DARK-BASED GLIDING HAWKMOTH

Wingspan: 96--120mm. In both male and female, this species is easily distinguished from other species of Ambulyx by the large black or tawny basal patch of the hindwing upperside. Dorsal line of abdomen distinct, but not dilated to a patch on eighth tergite. The costal sub-basal spot on forewing upperside usually absent, but sometimes nearly as large as the one behind cell. Fore-tibia with spines at end (Bell & Scott, 1937).