Preliminanj Catalogue of British Cecidomijidae. 377 



171. P. persicariae Linne, 1767, p. 977 (TipuJa); Kieffer 



1913-2, p. 79. 



On Polygonum amphibnm. Swanton, 324, 325 ; Houard 

 2157, 2159. 

 Durham, Urpeth. 



172. P. plicatrix H. Loew, 1850, p. 36 (Cecidomyia) : 



Kieffer, 1913-2, p. 79. 



On Rubus spp. Swanton, 479, 482, 490 ; Houard, 2966, 

 2978, 3025. , , , 



In some districts very common ; records from all counties. 



*173. P. polygalae KiefPer, 1909, p. 18 (gall) ; 1913-2, p. 79. 



In Pohjgala vulgaris, larvae in flower. See Houard, 

 3855. 



Durham, Birtley, Horden, Lanchester district (H. S. 

 AVallace and J. W. H. H.). Cumberland, Alston. 



*174. P. populeti Rubsaamen, 1889-2, p. 57 (Cecidomyia) ; 

 Kieffer, 1913-2, p. 79. 



On Populustremula and P. tremulae x alba. Houard, 503. 

 Durham, Gibside and near Winlaton Mill. Northum- 

 berland, on the Alnwick road four miles north of Morpeth. 



175. P. potentillae Wachtl, 1885, p. 193 (Cecidomyia): 

 Kieffer, 1913-2, p. 79. 



On Potentilla. 



*176. P. praticola Kieffer, 1892-1, p. 216 (Cecidomyia): 

 1913-2, p. 79. 



In flower Lychnis Flos-cucali. Houard, 2290. 

 Durham, Gibside, Billingham. 



*177. P. pteridicola Kieffer, 1901-2, p. 19 (Cecidomyia): 

 1913-2, p. 80. 



On Pteris aquilina, local. Houard, 69. 

 Northumberland, Ninebanks. Durham, Fatfield, Birt- 

 ley. 



*178. P. pustulans Rubsaamen, 1889-1, p. 378 (Cecidomyia) ■ 

 Kieffer, 1913-2, p. 80. 



On Spiraea Ulmaria, local. Houard, 2838. 



