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1.         Case (6 mm) curved, constructed of sand; head pale yellow to light brown, with bold, regular             muscle scar pattern of dark spots posterior to eyes. Rare. . . . . . . . . . .Micrasema rusticum

           Case straight, constructed of strips of plant materials wound around the circumference; head             pattern with irregular or mottled appearance, lacking pattern of muscle scars. Rare. . . . . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Micrasema wataga