DRYOPHAXTA SCUTELLAEIS. 115 



tember, the imagines will continue to emerge during 

 the following month, and until the middle of 

 December. 



Albert Miiller appears to have been the first to 

 record this species occurring in Britain, having found 

 it about forty years ago in the neighbourhood of 

 Norwood. 



It is moderately abundant in the Hastiness district. 

 I have found it almost exclusively on oak bushes of 

 Q. 2)eclunciLlata in woods where there are also large 

 oak trees ; the earliest date being June oOth. 



Verv rarely more than eight galls develop on one 

 leaf. 



Dryophanta scutellaris, Hartig. 



(Plates I, XLIV, XLV.) 



Cyni-ps quercus folii, Linu. ; C. folii, Hartig, Sclieuck, Schltdl. ; 

 C. scutellaris, Sclieiick ; Dryophanta folii, Mayr, Miiller, Marshall, 

 Camerou ; D. scutellaris, Mayr, Oliver, Fitch, Adler. 



English name of gall. — " The Cherry Gall." 



Position of gall. — On the imder-surface of the luid-ril) and its 

 offshoots. 



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

 succulent. 



Colours. — Pale yellow, yellowish-green, pale green, pink, rose- 

 madder. 



Average dimensions of a mature specimen. — Globulose 

 form — diameter, 17 mm. 



May be sought during the months of July to October, and on 

 fallen leaves until April or May of the follo-ndng year. 



Growth is complete by the end of August. 



The typical condition of the gall is iiniloeular and unilarval. 



The larva pupates in the gall. The imago emerges during the 

 autvinin and winter. " According to some observers the flies appear 

 in October, and according to others not until March ... if kept 

 in a room they appear in November, but not ... if in the open 

 air. The fly begins in October to gnaw a passage from the central 

 chamber . . . towards the periphery, but does not cjuit the gall 

 . this depends entirely upon the weather. . . . I have re- 

 peatedly noticed that the warm days of January and Feliruary 

 entice the flies out . . . but should frost continue many flies 

 do not appear until March '" (Adler, ' Alternating Generations,' 

 p. 61). 



