Per MPG
here: "The Acontia areli group consists of six species, five of which are found in our check list area. They are similar in appearance, but differ in genitalia..."
Bob Patterson notes on his tentative ID
here: "... based on the large trapezoidal white spot on costal margin..." For more info see PDF under "Review of the Acontia areli group..." at ZooKeys 9 (2009) Special Issue
(1).