38 THE HOP APHIS IN THE PACIFIC REGION. 
THE MORE IMPORTANT WRITINGS ON THE HOP APHIS. 
1904. Clarke, W. T.— Bui. 160, Univ. Cal. Agr. Exp. Sta., 13 pp., 7 figs. 
1897. Cordley, A. B— Bui. 45, Oreg. Agr. Exp. Sta., pp. 99, 127, 13 figs., June. 
Habits and remedies. 
1903. Felt, E. P.— Proc. 24th Ann. Meet. Soc. Prom. Agr. Sci., pp. 39-48. 
1865. Fitch, A.— The Country Gentleman, vol. 25, p. 274, April 27. 
Destructiveness, enemies, and remedies. 
1904. Fletcher, J.— Bui. 46, Div. Ent., U. S. Dept. Agr., pp. 82-88, May. 
1904. Fletcher, J. — Rept. Exp. Farms Canada, pp. 163-215. 
1887. Howard, L. O. — Country Gentleman, vol. 52, p. 875, November 17. 
First published full life history. 
1897. Howard, L. O.— Bui. 7, n. s., Div. Ent., U. S. Dept. Agr., pp. 84-87. 
1899. Howard, L. O— Hop Industry, Orange Judd Co., New York, pp. 113-141, 19 
figs. 
Accounts of the species known to affect hops. 
1893. Koebele, A. — Insect Life, vol. 6, pp. 12-17, November. 
Experiments with hop louse in Oregon and Washington. 
1887. Lintner, J. A.— Cultivator and Country Gentleman, vol. 52, p. 511, June 30. 
Remedies. 
1889. Lintner, J. A. — New England Homestead, p. 253, July 27. 
Remedies for hop aphis. 
1891. Lintner, J. A. — New England Homestead, p. 193, May 2. 
How to control the hop aphis. 
1900. Lugger, O— Bui. 69, Minn. Agr. Exp. Sta., pp. 250, 200 figs., 16 pis. 
1904. Pettit, R. H.— Spec. Bui. 24, Mich. Agr. Exp. Sta., pp. 79, 70 figs. 
1908. Remisch, Fr. — Zeitschrift. fur wissenshaftliche Insektenbiologie, vol. 4, no. 10, 
pp. 365-366. 
Important enemy of hops. 
1910. Remisch, Fr. — Zeitschrift fur wissenshaftliche Insektenbiologie, vol. 6, no. 6, 
p. 242. 
Mentioned in article on Adalia bipunctata as the principal food of that species. 
1911. Remisch, Fr. — Zeitschrift fur wissenschaftliche Insektenbiologie, vol. 7, nos. 
7-8, pp. 240-243; no. 9, pp. 282-285. 
Article, "The hop leaf louse, Aphis humuli." 
1891. Riley, C. V.— Cir. 2, 2d ser., Div. Ent., U. S. Dept. Agr;, pp. 7, 5 figs., 1 pi., 
June. 
1891. Riley, C. V.— Insect Life, vol. 3, pp. 181-210, January. 
1893. Riley, C. V.— Ann. Rept, U. S. Dept. Agr., pp. 199-226, 3 pis. 
1891. Riley, C. V., and Howard, L. O. — Insect Life, vol. 3, p. 350, April. 
1891. Riley, C. V., and Howard, L. O. — Insect Life, vol. 3, p. 486, August. 
Hop lice on Pacific Coast. 
1891. Riley, C. V., and Howard, L. O. — Insect Life, vol. 4, p. 84, October. 
Quassia for the hop aphis. 
1892. Riley, C. V., and Howard, L. O— Insect Life, vol. 4, pp. 342-343, June. 
Hop louse in the extreme northwest. 
1892. Riley, C. V., and Howard, L. O.— Insect Life, vol. 4, p. 401, August, 
Hop aphis remedies. 
1892. Riley, C. V., and Howard, L. 0— Insect Life, vol. 4, p. 406, August, 
The hop louse in Oregon. 
1892. Riley, C. V., and Howard, L. O. — Insect Life, vol. 5, p. 60, September. 
The hop plant-louse in Washington. 
1893. Riley, C. V., and Howard, L. O. — Insect Life, vol. 6, p. 53, November. 
Hop lice in New York State. 
