R.K. Selander, 1954 C. brunneicapillus 2 7 mi. E Querétaro, 5970 ft., Querétaro, México March 14 not to be concerned with the presence of the truck about 40 feet or less from his position. It sang with bill pointed upward at an angle. Bonnie described a soft sound made by the wren between the land "gua-gua-gua-gua" song. The throat is puffed out when the bird sings. I watched this same bird sing from the top of a tuna (±12 feet) - the tail was held only slightly below the horizontal as the bill was pointed upward only slightly. - I should judge that there was a pair of wrens every 30 or 40 gds apart in the stand of cactus. They were quite many although not so much as more birds of this species observed in Baja Calif. in February, 1953. In flight the white tips of the tail are conspicuous, especially when the bird swoops up to alight on a cactus. The calls heard today were a bit higher pitched than calls of conen' or longanti I believe but the difference is slight if it exists at all. The only sounds heard from wrens today were the "gua-gua gua" call - given with an increase in tempo at the end of a series. Flights were short and always just a few feet above the ground. The birds tended more or less to remain together in pairs, even when disturbed? Other birds noted associated with the cactus, wrens were Pipilo fuscus, mockingbird, house finch, mourning dove, dark sparrow, and Vermillion flycatcher. In skimming the 4 birds I noted that one, which