Range.—Breeds from Lower Rio Grande in Texas south to southern Brazil.
Page [253]. After No. 496 (which has become Tangavius æneus involucratus) add: 496a. Bronzed Cowbird (T. w. æneus). Similar to T. æ. involucratus but plumage of the male smoother and more glossy; the female much grayer, more like female of M. ater.
Range.—"San Antonio, Texas, south through eastern Mexico, Yucatan and central America to Panama" (A. O. U.).
The Range of No. 496 is hence restricted to the region from northwestern Mexico to southern Arizona.
Page [255]. After No. 488a. add: 488b. Western Crow (C. b. hesperis). Similar to No. 488 "but decidedly smaller, with bill relatively smaller and more slender." ♂ W. 11.88; T. 6.72; B. 1.87; depth of B. at nostril .62 (Ridgway).
Range.—"Western North America, from east central British Columbia and Montana south to southern California, Arizona, and western Texas" (A. O. U.).
APPENDIX II.
FAUNAL BIBLIOGRAPHY
When one is engaged in a study of the birds of a certain region or locality it is of the first importance to learn what has been published about them by previous workers. Such information may appear in general works on the bird-life of a large area, but more frequently it is found in 'local lists' of the birds of a limited district. These lists constitute one of the most characteristic and numerous types of ornithological publication. They are of value to the student of distribution and migration, in the broader phases of these subjects, and they are of especial interest and assistance to students living in the region to which they relate.