♀.— Length nearly 19 mm.; length of anterior wing about 13 mm.; breadth of abdomen in middle 7 mm.; in all respects like M. Comanche, Cresson (co-type compared), except as folllows: Abdomen broader; fourth segment without a bare median area, the braod grayish-white band continued right across; fifth and sixth segments with the hari purplish-black, except the long hair at sides, which is paler and redder; hair of venter not so red; hair of inner side of basal joint of hind tarsi reddish-black, ferruginous basally: wings hardly so dark; hair-patch on mesothorax shorter, so that it is conspicuously broader than long; flagellum dark, with only a faint red tinge beneath; hair on outer side of basal joint of middle tarsi brownish-black (rufo-fulvous in Comanche).