132 Aimophila carpalis Nov. 1 Pitahaya, 40 km. SE Empalme, 100 feet, Sonora a few inches away. The male parent is in an early stage of molt; both wings and tail contain new and old feathers. The gonads were exceptionally large, 5.5 mm. Of the pair prepared as skeletons, the female had not begun to molt. The male had begun to molt on the wings; his testes were 3.5 mm. long. Another observation pointing to the local residency of this species is the fact that the members of a pair seem attached to a particular area; when one is collected, the other remains nearby. In Sonora, van Rossem (1945: 274) doubts breeding of this species in the southern part of its range; he points out that there is a complete absence records between June 22 and Nov. 5, and that specimens taken in May and June were only in the beginning of sexual activity and were in stages of preuptual molt.