Abstract
A distinct difference was found between D. ponderosae Hopkins (= monticolae Hopkins) and D. ponderosae (= jeffreyi Hopkins) in their reaction to pine resin vapors and their individual components. Practically no difference was found between 2 different host sources of D. ponderosae (:= monticolae ). Therefore, the author recognizes a biological difference between D. ponderosae (= monticolae ) and D. ponderosae (= jeffreyi ) and recommends continuing to distinguish between them.
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