APPENDIX II. 



SYNOPTICAL TABLE OF OAK GALLS. 



L On the Leaf. 



A. On the under surface of the leaf. 



{a) Currant-like, green often tinged with crimson, less 

 than 6 mm. in diameter, in May and June. 

 Smooth and glabrous, 5-6 mm. 



I*. Spathegaster baccarum. 



Pale, 4mm., covered with erect white hairs falHng 



off at maturity. 4*. Spathegaster tricolor. 



(b) Cherry-like, 1-2 cm., July — Oct. 



14. Dryophanta scutellaris. 



5-7 mm., red with white stripes, skin rough and 



nodular. 15. Dryophanta longiventris. 



(c) Like buckshot, broader than high, smooth, shining, 



red becoming brown, July — October. 



16. Dryophanta divisa. 



(d) Ovoid, smooth, greenish, then brown with red 



spots, on vein, between two brown scales, Aug. 



and Sept., 2-3 mm. 19. Neuroterus ostreus. 



{e) Kidney-shaped, 1-2 mm., green, crowded on veins, 



in September and October. 18. Biorhiza renum. 

 (/) Flat, circular, lenticular, often irregular. 



Sunk in the leaf-substance, green, radiate striation, 



Ma}^ and June. 3^. Spathegaster vesicatrix. 



