Preliminary Cdhdogue of British Cecidomyidae. 383 



*211. Perrisia sp. Burkill, 1916. 



On Trifolium repens, leaves thickened and forming a 

 firm fleshy gall, with aborted buds inside, among which 

 live several larvae. 



Recorded by Mr. Burkill from Surrey. 



212. P. tubicola Kieii'er, 1889-1, p. 188 (Cecidomyia) ; 

 1913-2, p. 82. 



On Cytisus scoparius. Swanton, 559 ; Houard, 3423. 

 Northumberland and Durham, several records. Cum- 

 berland, Keswick. Lancashire, Freshfield. 



*213. P. ulicis KiefTer, 1909. p. 31 (gall); 1913-2, p. 82. 



On Ulex, = Cecidomyid sp. Houard, 3396. 



Northumberland, between Alnmouth and Warkworth. 

 Durham, Gibside, Waldridge (gall only). Lancashire, 

 Grange-over-Sands (signs). Yorkshire, Eston (old galls). 



211. P. ulmariae Bremi, 1847, p. 52 (Cecidomyia); Kieft'er, 

 1913 2, p. 82. 



On Spiraea JJlmaria. Swanton, 475 ; Houard, 2839. 

 Common ; records from all counties. 



215. Perrisia sp. 



On Spiraea Filipendula. Perrisia ulmaria of Swanton, 

 476 and Houard, 2830. Swanton (1912, p. 64) suggests 

 the name P. filipendidae for this gall, but that name has 

 already been used by Kiefl[er (1909, p. 29) for another 

 species affecting the same plant. 



*216. P. ulmicola Kieffer, 1909, p. 31 (gall and larva); 

 1913-2, p. 82. 



On Ulmns. 



Durham, Burnmoor, Gibside, Norton. Northumber- 

 land, Warkworth, rare. Yorkshire, Bardsey, near Leeds. 



217. P. urticae Ferris, 1840, p. 403 {Cecidomyia); 1913--2, 

 p. 82. 

 On Urtica dioica and (more rarely) on U . vrens. Swanton, 

 312, 316; Houard, 2095, 2099. 

 Very common everywhere. 



