PHYTOLOGY. 



SCOTTISH GALLS. 



( Continued from p. 12Z.J 

 By J. W. H. TRAILL, M.A. 



They are smooth, diaphanous, green usually when attached 

 to the leaf, red partially or entirely when attached to the 

 catkins; in this latter case they look much like a bunch of 

 red currants. They are monothalamous, and have very 

 thick fleshy walls. The insects eat their way out of the 

 galls in June and July, (q) 1 found several galls of Trigon- 

 aspis 7nagaptera Panzer in the month of June, both last year 

 and this year, in Parkhill woods. They were on the trunks 

 of oaks, in crevices of the bark. Sometimes two are more 

 or less united, but usually they are separate. When well 

 formed they are globular, pea-sized, smooth and naked; and 

 are bright red in colour. They are monothalamous, with 

 rather thick fleshy walls. Like the last they soon shrivel 

 up, and disappear early in July. This year I have reared a 

 good number of the insects, (r ) Galls of Andricus infiator 

 Hartig, were in June found by me on an oak bush on 

 Craigandarroch at Ballater. They are terminal (or axillary) 

 swellings on the young branches, of an ovate form, about \ 

 inch by |- inch; smooth externally, or with small leaves or 

 leaf scales attached ; open by a small hole at the apex 

 across which a thin membrane is stretched. Colour green 

 brownish near the apex. Walls thin, cavity large, containing 

 at the bottom a small ovate inner gall about -fa inch by ^ 

 inch. This is attached by its base to the bottom of the 

 cavity, its apex pointing to the opening in the outer gall. 

 It is brownish black, thin and papery, yielding readily on 

 pressure. The remaining species of oak galls are, I believe 

 new to Britain, (s) Galls of Andricus quadrilineaius Hartig 

 occurred to me commonly on oaks at Banchory on June 7th 



