AXDEICUS CIREATUS. 53 



The late Miss E. A. Ormerod, LL.D., found some of 

 these galls on a tree of Qnercus cerris in Js^ew gardens 

 in the year 1878, which, although not exactly cor- 

 responding with the continental form of this species, 

 were, however, considered by Cameron to be sufficiently 

 like those of A. circulans to warrant the inclusion of 

 this gall in the list as British. 



For many years I have most carefully examined 

 stubs and trees of Q. cerris but have failed to find the 

 galls. 



During dry and hot weather the long linear scales, 

 which are a noticeable feature of Q. cerris, close 

 towards one another over the galls and hide them from 

 view to so great an extent that detection is difficult, 

 but when the atmosphere is damp the scales relax and 

 stand out in such a manner as to allow the o'alls to l^e 

 seen. 



These galls are gregarious in their manner of growth, 

 occurring in clusters of three, four, or even eight, and 

 they are sometimes so closely packed together as to be 

 considerably flattened ; at times there may be one gall 

 in the centre with others arranged round it in a circle. 

 The normal shape is an elongate ovoid and very similar 

 to small ant pup^e. The walls of the gall are very 

 thin. 



The resemblance of these galls to those of the closely- 

 allied sj)ecies, A. hurgunclus, Grir., is very great. The 

 imagines, however, are quite different, and in addition 

 to this, the galls may be distinguished from each other 

 by the fact that those of A. hurgundus do not appear 

 until about five weeks later than those of A. circvlans. 



Andricus cirratus, Adler. 

 (Plate XIV, inset.) 



Andricus cirrohis, Mayr, Cameron. 



English name of gail. — " The Tufted Gall." 



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



Manner of growth. — Gregarious, pilose, concealed. 



