BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 43 



519. 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 figs. 

 Treats of damage by many forest insects. 



520. HOPKINS, A. D. White grub. <W. Va. Farm Review, Aug- 



ust, 1899. 



521. HOWARD, L. O. The use of steam apparatus for spraying. 



<Yearbook U. S. Dept. Agric. f. 1896 (1897), pp. 69-88, 15- 

 tigs., 2 pis. 

 An account of the apparatus used for this purpose. 



522. 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. 



523. 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 Lecaniumjletcheri, and description of Coccophagus fletcheri n. sp. 



524. HOWARD, L. O. A leaf miner on tobacco. <Bull. No. 7, n. s. r 



Div. Ent., U. S. Dept. Agric., 1897, p. 76. 

 Xote on Gelechia piscipellis. 



525. 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 fig. 

 Notes on Olliffiella cristate. 



526. HOWARD, L. O. Damage by the white pine butterfly. <Bull. 



No. 7, n. s., Div. Ent., U. S. Dept. Agric., 1897, pp. 77-78. 

 Note on an outbreak of Xeophasia menapia. 



527. HOWARD, L. O. Meal worms in soda ash. <Bull. No. 7, n. s., 



Div. Ent., U. S. Dept. Agric., 1897, p. 81. 

 Xote on Tenebrio obscurus. 



528. HOWARD, L. O. Australian and New Zealand Coccidse. <Bull. 



No. 7, n. s., Div. Ent.,U. S. Dept. Agric., 1897, pp. 81-82. 

 Brief notes on several species. 



529. HOWARD, L. O. Two apple insects liable to importation. 



<Bull. No. 7. n. s., Div. Ent., U. S. Dept. Agric., 1897, p. 82. 

 Mention of Caccecia responsana and C. excessana. 



530. HOWARD, L. O. A new 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. 



531. HOWARD, L. 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. 



