NEW BRITISH CECIDOMYIDiE. 



153 



Rhabdophaga geininarum, Rubs. 



On enlarged buds of Salix aurita and S. cinerea. 



Durham and Northumberland, widespread in sub-alpine districts. 



Rhabdophaga jaapi, Rubs. 



On Salix repens, small somewbat elongated leaf-rosette. 

 Durham, Blackball Rocks. 



Rhabdophaga nielseni, K. 



On Salix pentandra. Stem very slightly swollen, reddish larva? 

 feeding in cavities in wood and pitb ; larva hybernates therein, and the 

 stem blackens just prior to emergence of the midges. 



Durham, Waldridge Fell. 



Rhabdopliaga sp. 



On Salix aurita, Houard S. 22. 

 Durham, Gibside. 



Schmidtiella gemiiiarum, Rubs. 



B. and H. 23. Houard No. 125. 



Northumberland, Durham, Lancashire and Westmorland. Scat- 

 tered in Juniper areas. 



Perrisia auritae, Rubs. 



On Salix aurita, S. cinerea, leaves rolled as in P. mar ginemtor aliens ; 

 larva? distinct. 



Northumberland and Durham. In sub-alpine localities not un- 

 common. 



Perrisia bistortae, K. 



On Polygonum bistorta and P. persicaria ; similar to gall of P. 

 persicariae, larva? white. 



Northumberland, Bamburgh, Prestwick Carr and Ebchester. 



Perrisia bryoniae, Bouche. 



By a slip of the pen this species was recorded (B. and H. 105) in 

 place of P. parvula. This forms a cerminal irregular rosette of pilose 

 leaves on Bryonia dioica, larva? white. 



Herts, near Letchworth, June, 1920. 



Perrisia angelicae, Riibs. = B. and H. 365. 



Excessively abundant on howers of Angelica. 

 Northumberland, Durham and N. Yorks, everywhere. 



Perrisia dittrichii, Rubs. 



On Silaus pratensis, leaves thickened and crumpled, larva? yellow. 

 Northumberland, Seaton Sluice. Durham, nr. Fatfield. 



Perrisia francoisi, K. = B. and H. 394. 



