<div class="description">
<dl><dd>Circular No. 61</dd>
<dd>"May 24, 1905."</dd>
<dd>At head of title: U.S. Department of Agriculture, Bureau of Entomology</dd>
<dd>Economic importance. pp. 1</dd>
<dd>Historical. pp. 2</dd>
<dd>Life history and habits of the hemlock bark maggot. pp. 4</dd>
<dd>Description of the stages. pp. 5</dd>
<dd>Habits of the larva. pp. 6</dd>
<dd>Natural enemies. pp. 7</dd>
<dd>Associates -- Methods of preventing losses -- Bark maggots in other trees -- The lowland fir bark maggot. pp. 8</dd>
<dd>The alpine fir bark maggot -- The Sitka spruce bark maggot -- The Yellow pine fir bark maggot -- Conclusions. pp. 9</dd></dl><br>Subjects: Cheilosia; Wood borers; Western hemlock Diseases and pests</div>
<div class="fn value">
<dl><dd>Burke, H. E. (Harry Eugene), 1878-1963</dd>
<dd>United States. Bureau of Entomology</dd>
<dd>United States. Dept. of Agriculture</dd></dl></div>
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