112 RRITISH OAK (JAI,LS. 



The remark anent a sexual form of iK a go ma (p. 

 110), applies to this species also. 



Occasionally examples will 1)e found developing on 

 the upper surface of a leaf. 



Dryophanta divisa, Adler. 

 (Plate XLIL) 



Dryophanta divisa, Mayr, Fitcli, Miiller ; Cynips divisa, Hartig ; 

 Spafhegaster verrucosus, Scliltdl., Adler, Licht., Mayr. 



English name of gall. — " The Eed Pea Grail." 



Position of gall. — On the under- sui-f ace of the mid-ril> and its 

 offshoots. 



Manner of growth. — Single, glabrous, glossy, globulose, 

 oblate. 



Colours. — Pale yellow, orange yellow, pinh, red, light brown. 



Average dimensions of a mature specimen. — Height, 

 5 nini. ; length. 6 mm. ; lireadth, 5 mm. 



May be sought during the months of June to October. 



Growth is complete by the end of September. 



The typical condition of the gall is unilocular and luiilarval. 



The larva pupates in the gall. The imago emerges dm-ing 

 Octolier and Noveml^er. 



Parasites, Nos. 19, 39. 44, 47, 49, 88, 95, 105, 119, 125, 151, 177, 

 180. Inquilines, Nos. 127. 134, 142. 



Alternate sexual generation : Spatliecjasier verrucosus, 

 Schltdl. 



With the aid of a lens it can be seen that the 

 surface of these galls is frequently dotted with minute 

 papillae, and occasionally there will be a well-defined 

 flat papilla a little darker than the surrounding 

 colour, opposite the basal attachment. 



The pink or red colour may be entirely absent, but 

 even when present its vividness fades with age, and it 

 is sometimes completely changed to a pale l^rown. 



This gall is similar in appearance to that of T). 

 ar/aina, but several features distinguish it from that 

 species ; e. (j. (a) very glossy surface, (b) pink colour, 

 (r) normally more numerous upon a leaf, and (d) more 

 widely distril^uted ; but the infallible characters are 

 (1) tlie thick walls, (2) small larval chamber, and (3) 



