Abstract
Comparisons of fore wings from 27 separate populations of 13 species ofAphelinus, Mesidia, andMesidiopsis revealed that the portion of the wing posterior to the major veins is divided into 8 setal regions (the subcostal cell constitutes a 9th). Each species has a characteristic number and/or placement of setae within each region. In some species the interpopulation variability is quite small, butEphelinus asychis Walker shows large variations associated with the species of host aphid attacted; individuals reared fromTherioaphis trijolii (Monell) are hairier in several regions than those reared fromMyzus persicae (Sulzer). A nomenclature for setae in the various wing regions is proposed.
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