A SYNOPSIS OF THE APHIDIDAE 171 



Pimpinella 



155. Siphocoryne capreae (Fabr.) 

 Pine, see Pinus 



Pinus (pine) 



178. Chermes cooleyi Gillette 



179. Chermes pinicorticis Fitch 

 43. Essigella californica (Essig) 

 45. Laclmus ferrisi Swain 



48. Lachnus oregonensis Wilson 



49. Lachnus pini-radiatae Davidson 



50. Lachnus .ponderosa Williams 

 52. Lachnus sabinianus n.sp. 



53a. Lachnus tomentosa (De Geer) (Addenda) 

 176. Mindarus abietinus Koch 

 Pisum (pea) 



74. Macrosiphum pisi (Kalt.) 

 Pittosporum (pittosporum) 



139. Aphis pomi De Geer 



79. Macrosiphum solanifolii (Ashmead) 

 104. Jlhopalosii>hum persicae (Sulz.) 

 Plantago (plantain) 



123. Aphis gossypii Glover 

 129. Aphis malifoliae Fitch (?) 



88. Hyzus circumflexus (Buckton) 

 Plantain, see Plantago 

 Plantain, Water, see Alisma 

 Plat anus (western sycamore) 



4. Drepanosiphum platanoides (Schrank) 

 Plum, see Prunus 

 Polygonum (knotweed) 



100. Rhopalosiphum hippophaes (Koch). 



156. Siphocoryne nymphaeae (Linn.) 

 Pomegranate, see Punica 



Pondweed, see Potamogeton 



Poplar, see Populus 



Poppy, see Papaver 



Poppy, California, see Eschscholtzia 



Populus (poplar, cottonwood) 



28. Arctaphis populifolii (Essig) 



164. Pemphigus bctae Doane 



165. Pemphigus populi-caulis Fitch 



166. Pemphigus populi-transversus Eiley 

 181. Phylloxerina popularia (Pergande) 



40. Ptcrocomma populifoliae (Fitch) 



167. Thecabius calif ornicus (Davidson) 



168. Thecabius populiconduplifolius (Cowen) 



169. Thecabius populi-monilis (Eiley) 



34. Thomasia populicola (Thomas) 



35. Thomasia salicola (Essig) 

 Potamogeton (pondweed) 



156. Siphocoryne nymphaeae (Linn.) 

 Potato, see Solarum 



