. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 12 top of the tree, and excavates three or four long lonsfitudinal galleries from a .single entrance and broad central chamber (PI. II). The cen- tral chambers and galleries are usually grooved in the surface of the wood, but can ])e readily distinguished from those made by the Oregon Tomicus. It is a common and widely distributed species over the greater part of the pine-producing areas of the United States from the Atlantic coast to and including the Rocky Mountain ; It attacks all of the P]astern a
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 12 top of the tree, and excavates three or four long lonsfitudinal galleries from a .single entrance and broad central chamber (PI. II). The cen- tral chambers and galleries are usually grooved in the surface of the wood, but can ])e readily distinguished from those made by the Oregon Tomicus. It is a common and widely distributed species over the greater part of the pine-producing areas of the United States from the Atlantic coast to and including the Rocky Mountain ; It attacks all of the P]astern and Southern pines, and doubtless several of the Western pines in addition to the rock pine, in which it was found in large numbers in the Black Hills region. The wood - engraving Tomicus {Toniiciis ccela- tus Eichh.).—This is a much smaller and more slender bark beetle than the two preceding spe- cies. Individuals vary in length from mm. to mm., and in color from dark red to dull black. This is also a common, widely distrib- uted, and variable spe- cies. It extends from the Atlantic to the Pa- cific, and infests all of the Eastern and South- ern pines and^spruces. A variety (var. scojndorum n. var.) was found in the rock pine of the Black Fig. 4.—Work of the Oregon Tomicus. Primary galleries en- IIllls, and haS been COl- graved in surface of wood. Central chamber extending into l^i^.^pfj ])\' ^Jjg writer f rOlU wood. Reduced about one-half (original). ' , , a number ot other spe- cies of Western pines. It attacks and breeds in the inner ]>ark on the roots, trunks, and branches of weakened and dying standing trees of all ages and sizes, from the very 3'oung to the oldest and largest. It also breeds in immense numbers in the stumps, logs, and tops of recently felled trees. T/ie darl'-red turpentine beetle {Dendroctonus vcdens Lee.)—This is the largest of the known North American bark beetles. The adults vary in lenofth from 6 mm. to mm. It attacks the bark on
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