Lesser Grass Blue

Male upperside. Pale violet-blue, with a silvery sheen in certain lights, fore wing: a broad brown edging along the termen, which covers in some specimens quite the outer fourth of the wing, while in others is much narrower. It is always broadest at the apex and is bounded by an anticiliary darker line, beyond which the cilia are brownish at base and white outwardly.

Hind wing: anterior or costal third to half and apex brown; a slender black anticiliary line, beyond which the cilia are as in the fore wing.

Please see link for more.
http://en.wikipedia.org/wiki/Zizina_otis