus excelsior, caused by the presence of 
Psyllopsis fraxini, showing at ( a ) early state, ( b ) mature gall, (c) 
appearance of leaflet after departure of the insects. ($.) 
2, 3, 4. Psyllopsis fraxini. (f.) 
5. Leaves of Populus nigra, with galls caused by Pemphigus affinis, 
showing at (d) early, and (e) mature galls. (£.) 
6. Galls on twig of Populus nigra, caused by Pemphigus bursarius (§.) 
7. Pemphigus bursarius , apterous viviparous 9 • ({•) 
8. Ditto, pupa, (f.) 
9. Leaf of Populus nigra, with its petiole galled by Pemphigus spiro- 
thecae, (h) 
10. Pemphigus spirothecae, apterous viviparous $. (f.) 
PLATE XIII 
1. Leaf of A cer psendo-platanus, with galls caused by Eriophyes macrorrhyn 
chus. (£.) 
2. Two galls, (f.) 
3. Section of a gall. (£.) 
4. Aperture of gall of E. macrorrhynchus on lower surface of leaf, (f.) 
5. Unicellular hair from gall of E. macrorrhynchus. (\ 0 -.) 
6 . Eriophyes macrorrhynchus. ( a f a -) 
7. Leaf of Acer campestre, with galls caused by Eriophyes macrorrhyn¬ 
chus. (^.) 
8. Galls in various stages of development. (£.) 
9. Section through three galls and midrib of the leaf. (£.) 
10. Aperture (lower surface of leaf) of three galls, (f.) 
11. Leaf of Acer campestre, with two galls caused by Eriophyes macro- 
chelus. [\.) 
12. Gall, (f.) 
13. Section of gall. (|.) 
