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A Key To Differentiate Nymphal Stages Of Melanoplus Differentialis (Thomas) From Those Of Melanoplus Bivittatus (Say), (Orthoptera); Also, Descriptions Of Instars And A Key For Identification Of Nymphal Stages Of These Two Species, Gerald Bishop Spawn
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During the past few years South Dakota and neighboring states have been confronted with serious outbreaks of locusts. Whole crops of small grain and corn have been destroyed by the voracious insect hordes which at times left only bare ground where once had stood waving fields of grain. Chief among the aggressors have been the two species, Melanoplus differentialis (Thomas), the Differential Locust, and Melanoplus bivittatus (Say), the Two-Striped Locust. The contents of this paper include studies of these two species.