142 
BRITISH GALLS 
Hymen- 
optera 
Diptera 
Hymen- 
optera 
Coleop- 
tera 
Diptera 
ing a whitish larva. Larger plurilocular galls attaining 
the size of a walnut often result from fusion of adjacent 
ones. Larval cavities in the pith. M. G. Imago appear¬ 
ing in June. 
Cryptocampus medullarius Hartig 86 
Syn. Euurapentandrae Cameron. 
Cameron, ii., p. 2r 1, pi. ir, fig. 1. Connold, Plant Galls, 
fig. 313. Houard, No. 568. 
Leaf margin rolled towards the lower surface usually 
for its entire length ; occasionally both margins are simul¬ 
taneously loosely rolled. 
PONTANIA LEUCOSTICTA Hartig 8 7 
Syn. Nematus leucostictus Hartig, Ne?natus crassulus 
Thoms. 
Cameron, ii., p. 189. Houard, No. 570. 
Salix triandra Linn. 66. Almond-leaved Willow. 
Male catkins deformed. The filaments of the stamens 
and the scales are thickened and covered with a white 
woolly pilosity. Occasionally the terminal leaves are 
bunched into a rosette through the arrested development 
of the internodes between them, and are covered with a 
similar pubescence. Larvae gregarious, orange coloured. 
M. G. 
Rhabdophaga heterobia H. Low 88 
Syn. Cecidomyia heterobia H. Low. 89 
Connold, Plant Galls, fig. 229. Houard, No. 654, 656. 
Salix fragilis Linn. aggr. 90. Crack Willow or Withy. 
Elongated or reniform swelling, resembling a small 
bean, showing almost equally on both surfaces of the leaf, 
10 mm. by 5 mm. maximum size, appearing in June. Sur¬ 
face corrugated, green at first, then more or less tinted with 
red. Solitary or gregarious, unilocular, never seated on 
the midrib. Each gall contains a single larva, green on 
the back, lighter underneath, with a brown head. Pupa 
white. M. G. or M. E. (Plate II. 1.) 
PONTANIA PROXIMA Lepel 90 
Syn. Nematus gallicola Ste., Nem. Valisnierii Htg. 
Cameron, ii., p. 203, i., pi. 3, fig. 8. Connold, Veg. 
Galls, pi. iii; Plant Galls, fig. 315. Houard, No. 595. 
Fusiform or rounded swellings on the smaller branches, 
with a cavity in the pith containing a large yellowish-white 
larva. M. G. 
Saperda populnea Linn. 91 
Houard, No. 588. 
Terminal leaves brought together by the arrested 
development of the internodes, remaining erect and rolled 
