208 



XESTS AND EGGS OF 



almost confluent wreath at either end. The largest eggs in Mr. Norris' Cvtllection 

 measure 2.41x1.84, 2.37x2.00; the smallest, 2.17x1.80, 2.20x1.78. The average size is 



2 36x1.80. 



337(1. KRIDER'S HAWK. Buten borealis l-riderii Hoopes. Geog. Dist. — Great 

 Plains of the United States, from Minnesota to Texas. 



This lighter colored variety of the Red-tailed Hawk occurs in the Great Plains, 

 from Minnesota to Texas; east irregularly or casually to Iowa and Northern Illinois. 

 Mr. P. M. Dille writes that this bird nests in remote places on the plains and among 

 the large cliffs of Colorado. He was unable to detect any difference between the 

 nest and eggs of this bird and those of the Western Red-tail. He took a set of the 



eggs, three in number, in Weld county. 

 May 24, 1886, from a nest in a cottonwood 

 tree. Two of these specimens are slightly 

 spotted with Vandyke brown, but the 

 third is quite heavily splashed and 

 blotched at the smaller end with chestnut 

 and cinnamon; their sizes are 2.34x1.82, 

 2.30x1.84, 2.28x1.83. A set of three colected 

 by Mr. Dille is in my collection and offer 

 the following measurements: 2.40x1.90, 

 2.38x1.85, 2.30x1.89 inches. Mr. Dille states 

 that the nest contained cotton balls, from • 

 the tree In which it was placed; these had 

 burst and made excellent soft lining for 

 the nest. 



337(y. WESTERN RED-TAIL. Butco 

 hurcalis culiiriis (Cass.) Gf>og. Dv^^t.—West- 

 ern North America, especially in the 

 United States, from Rocky Mountains 

 to the Pacific, south into Mexico. 



A blackish or sometimes an almost en- 

 tirely sooty variety inhabiting West- 

 ern North America. In all respects its 

 breeding habits are the same as those of 

 the Eastern representative, nesting in the 

 branches of lofty oaks, pines, sycamores, 

 etc. In mountainous regions the nests are 

 often placed on the narrow ledges of cliffs. 

 The eggs cannot be distinguished from 

 those of B. hofcalis. 



337*. Western Red-tail. 



337r. ST. LUCtTS RED-TAIL. Buho borvalin Iiicumiiiiii Ridgw. Geog. Dist.— 

 Peninsula of Lower California. 



This subspecies is confined to the Peninsula of Lower California. Its nesting 

 and eggs are identical with the above variety. 



337d. HARLAN'S HAWK. Buteo burralls liarlaiii Aud. Geog. Dist.— Gulf 

 States and Lower Mississippi Valley, north to Pennsylvania, Iowa and Kansas; south 

 to Central America. 



