The Scottish Naturalist. 303 



In acorns, distorted and stunted. Andricus sp. ? 



4. On main root near ground, brown, roundish hard, one or two 



inches across, many-chambered. Andricus radicis. 



Sunk in groups in bark of main root, conical above, the top 



falling off when old ; autumn and winter. A. corticis. 



In clusters on side roots, soft and red when fresh, brown and 



hard when dry, from one to ten chambers in each ; autumn 



and winter. Biorhiza aptera. 



5. In bark, or in young wood of stems, where wounded, Gall 



like form on roots ; autumn. A. corticis. 



Swellings at wounds in stems, like the gall of this insect on 

 roots ; autumn. A. radicis. 



6. Sunk in substance of twigs, causing gouty swellings ; July. 



A. (iiodidi) radicis, and A. testaceipes, rarely. 

 On young branches covered with earth or vegetation, galls 

 crowded, but distinct, conical, hard, woody, furrowed and 

 brown when old, but fleshy and reddish when young. A. 



[ {Sieboldii) testaceipes. 



7. On very small buds on trunks, almost seeming to be stem- 



galls, 8. 



In lateral or terminal buds on twigs, 9. 



8. Globular, pea-sized, fleshy, red or yellowish, among moss near 



base of stem ; May and June. Trigonaspis megaptera. 



Oblong, about 2 mm. long, greenish, but covered with rather 



long white hairs ; May and Jun. Dryophanta (similis) 



[longiventris. 

 Oblong, rounded at tip, 2 or 3 mm. long, violet, with short 



velvety white hairs; in adventitious buds near base of 



trunk ; June. D. ( Taschenbergii) folii. 



9. Many-chambered, large, often over 1 in. across, yellowish or 



reddish, spongy and soft when fresh, terminal ; May and 

 June. Biorhiza {terminalis) aptera. 



One-chambered (rarely with two or three inner galls), 10. 

 ic. Small brown inner gall, lies in the large chamber of, and 

 separate from outer, except at one point, n. 



Yellow globular inner gall nearly fills cavity of brown, rather 

 hairy, outer gall, which is size of a pea, on buds ; autumn. 



Andricus Clementina:. 

 No separable inner gall, 12. 



1 1 . Terminal swellings of twigs, central cavity covered above with 



