Abstract
Two publications dealing with the seasonal development of species of Conophthorus have appeared in recent years. Lyons (1956) reported on a study of C. resinosae Hopk. in red pine, Pinus resinosa Ait., in Ontario, whereas Ruckes (1958) gave the details of his observations on C. radiatae Hopk. in Monterey pine, Pinus radiata D. Don, in California. Both species attack the developing cones of the host tree, although Lyons found that C. resinosae would develop in the shoots of red pine, and occasionally attacked the second-year cones of jack pine as well. The jack pine-inhabiting species, however, has been found almost exclusively in the shoots; only seven second-year cones that had been mined were collectcd during two years of investigation.
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