Sphinx constricta Butler, 1885, Cist. Ent. 3: 113. Type locality: Japan, [Honshu, Kanagawa,] Kashiwagi [Kashiwagaya].
Structurally similar to Sphinx ligustri, but forewings more elongate and angular; pattern similar, but the pink colour less intense. Hindwing upperside with antemedian and median pale bands connected at costal and inner margins, a situation rare in Sphinx ligustri; the bands much less pink.
Japan: 28.iv-2.vi (Hokkaido); 6.vi-12.viii (Honshu); 20.vii-20.viii (Hokkaido).
LARVA: The anal horn in full-grown larvae of this species in totally black and granular. In Sphinx ligustri Linnaeus, 1758 it is yellow and black, more robust, and smooth.
Larval hostplants. Enkianthus perulatus, Helwingia japonica, Ilex crenata, I. macropoda, Rhododendron, Spiraea salicifolia, S. thunbergii, Viburnum dilatatum and Weigela hortensis.
Tachinidae: Winthemia cruentata (Rondani).
Japan: Hokkaido (Hakodate; Oshamanbe); Honshu (Sado Island; Kashiwagaya; Shiratani-yama; Onoba; Fujimi Heights; Shimashima Valley; Bushi); Kyushu.
Endemic to Japan, south of southern Hokkaido (Komatsu & Inoko, 2000).
In central and northern Hokkaido, Japan, this species is replaced by Sphinx ligustri.