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Color forms of Monocesta coryli (Say) in West Virginia (Coleoptera: Chrysomelidae)

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70 Volume 15, No.2, June, 2001, INSECTA MUNDI Color forms of Monocesta coryli (Say) in West Virginia (Coleoptera: Chrysomelidae) Monocesta coryli (Say) is rather widespread in the eastern United States. In life, the beetles are usually bright yellow with the basal and apical thirds of the elytra metallic blue. In pinned speci- mens, the yellow areas fade to pale tan. A number of years ago (Clark, 1986), I reported on an unusual color form that occurs in southern Ohio, the dark elytral markings being either entirely absent or very poorly developed. More recently (Clark, 2000), I stated that both forms occur in West Virginia, but I gave very little information regarding the distri- bution of each. Not surprisingly, the pale form occurs in areas of West Virginia that are near Ohio. Normal, darkly marked beetles are prevalent in more eastern and southern areas. The dividing line between the two forms roughly corresponds to the Allegheny Front and highest elevations in the state. Two disjunct records of the dark form, from Monongalia County, are from student collections, and they may have resulted from mislabeling (Linda Butler and S. Clark Haynes, personal communications). Very few intermediately colored specimens have been found. In only one instance, at Spruce Knob Lake in Randolph County, were both forms found together. Balsbaugh and Hays (1972) illustrated on the cover of "The Leaf Beetles of Alabama" a specimen with the distal marking well developed but with the basal marking only faintly indicated. Beyond this, atypical color forms in states other than Ohio and West Virginia have not been well documented. Figure 1. Monocestacoryli (Say); left, Renick (Greenbrier County); right, Hilton Village (Fayette County). pale form D both forms D no data Figure 2. Color forms of Monocesta coryli (Say), West Virginia distribution. Approximately 300 museum specimens were examined in connection with this in study. A com- pl

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