382 Messrs. R. S. Bagnall and J. W. H. Harrison's 



205. P. tiliamvolvens {tiliae Schr., gall), Riibsaamen, 

 1889-2, p. 55 {Cecidomyia) ; Kieffer, 1913-2, p. 82. 



On Tilia sp. Swanton, 618 ; Houard, 4160. 

 Durham, Castle Eden Dene. 



*206. P. tortrix F. Loew, 1877, p. 6 {Cecidomyia) ; Kieffer, 

 1913-2, p. 82. 



On («) Prunus domestica, wild, and (6) P. spinosa. 

 Houard, 3269, 3274, 3282. 



NoRTHUMBEELAND, near Minsteracres, (a) H. 3269 and 

 3274.-J- Yorkshire, Bardsey near Leeds. Lancashire, 

 gall (a) H. 3274 only, near Lindale; Blackburn district 

 (Gr. W. Nixon), perhaps referable to P. sodalis or both 

 species. Mr. Burkill, 1916, records this species from P. 

 spinosa, Devon. 



207. P. trachelii Wachtl, 1885, p. 195 (Cecidomyia) ; 

 Kiefter, 1913-2, p. 82. 



On Campanula rotimdifolia. Swanton, 796, 797 ; Houard, 

 5513. 

 Durham, near Wolsingham. 



*208. P. trail! Kieffer, 1909, p. 25 (gall) ; 1913-2, p. 82. 



On Ranunculus acris, = Cecidomyid sp. Houard, 2420. 

 Northumberland, Ovingham. Durham, near Penshaw. 



209. P. trifolii F. Loew, 1874, p. 143 {Cecidomyia); 

 Kieffer, 1913-2, p. 82. 



On Trifolium spp. Swanton, 568, 569, 572, 577 ; Houard, 

 3589-91-96-64. 



Records from all counties excepting Westmoreland. 



*210. Perrisia sp. Burkill, 1916. 



On Trifolium pratense, leaflets folded into a pod resem- 

 bling the gall caused by P. trifolii, but each gall is occupied 

 by a white larva. 



Durham, near Hylton. Northumberland, Wark worth. 

 Recorded by Mr. Burkill from Derbyshire. 



•f Perrisia sodalis may also occur in the gall 3274, but the presence 

 of 3269 enables one to definitely record P. tortrix. 



