CATALOGUE OF BRITISH PLANT-GALLS 153 



Populus tremula Linn. 105. Aspen. 



Hymen- Petiole swollen. The eggs are laid on the leaf stalk, 



optera which becomes swollen and bends over on each side to 



cover the eggs. Larvae (July and August) green with 



black head, becoming orange, with twelve large black 



marks. Imago September i. 



Trichiocampus viminalis Fall. 168 

 Syn. Cladius viminalis Fall. 



Theobald, First Rep. Econ. Zool., 1903, p. 37. This 

 insect also occurs on various Willows, but I can find no 

 records of its causing galls thereon. 



Coleop- Fusiform or rounded swellings on young branches. See 



tera No. 161 and Plate VI. 7. 



Saperda populnea Linn. 169 

 Connold, Veg. Galls, pi. 21 ; Plant Galls, fig. 37. Houard, 

 No. 489. 



Lepidop- Petiole with an elongated swelling close to the base of 

 tera the leaf, containing ^ pale yellow larva. (Plate VII. 4.) 



Nepticula argyropeza Zell. 170 

 Syn. N, apicella Ste., of Meyrick's Handbook Brit. 

 Lep., p. 726. 

 Houard, No. 495. 



Shoots swollen, with a cavity containing a single larva. 



Laspeyresia coroLlana Hb. 171 



Syn. Laspeyresia Leegerana Wilk. 



Meyrick, Handbook Brit. Lep., p. 51 1. This insect was 

 found once at Whittlesea Mere many years ago ; perhaps 

 now extinct in Britain. 



Diptera Leaf margins rolled upwards, but not tightly ; yellow-: 

 green, becoming brown. Slightly pilose. M. E. 



Contarinia sp. 172 

 Connold, Plant Galls, fig. 40. Swanton, Knowledge, 

 June, 1910, erroneously recorded as caused by Eriophyes 

 dispar Nalepa. Houard, No. 502. 



Small rounded swellings, about 5 mm. in diameter, on 

 the twig or on the petiole, generally tinted with red, and 

 slightly pubescent. The larval cavity has a conical pro- 

 longation, opening at maturity with a circular lateral orifice. 

 Larva orange. M. E. 173 



Harmandia petioli Kieff. 174 

 Connold, Veg. Galls, pis. 94, 1 17 ; Plant Galls, fig. 39. 

 Houard, Nos. 493, 497. 



,, Rounded pustules (3 to 4 mm. in diameter) on the upper 



surface of the leaf, gregarious or coalescent, usually bright 

 red or purple. The pustule is compressed at its base, and 



