158 The Scottish Naturalist. 



monothalamous. Each contains one larva of Cccidomyia 

 campanula Miiller. This gall is abundant on the sandhills 

 along the coast north of Aberdeen, and also along the rocky 

 coast south of the Dee. (b) This gall consists of a much en- 

 larged and distorted flower-bud and seed capsule. Either 

 the flower is distorted or never shows itself, the bud being 

 early affected. Colour green; surface smooth and fleshy. 

 Internally contains one or two cavities ; in each there is 

 one larva of a beetle (Gymnetron campanula). It is very 

 abundant along the coast south from Aberdeen, and also 

 locally several miles inland. 



Vaccinium Vitis-Id/ea L. — Galls in terminal shoots. They 

 consist of reddish fleshy leaves overlapping so as to leave 

 a central cavity, in which is a dipterous larva. On Morroine 

 Hill, in Braemar. 



Fraxinus excelsior L. — The galls occur along the midribs 

 of the leaflets ; they are long and comparatively narrow, and 

 project along the midrib, below; they are open above, but 

 the edges keep close together when fresh ; they are thus 

 very inconspicuous, especially above. Surface downy below; 

 colour like the leaf. Each is mono- or polythalamous ac- 

 cording to its length; and each cell contains one orange 

 dipterous larva. Local ; but abundant at Banchory, on a 

 few trees. 



Veronica chaivledrys L. — The gall is terminal, seemingly an 

 abortive leaf-shoot. It is ovate, about J^inch diam., and 

 attached by the broad end ; externally it is^ reddish, and 

 covered with grey hairs ; internally it consists of leaflets 

 overlapping, and padded between with woolly substance, 

 among which are several cells, each of which contains one 

 reddish-orange larva of Cecidomyia veronica Brami. Very 

 common. 



Thymus serpyllum L. — Galls terminal, woolly, consisting of the 

 undeveloped leaves and flower-heads. The whole plant 

 assumes a woolly appearance, which is very conspicuous. 

 Larva? reddish. Galls very common. 



Mercurialis perennis L. — Gall (?) on under side of leaf. It 



