The name Smerinthus is apparently derived from the Greek feminine noun 'Merinthos', but has been Latinised with the masculine -us ending and is thus, according to the ICZN article 30.1.3, masculine.
Smerinthus appears to originate from the Greek feminine noun 'Merinthos'; however, it has been Latinized with a masculine -us ending, making it masculine under ICZN rule 30.1.3.