CATALOGUE OF BRITISH PLANT-GALLS 145 



the midrib ; the roll is usually on one margin only, and 

 extends about two-thirds of the length. 



PONTANIA VIMINALIS Hartig I03 



Syn. Neuiatus nigrolirieatus Cameron. 



Cameron, ii., p. 194, pi. 11, fig. 7. Houard, No. 650. 



Hymen- Buds greatly swollen, remaining closed and withering 

 optera away. Each contains a single larva. 



Cryptocampus ater Jurine 104 

 Syn. Cryptocampus angustus Hartig, Euura nigritarsis 

 Cameron. 



Inchbald, 1864, p. 47. Houard, No; 646. 



Salix purpurea Linn. 76. Purple Osier. 



Oval or long and narrow pustule on die upper surface 

 of the leaf, parallel to but not touching the midrib, reddish 

 or purple above, yellowish-green below. Sometimes there 

 is a second pustule on the other half of the blade. Larva 

 yellowish, with brown head and blackish eyes. 



Pontania femoralis Cameron 105 



Syn. Nematus femoralis Cam., N. ischnocerus Zadd. 



Cameron, ii., p. 196 ; i., pi. 5, figs. 5, 10. Houard, 

 No. 706. 



A spherical swelling (7 to 12 mm. in diameter) on the 

 lower surface of the leaf, to which it is attached by a 

 point ; glabrous, green, yellow, or red. It appears on the 

 upper side of the leaf merely as a rounded reddish spot. 

 The gall is reduced to a thin shell before the larva quits 

 it. M. E. (Plate II. 9.) 



Pontania salicis Christ 106 



Syn. Nematus gallarum Hartig, N.viminalis VoUenh., 

 N. Vollenhoveni Cam., N. salicis-cinereae Cam. 



Cameron, ii., p. 199. Houard, No. 708. 



A large bean-shaped sweUihg equally developed on both 

 surfaces of the leaf, between the midrib and the margin 

 towards the base ; yellowish-g^een or brownish-red, thin 

 walled, with a spacious cavity containing a single large 

 yellowish-green larva (15 mm. long) with reddish ex- 

 tremities, and black spots above its feet. M. E. 



Pontania vesicator Bremi 107 



Syn. Nematus vesicaiet Cameron. 



Cameron, ii., p. 183 s i-, pi. 5) fig. 8. 



Leaf margin rolled inwards. See No. 103. 



Pontania viminalis Hartig 108 

 Cameron, ii„ p. 194. Houard, No. 701. 



Leaf stalk swollen (diameter 3 mm.) ; the swelling 

 often extends the entire length and involves the midrib. 



