160 FOREST ENTOMOLOGY. 



I. On the Leaf. 



A. On the under surface of the leaf. 



Currant gall found either singly or in groups green or tinged 

 with red soft, succulent, smooth, about 5 mm. diameter. In 

 May and June ; soon shrivels up after escape of fly 



Spathegaster bacea rum. 



Pale, about 4 mm. diameter, soft, in clusters and hairy. July 



Spathegaster tricolor. 



Cherry-like gall, softish, generally singly but sometimes in clusters. 

 July and October .... Dryophanta Scutellaria. 



Smaller than previous species ; harder, and beautifully marked 

 with reddish stripes. July to October . Dryophanta longiventris. 



Like a small pellet, smooth, beautifully spotted. August to Oct- 

 ober ....... Neuroterus ostreus. 



Kidney-shaped, often in clusters on veins. September and October 



Biorhiza renum. 



Uutton-like gall, conspicuously depressed in centre, surface like silk 

 velvet, light-brown colour. Autumn . Neuroterus numismatis. 



Covered with stellate hairs, raised in centre, flat at outer edge, 

 spangle gall. Late summer and autumn . Neuroterus lenticularis. 



Not covered with hairs, nearly smooth, white or yellowish, outer 

 edge turned up. Late summer and autumn Neuroterus Ictviusculus. 



Centre of gall concave, edges conspicuously turned up 



Neuroterus fumipennis. 



B. On the margin of the leaf 



(1) No inner gall. 



Smooth, spindle shaped, causing fairly deep indentations of leaf 



Neuroterus albipes. 



Smooth, red-ribbed, and leaf on which it is found often looking as 



if abruptly cut ..... Aphilothrix marginalis. 



(2) With an inner gall. 



An irregular globular swelling, outer surface hard, lightish-yellow 

 colour. ....... Andricus curvator. 



