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Bark Beetles of the Genus Hylastes Erichson in North America

Maulsby Willett Blackman

出版	U.S. Department of Agriculture, 1941
URL	http://books.google.com.hk/books?id=abAoAAAAYAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

The genus Hylastes Erichson occurs throughout the continent of North America from Alaska and Central America and from the Atlantic coast to the Pacific coast. This publication is concerned with the forms found north of Mexico. Coniferous forests in every region of the United States contain one or several species of Hylastes. Most of the species of the genus favor the pines as hosts, but some spruces are also attacked, as well as Douglas fir and to a less extent the true firs.