ANDRICUS AMENTI. 51 



tlie larval cell within it. The lower half contains one 

 or more cells ; there may be as many as five. 



The outer wall rises above this portion and forms an 

 empty cup-shaped space. The rim of this outer 

 growth, when mature, often becomes ragged, shrunk, 

 and twisted, it also curls inwardly, meeting at or near 

 the centre. 



The colour of the gall is a very pale green, or a 

 greenish-yellow, and during the period of formation it 

 is soft and succulent, ultimately it hardens consider- 

 ably. The investing tissue is at first greenish-yellow, 

 often suffused Avith red, which, as growth proceeds, 

 turns reddish-brown, and when mature is hard and 

 woody. 



Andricus amenti, Giraud. 

 (Plate V, div. B.) 



Andricus mnenfi, Mayr, Fitch, Cameron, Mosley. 



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



Position of gall. — On stamiuate catkins of Q. sessiliflora. 



Manner of growth. — Pilose, single, and in clusters. 



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



Average dimensions of a mature specimen. — Length, 

 2 mm. ; Ijreadth, 1 mm. ; girth, 3 mm. 



May be sought during the months of May and June. 



Growth is complete by the end of June. 



The typical condition of the gall is unilocular and unilarval. 



The larva pupates in the gall. The imago emerges during 

 June and Julv. 



Parasites,' Nos. 62, 83, 104. 



This gall was first recorded for Britain by Professor 

 Trail, who found it at Braemar. It is also recorded 

 from Kew. 



The galls are small and inconspicuous. They are 

 found attached to the staminate catkins of Quercvi^ 

 sessiliflora, in groups of twos and threes, but some- 

 times as many as eight in one cluster. 



The shape of the gall is oviform, somewhat elongate, 

 rounded and narrow at the base, tapering towards the 



