Macroglossum alenuska
Similar to Macroglossum vicinum piepersi but: forewing upperside antemedial band straight (curved outwards in Macroglossum vicinum piepersi); lighter areas of forewing upperside with whiter scaling rendering those areas somewhat silvery in appearance); underside of thorax darker grey; underside of abdomen overall chestnut brown, lacking the lateral bright reddish patches of Macroglossum vicinum piepersi.
Male genitalia: Very similar to Macroglossum vicinum piepersi but: upper edge of harpe gently upcurved (sharply upcurved at a right angle in Macroglossum vicinum piepersi); transverse apical process of phallus short and apically rounded; longer cornutus very long and thin (as in Macroglossum troglodytus); shorter cornutus lacking an apical rounded extension, rather it is triangular and bluntly pointed.