LIST OF CIRCULARS 1 TO 100 OF THE BUREAU OF ENTOMOLOGY. 
No. 1. Condensed information concerning some of the more important insecticides. 
pp. 7. May, 1891. 
No. 2. The hop plant-louse [Phorodon humuli Schr.] and the remedies to be used 
againstit. pp. 7, figs. 5, pl. 1. June, 1891. 
No. 3. An important enemy to fruit trees. The San Jose scale [ Aspidiotus perniciosus 
Comst.]: Its appearance in the eastern United States; measures to be taken to 
prevent its spread and to destroy it. By L. O. Howard. pp. 10, figs. 5. April 4, 
1893. 
No. 4. The army worm (Leucania unipuncta Haw.). By L. O. Howard. pp. 5, figs. 
3. June 16, 1894. 
No. 5. The carpet beetle or “ Buffalo moth” (Anthrenus scrophulariz L.). By L. O. 
Howard. pp. 4, fig. 1. September 8, 1894. 
Same, revised edition. pp. 4, fig. 1. Issued August 10, 1908. 
No. 6. The Mexican cotton-boll weevil (Anthonomus grandis Boh.). By L. O. How- 
ard. pp. 5, figs. 3. April 2, 1895. 
Same, Spanish edition. pp. 6, figs. 2. April 2, 1895. 
No. 7. The pear-tree psylla (Psylla pyricola Foerst.). By C. L. Marlatt. pp. 8, figs. 
6. May 1, 1895. 
No. 8. The imported elm leaf-beetle (Galerucella luteola Mill.; Galeruca xanthomelxna 
Schrank). By C. L. Marlatt. pp. 4, fig. 1. May 28, 1895. 
Same, revised edition. pp. 6, fig. 1. Issued September 22, 1908. 
No. 9. Cankerworms [Paleacrita vernata Peck and (Anisopteryx) Alsophila pometaria 
Harr.]. By D. W. Coquillett. pp. 4, figs. 4. May 24, 1895. 
No. 10. The Harlequin cabbage bug, or calico back (Murgantia histrionica Hahn). 
By L. O. Howard. pp. 2, fig. 1. May 24, 1895. 
No. 11. The rose-chafer [ Macrodactylus subspinosus Fab.]. By F. H. Chittenden. 
pp. 4, fig. 1. May 21, 1895. 
Same, revised. pp. 4, fig. 1. Issued July 6, 1909. 
No. 12. The Hessian fly (Cecidomyia destructor Say). By C. L. Marlatt. pp.4. July 
26, 1895. 
Same, revised edition. pp. 4. April 13, 1900. (Superseded by No. 70.) 
No. 18. Mosquitoes and fleas. By L. O. Howard. pp. 4. February 1, 1896. 
Same, revised edition. November 15, 1897. 
No. 14. (Revision of No. 6.) The Mexican cotton-boll weevil (Anthonomus grandis 
Boh.). By L. O. Howard. pp. 8, figs.5. February 12, 1896. 
Same, Spanish edition. pp. 8, figs. 5. May 18, 1896. 
No. 15. General work against insects which defoliate shade trees in cities and towns. 
By L. O. Howard. pp. 4. March 6, 1896. (In advance from an article entitled 
“The shade-tree insect problem in the eastern United States,’’ to be published in 
the Yearbook of the department for 1895.). 
No. 16. The larger corn stalk-borer (Diatrxa saccharalis Fab.). By L. O. Howard. 
pp. 3, figs. 3. August 13, 1896. 
No. 17. The peach-tree borer (Sannina exitiosa Say). By C. L. Marlatt. pp. 4, fig. 1. 
September 30, 1896. (Superseded by No. 54.) 
No. 18. (Revision of No. 14.) The Mexican cotton-boll weevil (Anthonomus grandis 
Boh.). By L.O. Howard. pp. 8, figs. 5. February 4, 1897. 
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