142 



BRITISH GALLS 



Hymen- 

 optera 



Diptera 



Hymeu- 

 optera 



Coleop- 

 tera 



Diptera 



ing a whitish larva. Larger plurilocular galls attaining 

 th6 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. Euura pentandrae Cameron. 



Camersn, ii., p. 211, pi, 11, fig. i. 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 87 



Syn. Nematus hucostictus Hartig, Nematus crassulus 

 Thoms. 

 Cameron, ii., p. 189. Houard, No. 570. 



Saliz triandra Linh. 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 intemodes 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. 

 J Elongated or rjsniform 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. i.) 



PONTANIA PROXIMA Lepel 90 



Syn. Nematus gallicola Ste., Nem. Valisnierii Htg. 

 Cameron, ii., p. 203, i., pi. 3, fig. 8. Connold, Veg. 

 Galls, pi. Ill ; 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 intemodes, remaining erect and rolled 



