Abstract
An apterous viviparous female of a new aphid species Uroleucon (Uroleucon) bulgaricum sp. n. is described and compared with the similar species U. (Uroleucon) achilleae (Koch, 1865). The new species was collected by the late J. Holman in the Blagoevgrad region (SE Bulgaria), where it is associated with Achillea coarctata Poiret in Lam. (Asteraceae). The similarities and differences between other Achillea-feeding Uroleucon species are discussed. A morphological key to the species of the subgenus Uroleucon Mordvilko, 1914 in Bulgaria is presented. A modified key to the Achillea-feeding Uroleucon aphids of Blackman and Eastop is also provided.
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