254 



ZOOLOGY BIRDS. 



molting, renders this supposition very probable. I did not see them north 

 of the Gila, but from this river southward to the Mexican border their dif- 

 fusion is quite general. It is probable some pass the winter within our bor- 

 ders. From Mr. Aiken's investigations in Colorado, it would appear the 

 species occurs there as a spring and fall migrant, but apparently is not at 

 those seasons very numerous. A specimen was taken by him August 22 

 near the Rio Grande River, Colorado. 



The following measurements, taken from fresh specimens, were selected 

 from a series of over thirty. 



PASSEECULUS SAVANNA (Wils.), var. ALAUDINUS, Bp. 

 Western Savanna Sparrow. 



Passerculm alauclinus, BP., Comp. Eend., xxxvii, Dec., 1853, 918 (California). BD., 

 Birds N. A., 1858, 44G. XANTUS, Proc. Acad. Nat. Sci. Phila., 1859, 

 191 (Fort Tejou, Cal.). BD., U. S. & Mex. Bound. Surv., ii, pt. ii, 1859, 

 Birds, 14. HEERM., P. R. R. Rep., x, pt. iv, 1859, 49. COOP. & STICKL., 

 P. R. R. Rep., xii,pt.ii, 1800, 199. COOPER, Birds Cal., i, 1870, 181. STEV., 

 U. S. Geol. Surv. Terr., 1870, 404. SNOW, Birds Kan., 187t!, 10. MKURIAM. 



