Arnold, Steven 1965 17 June (Emi. E. Matamoros, Coahuila, Mexico (11:30AM - 1:45PM) Stopped 1mi. W of one of Zweifels Uua exul localities. Uua quite abundant; ~30 siguted of which 15 shot (.22 dust shot) + 2 rooted. U. exul holds tail well above ground while running; curled slightly upward. The 1st one I shot I thought was a Callisaurus until after it was hit; when it stopped running (sub-adult) curled its tail upward + slightly askew, Callisaurus style. One mile was observed before being flushed. Came walking out from under a sm. shrub on to hard-pau some-what stiff legged w/ tail held @ 30° angle, gently curved. The red-orange color of the upper eyelid + rostal region was very conspicuous. Several times, 3 or 4 Uua were flushed simultaneously. One would be chased to a distinct mesquite (?) flushing yet further + so on until we were trying to keep track of 3or 4 critters. Territory violations? Of seven stomachs some examined, lg. red ants = primary food item. Locality consists of fine wind blown dunes 1' to 6' high interspaced w/ caked mud-clay hardpan. mesquites(?) = predominant plant + primary refuge