Dr. Cooper has met with this species in February near San Diego, but not on the Colorado. They seem to prefer the evergreen-oak groves toward the middle of the State, but are not found in the higher Sierra Nevada. They are residents throughout the year in the evergreen oaks near San Francisco. He adds that they are seen in small parties, scattered about the trees, and calling to each other with a variety of sweet and loud notes, some of which are said to equal those of our best singers. It also has certain powers of imitation like the Eastern crested species and the same cry of _pēto-pēto_. It feeds on acorns as well as insects, and often goes to the ground in search of them. It cracks the acorns with its bill, and hammers at bark and decayed wood with the industry of a woodpecker. Mr. Ridgway met with this species among the pines of the eastern slope of the Sierra Nevada, but nowhere in abundance. Among the cedars it was almost the only bird seen. He describes its manners as greatly resembling those of the other species. Its notes, though differing from those of the Eastern _L. bicolor_, being weaker and less distinct, retain its vehement and characteristic manner of utterance. Lophophanes wollweberi, BONAP. WOLLWEBER’S TITMOUSE; STRIPED-HEADED TITMOUSE. _Lophophanes wollweberi_, BON. C. R. XXXI, Sept. 1850, 478.— WESTERMANN, Bijdr. Dierkunde, III, 1851, 15, plate.—BAIRD, Birds N. Am. 1858, 386, pl. liii, fig. 1; Review, 79.—SCLATER, P. Z. S. 1858, 299 (Oaxaca, high lands).—IB. Catal. 1861, 14, no. 89.—COOPER, Birds Cal. 1, 43. _Parus annexus_, CASSIN, Pr. A. N. Sc. V, Oct. 1850, 103, pl. i. _Lophophanes galeatus_, CABANIS, Mus. Hein. 1850, 1851, 90. SP. CHAR. Central portion of crest ash, encircled by black, commencing as a frontal band, and passing over the eye. Chin, throat, and a line from behind the eye and curving round the auriculars to the throat (bordered behind by white), as also some occipital feathers, black. A white line from above the eye margining the crest, with the cheeks below the eye and under parts generally white. A black half-collar on the nape. Upper parts of body ashy. Length, about 4.50; wing, 2.50. HAB. Southern Rocky Mountains of United States, and along table-lands through Mexico, to Oaxaca (high regions, SCLATER). Orizaba (Alpine regions, SUM.). HABITS. Wollweber’s Titmouse, so far as its distribution is known, is a bird of Western Texas, the high table-lands of Mexico, and of the whole of New Mexico. It was described by Bonaparte and by Cassin nearly simultaneously, in 1850. It bears a very close resemblance to the _Lophophanes cristatus_ of Europe.