Appearance
The wingspan is 87–97 mm. It can be distinguished from all other ''Eumorpha'' species by the hindwing upperside being almost uniformly pale pink from the base to the diffuse, dark brown submarginal band.Adults are on wing from June to August in one generation in the northern part of the range. There are two generations with adults on wing from May to August in the south. Adults feed on the nectar of various flowers, including ''Lonicera japonica'', ''Petunia'' × ''hybrida'', ''Philadelphus coronarius'', and ''Phlox'' species. It is one of three main pollinators of the rare orchid ''Platanthera praeclara''.
Larvae are of three forms: light green, reddish orange, and tan to brown. They are known to feed on ''Parthenocissus quinquefolia'' and ''Ampelopsis'' species. They are often found on wild and cultivated Vitaceae, including grapes, and they can sometimes be found in vineyards feeding on the leaves.
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