R. K. Selander, 1952 Compylorhynchus jocosus gularis July 26 Rio Mitjatitan, 4000 ft., 20 mi. N! Atotonilco, Ndecalgo, Mexico. a willow tree; noted another similar nest in a mesquite tree, about 15 feet above the ground: These nests may belong to C. jocosus gularis. The young are out of the nests; frequently seen; some collected. These worms are much less wary than C. brunneiceps. They are frequently encountered in pairs or groups of 3 or 4. The young are going about with the adults. No signs of territoriality, although there is a tendency for a given flock to remain in a certain general area. They are never found high above the ground, nor on the ground; most frequently found in small trees or limbs from 3 to 20 feet above the ground. Less interested in imitation of their note than C. brunneiceps, less inquisitive, although my squealing usually excites them to calling and increased activity. Most frequently heard in the early morning, becoming quiet after about 11:00. Their notes are more noisal than those of C. brunneiceps; a nasal "che - che - che - che" or "chew - chew - chew", much less clear and less resonant, although there are many similarities between the two. Often give a short call "che-che-che" ... "che-che", accenting the first "che". Again the call may be given ... "che (short) che-che -- che - che- che--che-che-che-che." The young give the same call as the adults, but it is noticeably weaker and at