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(Economic literature.) 
1826. Harris, T. W.— Trees.<New England Farmer, Y, pp. 169-171, December 22. 
1836. Erichson, W. F. — Systematische auseinandersetzung der familie der borken- 
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1837. Kirby, Wm. — Fauna boreali Americana; or the zoology of the northern parts 
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1839. Ratzeburg, J. T. C— Die forst-insekten, Vol. I, p. 217, Berlin. 
1841. Harris, T. W. — A report on the insects of Massachusetts injurious to vegeta- 
tion, p. 72, Cambridge. 
1842. Harris, T. W. — A treatise on some of the insects of New England which are 
injurious to vegetation, pp. 72-73, Cambridge. 
1843. Mannerheim, G. G. — Beitrag zur kaefer-fauna der Aleutischen Inseln, Insel 
Sitka und Neu-Californiens.<Bul. Soc. Imp. Nat. Mosc, Tom. XVI, n, 
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1852. Harris, T. W. — A treatise on some of the insects of New England which are 
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1858. Fitch, Asa. — Fourth report on the noxious, beneficial, and other insects of 
the State of New York.<Trans. N. Y. State Agr. Soc, XVIII, pp. 781-854. 
1859. Le Conte, J. L. — Reports of explorations and surveys . . . from the Missis- 
sippi River to the Pacific Ocean. Report on insects collected on the survey, 
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1862. Harris, T. W. — A treatise on some of the insects injurious to vegetation, new 
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1863. Harris, T. W. — A treatise on some of the insects injurious to vegetation, Flint 
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1868. Le Conte, J. L. — Synopsis of the Scolytidse of America north of Mexico, 
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1868. Zimmermann, C. — Synopsis of the Scolytidae of America north of Mexico. < 
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1869. Chapuis, F.— Synopsis des Scolytides.<Mem. Soc. Roy. Sci. Liege, Author's 
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1871. Le Baron, W. — Means against larvae in timber; answers to correspondents. < 
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1876. Peck, C. N.— The black spruce. <Trans. Albany Institute, VIII, pp. 283-301. 
1876. Thomas, Cyrus.— Sixth report of the State Entomologist on the noxious and 
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1877. Smith, E. A.— Shade trees, indigenous shrubs and vines, by J. T. Stewart, 
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1877. Packard, A. S.— Report on the Rocky Mountain locust and other insects now 
injuring or likely to injure field and garden crops in the Western States and 
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