BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
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531. 
Hopkins, A. D. Report on investigations to determine the 
cause of unhealthy conditions of the spruce and pine from 
1880 to 1893. <Bull. No. 56, W. Va. Agric. Exp. Sta., April, 
1899, pp. 197-461, 99 tigs. 
Treats of damage by many forest insects. 
Hopkins, A. D. White grub. <W. Va. Farm Review, Aug¬ 
ust, 1899. 
Howard, L. O. The use of steam apparatus for spraying. 
<Yearbook L T . S. Dept. Agric. f. 1896 (1S97), pp. 69-88, 15 
tigs., 2 pis. 
An account of,the apparatus used for this purpose. 
Howard, L. O. Some insects affecting the hop plant. <Bull. 
No. 7, n. s., Div. Ent., U. S. Dept. Agric., 1897, pp. 40-51, 
4 figs. 
Treats of Hydrcecia immanis, Hypena humuli, Polygonia interrogatonis, and 
P. comma. 
Howard, L. O. A case of excessive parasitism. <Bull. No. 7, 
n. s., Div. Ent., U. S. Dept. Agric., 1897, pp. 62-63. 
Parasites of Lecanium fletcheri, and description of Coccophagus fletcheri n. sp. 
Howard, L. O. A leaf miner on tobacco. <Bull. No. 7, n. s., 
Div. Ent., U. S. Dept. Agric., 1897, p. 76. 
Note on Gelechici piscipellis. 
Howard, L. O. A gall-making coccid in America. <Bull. No. 
7, n. s., Div. Ent., U. S. Dept. Agric., 1897, pp. 76—77, 1 tig. 
Notes on OUiffiella cristata. 
Howard, L. O. Damage by the white pine butterfly. <Bull. 
No. 7, n. s., Div. Ent., IT. S. Dept. Agric., 1897, pp. 77-78. 
Note on an outbreak of Neophasia menapia. 
Howard, L. O. Meal worms in soda ash. <Bull. No. 7, n. s., 
Div. Ent., U. S. Dept. Agric., 1897, p. 81. 
Note on Tenebrio obscurus. 
Howard, L. O. Australian and New Zealand Coccidee. <Bull. 
No. 7, n. s., Div. Ent., IT. S. Dept. Agric., 1897, pp. 81-82. 
Brief notes on several species. 
Howard, L. O. Two apple insects liable to importation. 
<7 Bull. No. 7, n. s., Div. Ent., U. S. Dept. Agric., 1897, p. 82. 
Mention of Caccecia responsana and C. excessana. 
Howard, L. O. A nesv direct benefit from insects. <Bull. No. 
7, n. s., Div. Ent., U. S. Dept. Agric., 1897, p. 82. 
Rearing of spiders for use in wine cellars. 
Howard, E. O. Notes from correspondence. <Bull. No. 7, 
n. s., Div. Ent., U. S. Dept. Agric., 1897, pp. 84-87. 
Short notes on a number of insects. 
