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.
The name Smerinthus is thought to be derived from the Greek feminine noun 'Merinthos', and despite being Latinized with a masculine -us ending, it is classified as masculine according to ICZN article 30.1.3.