Only one specimen was seen at Triunfo during the last two weeks of June, but the bird was common and presumably breeding at Pierce’s Ranch in July. At the latter place it fairly swarmed in December, the resident colony being probably augmented by large numbers of winter visitors from La Laguna, where Mr. Frazar found only a few birds lingering in late November and early December. Along the road between San José del Cabo and Miraflores it was seen in considerable numbers on November 15, and three were observed in some evergreen oaks at Santiago on November 23. _Nesting._--There is a set of four eggs in the Thayer collection, apparently the same set referred to by Mr. Brewster, collected by M. Abbott Frazar in the Sierra de la Laguna, on June 3, 1887; the nest is described as 10 feet up in a dead pine stump; the entrance measured 1¾ inches in diameter, and the cavity was 18 inches deep. The measurements of these 4 eggs are =24.13= by 19.05, 22.61 by =19.56=, =22.61= by 19.30, and 23.88 by =18.80= millimeters. The food and general habits of this woodpecker do not seem to differ materially from those of the species elsewhere. It has similar acorn-storing habits, for Mr. Frazar found “many dead pines literally stuffed full of acorns.” BALANOSPHYRA FORMICIVORA ACULEATA (Mearns) MEARNS’S WOODPECKER PLATE 28 HABITS Along our southwestern border, from Arizona, New Mexico, and western Texas southward over northwestern Mexico to Durango, we find this race of ant-eating woodpecker. It was separated, named, and described by Dr. Edgar A. Mearns (1890a) as follows: “General size and coloring intermediate between _M. formicivorus_ and M. _formicivorus bairdi_; throat less yellow than in either of them; bill shorter, more slender, and less arcuate than in either of the other forms of M. formicivorus; white striping of chest more than in the Pacific coast form, less than in _formicivorus_.” He says of its haunts (1890b): “A very common resident through the pine belt, breeding plentifully. I have found it as high as the spruce forests, but never in them. It is essentially a bird of the pines, only occasionally descending to the cottonwoods of the low valleys. The oaks which are scattered through the lower pine zone supply a large share of its food.” Henry W. Henshaw (1875) writes: “This woodpecker was first observed when we neared Camp Apache, and, so far as my own observations go, its range in Arizona is coincident with that of the oaks, the acorns of which appear to constitute a very important item in its bill of fare. We noticed it to the southward in every locality where oaks were found in sufficiently large groves to afford it at once a place of shelter and an inexhaustible source whence to draw food.”