H.Wolf (1963 Amphila humeralis August 7 9 mi. E. Guanajuato, Morelos, Canyon de Lobos. At drier (east) end of canyon, this species was fairly common in dense shrubby growth on hillside. Generally fawn pairs together, but when squawking to attract them four plus would often be in same shrub. Heard both lone birds & apparently 2 birds chattering. Chattering is less harsh than A. vireoides. Birds taken (4) appeared in new body plumage & one was in light body molt. Every bird with hood patch looked as if just beginning to enlarge. According to Rowley (Landa, 1962) the species should be nesting & some may have young. August 6 11 mi. E. Guanajuato, Morelos, Mexico When road leads out of Canyon de Lobos A. ruficanda becomes more common. Stopped to collect ruficanda & found humeralis in the flat land. There were at least three birds - all seen were adults. Humeralis stuck to thicker vegetation generally than did ruficanda but there was some interchange. Song heard of humeralis is one or two two-part introductory notes followed by a dry trill. August 7 9 mi. SE. Iguana de Matamoros, Puebla, Mexico #2192 central + back molt *1 rectrices shattered at base.