LIST OF CIRCULARS 1 TO 100. 3 
Same, Spanish edition. pp. 10. 
Same, German edition. pp. 11. 
No. 19. The clover mite (Bryobia pratensis Garman). By C. L. Marlatt. pp. 4, fig. 1. 
March 5, 1897. 
Same, second edition. pp. 4, fig. 1. July 19, 1897. 
No. 20. The woolly aphis of the apple (Schizoneura lanigera Hausmann). By C. L. 
Marlatt. pp. 6, figs. 2. March 15, 1897. 
Same, revised edition. pp. 6, figs. 2. June 23, 1908. 
No. 21. The strawberry weevil (Anthonomus signatus Say). By F. H. Chittenden. 
pp. 7, figs. 4. March 18, 1897. 
Same, revised edition. pp. 10, figs. 5. Issued September 19, 1908. 
No. 22. The periodical cicada in 1897. By E. A. Schwarz. pp. 4. May 1, 1897. 
No. 23. The buffalo tree-hopper (Ceresa bubalus Fab.). By C. L. Marlatt. pp. 4, 
figs. 2. May 10, 1897. 
No. 24. The two-lined chestnut borer (Agrilus bilineatus Weber). By F. H. Chitten- 
den. pp. 8, fig. 1. July 14, 1897. 
Same, revised edition. pp. 7, fig. 1. Issued January 20, 1909. 
No. 25. The ox warble (Hypoderma lineata Villers). By C. L. Marlatt. pp. 10, 
figs. 10. July 19, 1897. 
No. 26. The pear slug (Hriocampoides limacina Retzius). By C. L. Marlatt. pp. 7, 
figs. 4. August 28, 1897. 
No. 27. The Mexican cotton-boll weevil in 1897. By L.O. Howard. pp.7. Decem- 
ber 31, 1897. 
No. 28. The box-elder plant-bug (Leptocoris trivittatus Say). By L. O. Howard. 
pp. 3, fig. 1. January 8, 1898. 
No. 29. The fruit-tree bark-beetle (Scolytus rugulosus Ratz.). By F. H. Chittenden. 
pp. 8, figs. 5. March 25, 1898. 
Same, revised edition. March 25, 1903. 
No. 30. The periodical cicada in 1898. By E. A. Schwarz. pp.3. April 1, 1898. 
No. 31. The striped cucumber beetle (Diabrotica vittata Fab.). By F. H. Chittenden. 
pp. 7, figs. 2. April 26, 1898. 
Same, revised edition. pp. 6, figs. 2. June 9, 1903. 
Same, second revision. pp. 8, figs. 2. Issued May 22, 1909. 
No. 32. The larger apple-tree borers. By F. H. Chittenden. pp. 12, figs. 3. July 1, 
1898. 
Same, revised edition. pp. 12, figs. 3. August 30, 1902. 
Same, second revise. pp. 11, figs. 3. April 8, 1905. 
Same, third revise. pp. 11, figs. 3. Issued December 10, 1907. 
No. 33. Remedial work against the Mexican cotton-boll weevil. By L. O. Howard. 
pp. 6. July 1, 1898. (Supplementary to circulars 18 and 27.) 
No. 34. Houseants (Monomorium pharaonis et al.). By C. L. Marlatt. pp. 4, figs. 3. 
July 6, 1898. 
Same, revise. pp. 4, figs. 3. Issued June 12, 1907. 
No. 35. House flies (Musca domestica et al.). By L.O. Howard. pp. 8, figs. 6. July 
11, 1898. (Superseded by No. 71.) 
No. 36. The true clothes moths (Tinea pellionella et al.). By C. L. Marlatt. pp. 8, 
figs. 3. July 18, 1898. 
Same, revise. pp. 8, figs. 3. Issued January 15, 1908. 
No. 37. The use of hydrocyanic-acid gas for fumigating greenhouses and cold frames, 
By Albert F. Woods and P. H. Dorsett. pp. 10, figs. 3. January 10, 1899. 
Same, corrected print. (Compare page 8.) pp. 10, figs. 3. January 10, 1899. 
Same, revised edition. pp. 10, figs.3. October 2, 1903. 
Same, second revise. pp. 11, figs.3. Issued April 3, 1908. 
