8 PUBLICATIONS OF BUREAU OF ENTOMOLOGY. 
No. 20. Proceedings of the eleventh annual meeting of the Association of Economic 
Entomologists. pp. 111, figs. 4. 1899. Price 10 cents. Postage 4 cents. 
No. 21. Preliminary report on the insect enemies of forests in the Northwest. An 
account of the results gained from a reconnaissance trip made in the spring and 
early summer of 1899. By A. D. Hopkins. pp. 27. 1899. Out of print. 
No. 22. Some miscellaneous results of the work of the Division of Entomology. IV. 
Prepared under the direction of L. O. Howard, Entomologist. pp. 109, figs. 28. 
1900. Price 10 cents. Postage 4 cents. 
No. 23. Some insects injurious to garden crops. A series of articles dealing with 
insects of this class. By F.H. Chittenden. pp. 92, figs. 23. 1900. Out of print. 
No. 24. A list of works on North American entomology. Compiled... by Nathan 
Banks. pp.95. 1900. Price 10 cents. Postage 4 cents. 
No. 25. Notes on the mosquitoes of the United States: Giving some account of their 
structure and biology, with remarks on remedies. By L. O. Howard. pp. 70, figs. 
22. 1900. Price 10 cents. Postage 3 cents. 
No. 26. Proceedings of the twelfth annual meeting of the Association of Economic 
Entomologists. pp. 102, pls. 2. 1900. Price 10 cents. Postage 4 cents. 
No. 27. Some insects injurious to the violet, rose, and other ornamental plants. A 
collection of articles dealing with insects of this class. By F. H. Chittenden. 
pp. 114, figs. 29, pls. 4. 1901. Out of print. 
Same, revised edition. pp. 114, figs. 29, pls. 4. 1901. Price 10 cents. Postage 4 
cents. 
No. 28. Insect enemies of spruce in the Northeast. A popular account of results of 
special investigations, with recommendations for preventing losses. ... By 
A. D. Hopkins. pp. 80, figs. 2, pls. 16. 1901. Price 10 cents. Postage 5 cents. 
No. 29. The fall army worm [Laphygma frugiperda 8. & A.| and variegated cutworm 
[Peridroma margaritosa Haw. (saucia Hiibn.)]. By F. H. Chittenden. pp. 64, figs. 
11. 1901. Price 5 cents. Postage 3 cents. 
No. 30. Some miscellaneous results of the work of the Division of Entomology. V. 
Prepared under the direction of L. O. Howard, Entomologist. pp. 98, figs. 29, pls. 2. 
1901. Price 10 cents. Postage 4 cents. 
No. 31. Proceedings of the thirteenth annual meeting of the Association of Economic 
Entomologists [1901]. pp. 103, figs. 4, pls. 2. 1902. Price 10 cents. Postage 4 
cents. 
No. 32. Insect enemies of the pine in the Black Hills Forest Reserve. An account of 
results of special investigations, with recommendations for preventing losses. By 
A.D. Hopkins. pp. 24, figs. 5, pls. 7. 1902. Price 10 cents. Postage 2 cents. 
No. 33. Some insects injurious to vegetable crops. A series of articles dealing with 
insects of this class. By F.H. Chittenden. pp. 117, figs. 30. 1902. Out of print. 
No. 34. The principal insects liable to be distributed on nursery stock. By Nathan 
Banks. pp. 46, figs. 47. 1902. Price 5 cents. Postage 2 cents. 
No. 35. Report on codling-moth [Carpocapsa pomonella L.] investigations in the 
Northwest during 1901. By C. B. Simpson. pp. 29, fig. 1, pls. 5. 1902. Price 10 
cents. Postage 2 cents. 
No. 36. An index to Bulletins Nos. 1-30 (new series) (1896-1901) of the Division of 
Entomology. By Nathan Banks. pp. 64. 1902. Price 5cents. Postage 3 cents. 
No. 37. Proceedings of the fourteenth annual meeting of the Association of Economic 
Entomologists. pp. 127, figs. 2, pl. 1. 1902. Price 10 cents. Postage 5 cents. 
No. 38. Some miscellaneous results of the work of the Division of Entomology. VI. 
Prepared under the direction of the Entomologist.. pp. 110, figs. 9, pls. 2. 1902. 
Price 10 cents. Postage 4 cents. 
No. 39. The culture of the mulberry silkworm [Bombyx mori L.].. By Henrietta Aiken 
Kelly. pp. 32, figs. 15. 1903. Out of print. 
(Cir. 76] 
