Acanthosphinx

Acanthosphinx is a monotypic(meaning it only has one subclass) genus of moth. It is in the family Sphingidae. It was erected by Per Olof Christopher Aurivillius in 1891. 
It has one species, which is Acanthosphinx guessfeldti, the widow sphinx. It was described by Hermann Dewitz in 1879. It is seen in forests in Sierra Leone to the Congo, Angola, Zambia, Malawi, Tanzania and Uganda.
Each forewing is 57–70 mm in length.
The larvae eat "Bridelia micrantha".