48 
BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 
584. Howard, L. O. The principal insects affecting - the tobacco 
plant. <Yearbook U. S. Dept. Agric. f. 1898 (May, 1899), 
pp. 120-150, 25 figs. 
Detailed account of the various species known to injure tobacco. 
585. Howard, L. O. The extermination of the mosquito. <Sci. 
Amer. Supp., 3 June, 1899, p. 19593. 
Regarding the so-called permanganate of potash remedy. 
586. Howard, L. O. Pests of the hop crop. <Hop Industry, 
Orange Judd Co., New York, 1899, pp. 113-141, 19 rigs. 
Accounts of the species known to affect hops. 
587. Howard, L. O. Wheat-head army worm. <Southern Planter, 
August, 1899. 
588. Howard, L. O. A remedy for gadflies: Porchinskrs recent 
discovery in Russia, with some American observations. 
<Bull. No. 20, n. s., Div. Ent., U. S. Dept. Agric., Novem¬ 
ber, 1899, pp. 24-28. 
589. Howard, L. O. The present status of the capritig experiments 
in California. <Bull. No. 20, n. s., Div. Ent., U. S. Dept. 
Agric., November, 1899, pp. 28-35. 
A resume of the subject. 
590. Howard, L. O. Report of the entomologist for 1899. <Rept. 
Seer. Agric. 1899, pp. 43-52, December, 1899. 
591. Howard, L. O., and Marlatt, C. L. The original home of the 
San Jose scale. <Bull. No. 20, n. s.,Div. Ent., U. S. Dept. 
Agric., November, 1899, pp. 36-39. 
A consideration of the evidence as to origin of the scale. 
592. Hoyt, M. A. Killing peach tree borers. <Colman’s Rural 
World, 8 July, 1897, p. 211. 
Using hot water. 
593. Hubbard, IT G. The ambrosia beetles of the United States. 
<Bull. No. 7, n. s., Div. Ent., U. S. Dept. Agric., 1897, pp. 
9-30, 34 figs. <Yearbook U. S. Dept. Agric. f. 1896 (1897), 
pp. 421-430. 
The life history of certain Scolytidse. 
594. Hubbard, H. G., and Pergande, Theo. A new coccid on birch. 
<Bull. No. 18, n. s., Div. Ent., U. S. Dept. Agric., 1898, 
pp. 13-26, 8 figs. 
Description and life history of Xylococcus betulse. 
595. Hunter, S. J. The more destructive grasshoppers of Kansas. 
<Bull. Dept. Entom. Univ. Ivans., October, 1897, pp. 11, 
pis. 4. 
Treats of a number of species, with remedies. 
596. Hunter, S. J. Guard against San Jose scale. <Kansas Farmer, 
9 December, 1897. 
