Abstract
This study treats the 15 species of the leaf hopper genus Graminella DeLong known to occur in the United States. G. nigrifrons (Forbes), the commonest and most widespread species, is of special interest because plant pathologists have shown it to be an effective vector of a corn stunt virus. Two Neotropical species, G. cognita Caldwell and G. puncticeps Linnavuori, are recorded from the United States for the first time. The paper contains a key to species, illustrations of the diagnostic features, discussions of variation, new distributional data, and notes on plant associations. One species is removed from Graminella and reassigned with this combination: Deltocephalus nigrinotus (DeLong and Mohr).

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