On the Identity of the Spotted Alfalfa Aphid in North America1

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Abstract
The spotted alfalfa aphid should be known by the name Therioaphis maculata (Buckton), cotypes of which arc well within the range of normal geographical variation of this Medicago-inhabiting species. There is considerable variation in the species as it occurs in the Old World, but very little in North America, where it seems identical with population samples received from Israel, Cyprus, and Morocco. Two characters, the proportion of the third antennal segment covered by sensoria and the size of the ventral sclerotized abdominal dashes, were found of particular value in characterizing local populations and in distinguishing populations and specimens of T. maculata from those of the yellow clover aphid. T. trifolii (Monell). Both these species of Therioaphis belong in the subgenus Pterocallidium.

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