CATALOGUE OF BRITISH PLANT-GALLS 145 
Hymen- 
optera 
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the midrib; the roll is usually on one margin only, and 
extends about two-thirds of the length. 
PONTANIA VIMINALIS Hartig 103 
Syn. Nematus nigrolineatus Cameron. 
Cameron, ii., p. 194, pi. 11, fig. 7. Houard, No. 650. 
Buds greatly swollen, remaining closed and withering 
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 the 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 Vollenh., 
N Vollenhoveni Cam., N. salicis-cmereae Cam. 
Cameron, ii., p. 199. Houard, No. 708. 
A large bean-shaped swelling equally developed on both 
surfaces of the leaf, between the midrib and the margin 
towards the base ; yellowish-green 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 vesicaicc Cameron. 
Cameron, ii., p. 183 ; 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. 
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