New Celastrina from the eastern slope of Colorado, A
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Celastrina humulus (new species) is named and compared to related and sympatric Celastrina. It is univoltine, and usually sympatric with the univoltine Celastrina ladon sidara and barely overlaps the end of the sidara flight, as adults emerge from post-diapause pupae later than sidara. It has a different habitat, and a different host (most populations feed on male flowers of hop Humulus lupulus, but one set of populations feeds on Lupinus argenteus flower buds). Adults are whiter than sidara. Adults are electrophoretically most similar to the eastern Prunus serotina gall feeding host race, and ...