BRITISH GALL-INSECTS. 19 



lings 0? Populiis treniula. A rounded or oblong swelling 

 of the twig is the result, in which swelling the insect passes 

 its metamorphosis. 



APHID^. 



82. Pemphigus hursarias, L. 



In the twisted and incrassated leaf-stalks of several 

 poplars. 



S3. Schizoneura lanuginosa^ Hartig. 



In the large galls of the size of a ^valnut or bigger, con- 

 sisting of a modified bud or wdiole leaf on Ulmus caiivpestris 

 and suherosa. 



84. Tetraneura ulmi, L. 



In pedunculated, fig-shaped, upright galls attached by their 

 thin end to the upper side of the leaves of Vlinus campestris 

 and suherosa. 



For a summary of observations on the preceding two 

 species the reader may consult Mr. R. M'Lachlan's paper 

 in the Ent. M. Mag. iii. p. 157. The same volume contains, 

 at p. 190, an interesting memorandum by Mr. M. C. Cooke 

 on the contents of such galls. Some remarks of ray own on 

 the same subject may be found in the Zoologist, May, 1868, 

 p. 1203. 



85. Phylloxera vasfatrix, Planchon. 



In knotty galls on the roots and open tubercles on the 

 leaves' of Vitis vimfera. The dread pest of the vineyards 

 abroad and of the vines grown under glass in Britain. 

 Numerous scattered notes on this species have been published 

 by Prof. Westwood and other gentlemen in the Proc. Ent. 

 Soc. Lond,, and different issues of the Gardener's Chronicle. 



c2 



