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 1. 
Trichiocampus viminalis Fall. 168 
Syn. Cladius viminalis Fall. 
Theobald, First Rep. Econ. Zook, 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 a 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. 511. 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, 117 ; 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 
