Escher's blue is well marked on the underside, but lacks the cell spot
of
the common blue. The upperside of the male is distinctive on close
examination.
The dark marginal border is narrow and the outer edge of the hindwing
is
slightly wavy, with half chequering usually visible. There are also
usually fine pale lines
visible around the cell of the forewing, often resembling a set of
antlers.
