Hylocharis leucotis Oct. 22 El Batel, 5100 feet, Sinaloa. Common, generally distributed where there are low thickets including plants in flower, but particularly abundant along streams and draws. I have paid particular attention to this "colonial" species of skutch! and cannot say that they differ in behavior in any important respect from Calyptra. Of course, at this post-breeding time, the question of coloniality cannot be settled. Like Calyptra, there are repeated dashes, chases, with much chattering, indicating a strong intolerance among individuals. Adult males have been observed to sing after chases. The song is weak, and much more insect-like than in Calyptra; it consists of alternately given three or four times, and ended with three or four sharply upturned squeaks and a chatter. Sometimes the upturned squeaks are omitted. Chips or chatters are given more or less continuously during feeding. The adult males, although singing and occupying prominent posts do not hold to them as definitely as Calyptra does. But that the adults are locally established is clearly indicated by the fact that certain individuals appear to remain in one area and are seen repeatedly. Some local shifting undoubtedly occurs, however; Leopold collected an adult male in camp on Oct. 20, and