R. K. Selander, 1954 C. jocosus 10 mi. SE Acatlan, ±3980 ft., Puebla, México March 16 A flock of ±6-10 birds crossed the highway as we stopped to take a picture of an agave in bloom. The birds came from a rather steep slope, crossed the road and went up an arroyo. They appeared to be moving in a loose formation. Calls were given frequently—a fast “cha-cha-cha-cha”—something like a high pitched C. brunneicapillus. They flew through the higher parts of the [illegible] trees and onto the larger candleabra cacti; I attempted to follow the flock but lost it before getting a chance to collect specimens. Apparently, the breeding season hasn’t started. We noted a nest placed about ±7 feet above the ground in a thorny brush. The nest was old and lacked a lining but it probably was that of Cactus wren. Along the road in the cactus forest we noted several other nests of the size and shape of a cactus wren’s nest.