THE ARKANSAS KINGBIRD. 249 



had not been previously disturbed, which seems to indicate that they occasion- 

 ally may rear a second brood. 



The eggs of the Arkansas Kingbird do not differ in shape or coloration from 

 those of the Kingbird, and the same description will answer for both; but they 

 are a trifle smaller as a rule. 



The average measurement of one hundred and four eggs in the United 

 States National Museum collection is 23.62 by 17.42 millimetres, or about 0.93 

 by 0.69 inch. The largest egg of the series measures 25.91 by 18.54 millimetres, 

 or 1.02 by 0.73 inches; the smallest, 19.81 by 15.75 millimetres, or 0.78 by 0.62 

 inch. 



One of the type specimens, No. 20392 (PI. 1, Fig. 16), from a set of three 

 eggs, shows rather heavy and handsome markings, and also a slightly pinkish 

 ground color, while No. 20399 (PI. 1, Fig. 17), from a set of four (one of the 

 largest specimens in the series) represents about an average-marked egg; both 

 are from the Bendire collection; the former was taken at Fort Lapwai, Idaho, 

 June 16, 1871, and the latter at Fort Walla Walla, Washington, May 25, 1881. 



gi. Tyrannus vociferans Swainson. 



CASSIN'S KINGBIRD. 



Tyrannus vociferans Swainson, Quarterly Journal of Science, XX, 1S2C, 273. 

 (B 127, C 245, R 307, C 371, U 448.) 



Geographical range: Western United States; from the eastern slopes of the 

 Rocky Mountains west to California; north to southern Wyoming; south through Colo- 

 rado, Xew Mexico, northwestern Texas, Arizona, to Lower California, Mexico, and in winter 

 to Guatemala and Costa Rica. Accidental in Oregon. 



Cassin's Kingbird, while fairly common in certain sections of its range, 

 appears to be entirely absent in some of the intermediate regions. Eastward, so 

 far as is known at present, its breeding range extends to the eastern bases of the 

 Rocky Mountains in Colorado, and possibly to southeastern Wyoming, where 

 Dr. C. Hart Merriam obtained a single specimen on May 27, 1872, near Chey- 

 enne. In the Great Basin region, through Utah and Nevada to the eastern 

 slopes of the Sierra Nevadas in California, it has not yet been met with, but it 

 probably occurs in southern Utah; while in the coast districts of southern Cali- 

 fornia and through the greater portion of Arizona and New Mexico it is a 

 common summer resident, and it also probably breeds in limited numbers in 

 northwestern Texas. In Oregon it can only be considered as a straggler, though 

 Mr. A. W. Anthony observed a few specimens on May 5, 1885, in Washington 

 County, in the northwestern part of the State. While the Arkansas Kingbird 

 appears to shun the immediate coast districts, Cassin's Kingbird seems to prefer 

 them. It is said to be quite common in many parts of Mexico during the breed- 

 ing season, and in southern California it is partly resident. 



