MUSEUM OF COMPARATIVE ZOOLOGY. 261 



11.* Polioptila cserulea Sclaler. Blue-gray Gnatcatcher. 

 Common. Generally seen in the same situations as It. calendula. 



VKRTDM. 



12.* Lophophanes bicolor Bonaparte. Crested Titmouse. 

 Common. 

 13.* Parus atricapillus Linne. Black-capped Titmouse. Chickadee. 

 Parus atricapillus Linne, Syst. Nat., I, 341, 1766. — Wilson, Am. Orn., I, 



137, 1808. — Bonaparte, Obs. Nom. Wils. Orn., Journ. Phil. Acad. Nat. 



Sci., IV, 254, 1825.— Rich. & Swain., Faun. Bor. Am., II, 226, 1831.— 



Audubon, Birds Am., II, 146, pi. cxxvi, 1841. — Cassin, 111. Birds Cal. 



I, 17, 1853. — Baird, Birds N. Am., 390, 1858. — Sclatek, Cat. Am. 



Birds, 13, 1862. —Baird, Rev. Am. Birds, I, 80, 1864. 

 Parus palustris Nuttall, Man. Orn., 241, 1832. 

 Parus carolinensis Audubon, Orn. Biog., II, 341, 1837 ; V, 474, pi. clx, 1839. — 



Audubon, Birds Am., II, 152, pi. cxxvii, 1841. — Cassin, 111. Birds Cal., I, 



17, 1853. — Baird, Birds N. Am., 392, 1858. — Sclater, Cat. Am. Birds, 



14, 1862. — Baird, Rev. Am. Birds, I, 81, 1864. 

 Parus septentrionalis Harris, Proc. Phil. Acad. Nat. Sci., II, 300, 1845. — 



Cassin, 111. Birds Cal., I, 17, 80, pi. xiv, 18"53. — Baird, Birds N. Am., 



389. — Sclater, Cat. Am. Birds, 14. — Baird, Rev. Am. Birds, I, 82. 

 Parus meridionalis Sclater, Proc. Lond. Zool. Soc, 1856, 293. — Baird, Birds 



N. Am., 392. — Sclater, Cat. Am. Birds, 14. — Baird, Rev. Am. Birds, 



1,81. 

 Parus occidental^ Baird, Birds N. Am., 391, 1858. — Sclater, Cat. Am. 



Birds, 14, 1862. — Baird, Rev. Am. Birds, I, 81, 1864. 

 Po:cila atricapilla Bonap., Consp. Av., 230, 1850. 

 Pacila carolinensis Bonap., Ibid. 



Seen by Mr. Marcy at Jacksonville, where also specimens of it were 

 collected by Mr. Maynard. Not observed by any of us up the river. 

 Audubon speaks of having found it abundant in the Floridas in the 

 winter of 1831 and 1832, and "breeding in the swamps as early as the 

 middle of February." * 



The common titmouse (P. atricapillus), although not more subject to 

 geographical variation than many other birds, is one of the species in 

 which such differences were first detected, though not recognized at the 

 time as such. Audubon, in 1833, upon returning to Charleston, South 

 Carolina, from a visit to the Eastern States, the British Provinces, and 

 Labrador, noticed a considerable difference in size between the examples 

 of this bird he met with at the North, and those of the lowlands of the 



* Birds of America, Vol. II, p. 153. 



