. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 51. -The Black Hills beetle (Dendroctonus ponderosae): a, Adult; b, larva; c, pupa, a, Greatly enlarged; b, c, less enlarged. (Author's illustrations.) excavate new ones in the remaining living bark on the dying trees and deposit eggs. The overwintered broods of young adults begin to emerge from the trees by the middle of July, but the main swarm does not appear until the last of July and first of August. Some of the retarded broods continue to come out until October, or later. The broods of larvae begin to
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. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 51. -The Black Hills beetle (Dendroctonus ponderosae): a, Adult; b, larva; c, pupa, a, Greatly enlarged; b, c, less enlarged. (Author's illustrations.) excavate new ones in the remaining living bark on the dying trees and deposit eggs. The overwintered broods of young adults begin to emerge from the trees by the middle of July, but the main swarm does not appear until the last of July and first of August. Some of the retarded broods continue to come out until October, or later. The broods of larvae begin to transform to pupae and adults about the middle of May, and continue to do so during the period from June until September, or later, and begin to emerge in August.. 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 work.. United States. Bureau of Entomology. Washington : G. P. O.