LITERATURE CITED 437 
1939. Two unusual species of aphids infesting wheat. Jour. Ec. Ent. 32: 345-346. 
1945. Supplementary notes on ten described species of Lachnini. Ann. Ent. Soc. Amer. 
38: 447-453. 
PANZER, G. W. F. 
1801. Faunae Insectorum Germanicae initia oder Deutschlands Insecten. Heft 73-84. 
PASSERINI, GIOVANNI 
1856. Gli insetti autori delle galle del Terebinto e del Lent. Giornalei Giardini 6: 1-8. 
1860. Gli afidi con un prospetto dei generi ed alcune species nuove Italiane. Parma. 1-40. 
1863. Aphididae Italicae hucusque observatae. Archivo per la Zoologia, l’Anatomia c la 
Fisiologia. Vol. 2 fasc. 2: 129-212. 
PATCH, EDITH M. 
1907. The potato plant louse. Maine Agr. Expt. Sta. Bul. 147: 235-257. 
1909. Pemphigus venafuscus. Ent. News 20: 319-322. 
1910a. Four rare aphid genera from Maine. Maine Agr. Expt. Sta. Bul. 182: 241-248. 
1910b. Gall aphids of the elm. Maine Agr. Expt. Sta. Bul. 181: 193-240. 
1911. Two species of Macrosiphum. Maine Agr. Expt. Sta. Bul. 190: 81-92. - 
1912a. Aphid pests of Maine. Maine Agr. Expt. Sta. Bul. 202: 159-178. 
1912b. Woolly aphid migration from elm to mountain ash. Jour. Ec. Ent. 5: 395-398. 
1913a. Aphid pests of Maine: Part II. Maine Agr. Expt. Sta. Bul. 213: 73-92. 
1913b. Woolly aphids of the elm. Maine Agr. Expt. Sta. Bul. 220: 259-273. 
1914a. Maine aphids of the rose family. Maine Agr. Expt. Sta. Bul. 233. 
1914b. Currant and gooseberry aphids in Maine. Maine Agr. Expt. Sta. Bul. 225: 49-60. 
1915a. Woolly aphid of elm and juneberry. Maine Agr. Expt. Sta. Bul. 241: 197-204. 
1915b. The pond-lily aphid as a plum pest. Science 42: 164. 
1915c. Two clover aphids. Jour. Agr. Research 3: 431-433. 
1916. Elm leaf rosette and woolly aphid of the apple. Maine Agr. Expt. Sta. Bul. 256: 
329-344. 
1917. Eastern aphids, new or little known: Part I. Jour. Econ. Ent. 10: 416-420. 
1918. Eastern aphids: a few species of Prociphilus. Maine Agr. Expt. Sta. Bul. 270: 
45-46. 
1919. Three pink and green aphids of the rose. Maine Agr. Expt. Sta. Bul. 282: 205-209. 
1923a. The summer food plants of the green apple aphid. Maine Agr. Expt. Sta. Bul. 
313: 45-68. 
1923b. Aphididae in Hemiptera of Connecticut. Connecticut State Geol. and Nat. Hist. 
Survey Bul. 34: 250-256, 290-311, 329-335. 
1924. The buckthorn aphid. Maine Agr. Expt. Sta. Bul. 317: 29-52. 
1925a. Potato aphids. Maine Agr. Expt. Sta. Bul. 323: 9-36, 
1925b. The melon aphid. Maine Agr. Expt. Sta. Bul. 326: 185-196. 
1926. (See Griswold) 
1927. Two currant aphids that migrate to willow-herbs. Maine Agr. Expt. Sta. Bul. 336: 
1-8. 
1928. The foxglove aphid. Maine Agr. Expt. Sta. Bul. 346: 49-60. 
1929. The ‘apple aphid and the citrus aphid. Jour. Econ. Ent. 22: 698-699. 
PERGANDE, THEODORE 
1901. Two species of plant lice inhabiting both the witch-hazel and birch! U. S. Dept. 
Agr. Div. Ent. Tech. Ser. 9: 1-44. 
1902. The southern grain louse. U. S. Dept. Agr. Div. Ent. Bul. 38: 1-19. 
1904. On some of the aphides affecting grains and grasses of the United States. U. S. 
Dept. Agr. Div. Ent. Bul. 44: 1-23. 
PHILLIPS, W. J. 
1912. Phillips and Davis. Studies on a new species of Toxoptera. U. S. Dept. Agr. Bur. 
Ent. Tech. Ser. 25: 1-16. 
1916. Macrosiphum granarium, the English grain aphis. Jour. Agr. Res. 7: 463-480. 
RILEY, CHARLES V. 
1869. First annual report of the noxious, beneficial and other insects of the state of Mis- 
souri. 4th Ann. Rept. State Bd. Agr. for 1868: 3-180. 
1879, Biological notes on the Pemphiginae, with descriptions of new species. Bul. 
United States Geol. and Geog. Surv. Terr., 5: 1-17. 
1888. Further notes on the hop plant-louse. Insect Life I: 70-74. 
ROGERSON, J. P. 
1947. The oat bird-cherry aphis, Rhopalosiphum padi L. with R. crataegellum Theo. 
Bul. Ent. Research 38: 157-176. 
