428 APHIDS OF THE ROCKY MOUNTAIN REGION 
CHOLODKOVSKY, N. 
1896a. Aphidologische Mitteilungen 2. Zool. Anz. 
1896b. To the knowledge of Lachnus species on Picea excelsa. Zool. Anz. 19 No. 499. 
1896c. Uber die auf Nadelholzern vorkommenden Pemphigiden. Zool. Anz. No. 505. 
1898. Beitrage zu einer Monographie der Coniferen-lause. Theil II. Die Gattung Lach- 
nus Burm. Horae Soc. Ent. Ross. 31: 603-674. 
1899. Aphidologische Mitteilungen. Zool. Anz. 22: 468-477. 
1908. Aphidologische Mitteilungen. Zool. Anz. 32: 687-693. 
CLARKE, WARREN T. 
1903. A list of California Aphididae. Canad. Ent. 35: 247-254. 
COCKERELL, T. D. A. 
1893. The Entomology of the mid-alpine zone of Custer County, Colorado. Trans. Amer- 
ican Ent. Soc. 20: 365. 
1901. A new plant-louse injuring strawberry plants in Arizona. Canad. Ent. 33: 101. 
1902. A new plant-louse from southern California. Bul. 8. California Acad. Sci. 1: 40. 
1903a. Some Aphididae of the genus Nectarophora from New Mexico. Canad. Ent. 35: 
167-171. 
1903b. A new aphid on Lonicera. Canad. Ent. 35: 342-343. 
1903c. Aphididae. Trans. American Ent. Soc. 29: 114-116. 
1903d. A new aphid on thistle. Ent. News 14: 248. 
1904. Some notes on Aphididae. Canad. Ent. 36: 262-263. 
1905. Pemphigus cowen!, new species. Canad. Ent. 37: 392. 
1906. Pemphigus vagabundus Walsh. Ent. News 16: 34. 
COCKERELL, WILMATTE PORTER 
1901. W. P. and T. D. A. Cockerell. A new gooseberry plant-louse. Canad. Ent. 33: 
227-228. 
1903. Some aphids associated with ants. Psyche 10: 216-218. 
COWEN, J. H. (IN GILLETTE AND BAKER) 
1895. Aphididae. Bul. Agr. Expt. Sta. Colorado Tech. Ser. 1: 115-125. 
COX, JAMES A. 
1939. A preliminary report on the woolly aphids of apple and hawthorn. Jour. Econ. 
Ent. 32: 477-483. 
CURTIS, J. 
1835. x x x British Entomology, 12, sec. 576. 
CUTRIGHT, CLIFFORD R. 
1925. Subterranean aphids of Ohio. Ohio Agr. Expt. Sta. Bul. 387: 175-238. 
DAS, BASHAMBAR 
1918. The aphididae of Lahore. Mem. Indian Mus. 6: (4): 135-274. 
DAVIDSON, J. 
1921. Biological studies of Aphis rumicis L. Bul. Ent. Research 12: 81-89. 
1925. List of British aphides. London. p. XI ++ 176. 
DAVIDSON, W. M. 
1909. Notes on Aphididae collected in the vicinity of Stanford University. Jour. Econ. 
Ent. 2: 299-305. 
1910. Further notes on the Aphididae collected in the vicinity of Stanford University. 
Jour. Econ. Ent. 3: 372-381. 
191la. Two new aphids from California. Jour. Econ. Ent. 4: 559-562. 
1911b. A correction. Jour. Econ. Ent. 4: 414. 
1912. Aphid notes from California. Jour. Econ. Ent. 5: 404-413. 
1914a. Plant-louse notes from California. Jour. Econ. Ent. 7: 127-141. 
1914b. Walnut aphides in California. U. S. Dept. Agr. Bul. 100: 1-48. 
1915. Little-known western plant-lice. I. Jour. Econ. Ent. 8: 419-429. 
1917a. The reddish-brown plum aphis (Rhopalosiphum nymphaeae Linn.). Jour. Econ. 
Ent. 10: 350-353. 
1917b. Little known western plant lice. II. Jour. Econ. Ent. 10: 290-297. 
1919a. Life history and habits of the mealy plum aphis. U.S. Dept. Agr. Bul. 774: 1-16. 
1919b. New aphids from oaks. Canadian Ent. 51: 245-248. 
1920. A new Myzocallis. Canadian Ent. 52: 176. 
DAVIS, JOHN J. 
1908a. Studies on Aphididae. I. Ann. Ent. Soc. America I: 251-264. 
1908b. Notes on the life history on the leafy dimorph of the boxelder aphid, Chaito- 
phorus negundinis Thos. Ann. Ent. Soc. America I: 130-132. 
1909a. Studies on Aphididae. II. Ann. Ent. Soc. America 2: 30-42. 
