Preliminary Catalogue of British Cecidomyidne. 377 



171. P. persicariae l^iiine, 1767, p. 977 (Tipula); Kiefi'er, 



1913-2, p. 79. 



0\\ Polygonum am2)Jiihiu in. Swantoii, 324,325; Houard, 

 2157, 2159. 

 Durham, Urpeth. 



172. P. plicatrix H. Loew, 1850, p. 36 {Cecidomyia); 



Kiefter. 1913-2, p. 79. 



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

 2978, 3025. 



In some districts very comnior, ; records from all counties. 



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



In Polygala vulgaris, larvae in flower. See Houard, 

 3855. 



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

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



*174. P. populeti Rlibsaamen, 1889-2, p. 57 {Cecidomyia); 

 Kielt'er, 1913-2, p. 79. 



On Popidustremida and P. treniulae 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 Potent ilia. 



*176. P. praticola Kieffer, 1892-1, p. 216 {Cecidomyia); 

 1913-2, p. 79. 



In flower Lychnis Flos-cucidi. Houard, 2290. 

 Durham, Gibside, Billingham. 



*177. P. pteridicola Kiefi'er, 190] 2, p. 19 {Cecidomyia); 

 1913-2, p. 80. 



On Pteris aquilina, local. Houard, 69. 

 Northumberland, Ninebaidvs. Durham, Fatfield, Birt- 

 ley. 



*178. P, pustulans Rlibsaamen, 1889-1, }). 378 {Cecidomyia); 

 Kieffer, 1913-2, p. 80. 



On Sjyiraea Ulmaria, local. Houard, 2838. 



