The common A. unicolor can be distinguished by its smaller size, greyish white ground colour ,and that on the hindwing postdiscal spot 6 is blotchy & lies further inside spot 7.

Notice here the postdiscal series of spots on the forewing is dislocated, & what can be seen are 2 semi-vertical large spots 2 & 3, and three small spots 4, 5, & 6 in a slant. (dislocation at vein 4 ; note twin dark lines are fold-lines in the middle of each space. )

In A. leogoron the dislocation is very marked, with spot 3 shifted well in so that there is a big gap between spot 3 & 4. Also, the width of the space between spot 3 & the termen is at least twice that between spot 2 & the termen.

The ground colour of A. horsfieldi is pale buff; more discernable on the hindwing.That of A. leogoron is greyish white.

Lastly the male of A horsfieldi have five noticeable teeth on the hindwing (note lowermost broken here), while A. leogoron male have only three discernable teeth.

Two other species of similar size and with a dislocated series of postdiscal spots on the forewing, A. strigatus & A. sarrastes can be dismissed by their postdiscal spot 6 on the hindwing being outside of spot 7.