AXDEICUS PILOSUS. 67 



Andricus nudus, Adler. 

 (Plate XIII, div. A.) 



Andricfis Malpigliii, Cameron; A. nudus, Mosley. 



English name of gall. — " The Bald Seed Gall. " 



Position of gall. — Ou the flower-stalk of stamiuate catkin. 



Manner of growth. — Sessile, glabrous, glossy, gregarious, 

 pointed. 



Colours. — Pale green, yellowish- green, yellow, brown. 



Average dimensions of a mature specimen. — Length, 

 1'5 mm. : breadth. 1 mm. ; girth, 3 mm. 



May be sought during the months of May and June. 



Growth is complete by the end of May. 



The typical condition of the gall is unilocular and unilarval. 



The larva pupates in the gall. The imago emerges during 

 June. 



Alternate agamic generation : ApMlothrix Malpighii, Adler. 



This gall is found usually on the high branches of 

 large trees. It is very small and inconspicuous, and 

 but for its gregarious manner of growth would rarel)' 

 l^e noticed. It is ovoid in shape, with a minute nipple- 

 like process on the apex, upon which there may be a 

 very few small hairs ; otherwise it is perfectly glabrous. 

 Seven appears to ])e the usual numl^er of galls in a 

 cluster, and seldom more than two clusters on the 

 same catkin stalk. 



It was first discovered and described by Dr. Hermann 

 Adler during his investigations in 1876-8. I have 

 found it plentiful on Quercus sessiliflora at Hastings. 



Andricus pilosus, Adler. 

 (Plate XIII, div. B.) 



Andricus pUosus, Licht., Mayr, Cameron, Mosley. 

 English name of gall.— " The Hairy Catkin Grail." 

 Position of gall. — On the flower-stalk of staminate catkin. 

 Manner of growth. — Sessile, pilose, solitary (usually), ovoid, 

 pointed. 



Colours. — Pale green, green, pale brown, dark brown. 



