The Scottish Naturalist. 305 



2 or 3 mm. across; other characters as given under 18. A. 

 collaris. 



20. Globular when mature, brown, firm, about 12 to 25 mm. 



diameter, not falling off when dry, very thick walled ; 



autumn. Cynips Kollari. 



As broad as long, globular or slightly pointed, pea-sized, fleshy, 



red or yellowish, bare ; May and June. Trigo?iaspis 



\i?iegaptera. 

 Longer than broad, ovate or oval, not over 4 mm. long, 21. 



21. About 4 mm. long, broader above, yellowish green or reddish, 



with minute white dots, bare ; May. Dryoplianta (verru- 

 cosa) divisa. 

 About 3 mm. long, ovate, rounded above, violet, covered 

 with short, velvety, whitish hairs; June. D. (Taschenbergii) 



[folii. 

 About 2 mm. long, ovate, pointed above, dull greenish, covered 

 with rather long white hairs ; May and June. {D. similis) 



\longiventris. 

 Very small, 1 or 2 mm. long, oval, very thin, green, then 

 brown ; June. Andricus (gemmatus) certicis. 



22. On the lower surface, not showing at all above ; autumn, 23. 

 Showing on both surfaces through the lamin?e ; May and 



June. 29. 



Swellings of petiole, mid-rib, or larger veins ; June, July, or 



August. 31. 



On margins of leaf, 32. 



23. Attached to mid-rib or chief veins, often solitary, 24. 

 Attached to leaf surface between larger veins, gregarious, 27. 



24. Situated between two brown scales, which remain on vein after 



gall has fallen ; oval, about 2 mm. long, pale green or yellow, 

 with small red spots, smooth, brittle. Andricus osireus. 

 Not situated between membraneous scales, 25. 



25. Globular, 8 to 12 mm. diameter, yellowish-green or red on one 



side, soft and fleshy when fresh, thick walled. Dryopha7ita 



[folii. 



Depressed spheres, hard and woody, from 4 to 7 mm. diame- 

 ter, 26. 



Kidney-shaped, 1 or 2 mm. long, pale green or yellowish, 

 crowded. Trigonaspis (renum) megaptera. 



26. 5 to 9 mm. diameter, pale yellow, with red side or red belts, 



u 



