The two species are difficult to distinguish: A. fenestralis tends to be smaller and lighter in colouration when an adult. Both species have V-shaped markings on their abdomens, with A. fenestralis usually having two or three, and A. similis four.
Identifying the two species is challenging: A. fenestralis tends to be smaller and lighter in color when fully grown. Both species have V-shaped markings on their bellies, with A. fenestralis typically having two or three, while A. similis has four.