16 PUBLICATIONS OF BUREAU OF ENTOMOLOGY. 
No. 24. The two-lined chestnut borer (Agrilus bilineatus Weber). By F. H. Chitten- 
den. pp. 8, fig. 1. July 14, 1897. Out of print. 
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. Out of print. 
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. Out of print. 
Same, revised edition. March 25, 1903. 
No. 30. The periodical cicada in 1898. By E. A. Schwarz. pp. 3. April 1, 1898. 
Out of print. 
No. 31. The striped cucumber beetle (Diabrotica vittata Fab.). By F. H. Chittenden. 
pp. 7, figs. 2. April 26,1898. Out of print. 
Same, revised edition. pp. 6, figs. 2. June 9, 1903. Out of print. 
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. Out of print. 
Same, revised edition. pp. 12, figs. 3. August 30, 1902. Out of print. 
Same, second revise. pp. 11, figs. 3. April 8, 1905. Out of print. 
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.) Out of print. 
No. 34. House ants (Monomorium pharaonis et al.). By C. L. Marlatt. pp. 4, figs. 3. 
July 6, 1898. Out of print. 
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. Out of print. (Superseded by No. 71.)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. Out of print. 
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. Out of 
print. 
9 
©) Same, corrected print. (Compare page 8.) pp. 10, figs. 3. January 10, 1899. Out 
of print. 
' Same, revised edition. pp. 10, figs. 3. October 2, 1903. Out of print. 
= 
Same, second revise. pp. 11; figs.3. Issued April 3, 1908. 
No. 38. The squash-vine borer ( Melittia satyriniformis Hbn.). By F. H. Chittenden. 
pp. 6, figs. 2. April 22, 1899. Out of print. 
Same, revised edition. pp. 6, figs. 2. November 19, 1903. Out of print. 
Same, second revise. pp. 6, figs. 2. Issued September 3, 1908. 
No. 39. The common squash bug (Anasa tristis De G.). By F. H. Chittenden. pp. 
5, figs. 3. May 5, 1899. Out of print. 
/ Same, revised edition. pp. 5, figs.3. March 28, 1905. Out of print. 
Same, second revise. pp. 5, figs. 3. Issued July 28, 1908. 
No. 40. How to distinguish the different mosquitoes of North America. By L. O. 
Howard (with synoptical tables of the North American mosquitoes; by D. W. 
Coquillett). pp. 8, figs. 3. February 20, 1900. Out of print. F 
[Cir. 76] 
