Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . ewe would name the spiny spruce bark-borer, Its habits and minesare apparently like those of the foregoing species, but the mines area little larger, as is the beetle itself. We noticed the beetles in greatnumbers with several pupie under the bark of the spruce at Brunswick,August 22, and under another tree, observed August 27, there weremany pupse, and numerous pale beetles which had only recently cast offtheir pupal skins. There we
Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . ewe would name the spiny spruce bark-borer, Its habits and minesare apparently like those of the foregoing species, but the mines area little larger, as is the beetle itself. We noticed the beetles in greatnumbers with several pupie under the bark of the spruce at Brunswick,August 22, and under another tree, observed August 27, there weremany pupse, and numerous pale beetles which had only recently cast offtheir pupal skins. There were all stages between very pale beetles andthe dark, black-brown fully mature beetles; some with a short, broaddark stripe on each wing-cover; this might be thought at first sight a SPRUCE BARK-BEETLES. 825 different species, and indeed it is probable that from variations in age^and size, too many species of these bark-borers have been described. Leconte states that the genus Xyleborus has the body stout, cylin-drical ; declivity of elytra oblique, scarcely flattened; funicle of an-tennae with four distinct joints j tibiae finely serrate on the discal half. CL
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