24 - 25.5 cm. 170 g. Bill slender and pointed, black. Area around the eye white, thin and discontinuous. Sides of face and underparts white. Flanks gray. Forehead, crown, nape and upperparts (including wings), blackish gray. Underwings white, gray edgings. Legs gray. Southern individuals (S. hypoleucus hypoleucus) have white on area around the eye, and area between the bill and eyes. Northern individuals (S. hypoleucus scrippsi) have blackish area around the eye with a eye-crescents inconspicuous. Males and females are similar. Juveniles are similar to adults.