Madoryx pseudothyreus, the false-windowed sphinx, is a moth of the family Sphingidae.

It is known from the tip of Florida down to Cuba and the surrounding West Indies.

There is a small olive-green basal patch on the forewing upperside which is separated into two spots.

Adults feed on the nectar of various flowers, including Asystasia gangetica.

Pupation takes place in cocoons spun amongst leaf litter.