. Bulletin - Biological Survey. Zoology, Economic. SPECIES. 89 other insects that were running over the tree trunks. In that time one bird seized an ant and the other snapped at some flying- insect. One drank sap from the drills 30 and the other 41 times. Later in the da}^ one drilled 2 new holes and the other .5. The holes were made in more or less regular rings about the trunk, one ring close above another, for a distance of 6 to 8 inches. The drills were about a quarter of an inch deep, and penetrated the bark and the outer part of the Please note that these images are extracted from
. Bulletin - Biological Survey. Zoology, Economic. SPECIES. 89 other insects that were running over the tree trunks. In that time one bird seized an ant and the other snapped at some flying- insect. One drank sap from the drills 30 and the other 41 times. Later in the da}^ one drilled 2 new holes and the other .5. The holes were made in more or less regular rings about the trunk, one ring close above another, for a distance of 6 to 8 inches. The drills were about a quarter of an inch deep, and penetrated the bark and the outer part of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Biological Survey. Washington : Govt. print. off.
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