

SKKTH AND KOO8 OF 



foriMix nt wr^aih at either end. The largest eggs in Mr. Norris' collection 

 measure 2.41x1 xt. 2.37x2.00; the smallest. 2,17x1.80, 2.20x1.78. The average size is 

 23xl.SO. 



337. KBIDBB'S HAWK. /Mro b<,rt-nli* kriderii Hoopes. Geog. Dist. Great 



Plain* of th< I'riitfd states, from Minnesota to Texas. 



This liKhtrr rolorfd v;irlfty of thr ; Red-tailed Hawk occurs in the Great Plains, 



from Mlnm -'/a "> Texas; east Irregularly or casually to Iowa and Northern Illinois. 

 -.1 hi I ! writeB 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 eg*a 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 cotton wood 

 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/>. WESTERN RED-TAIL. Butrn 

 boreal is caliiras (Cass.) Grog. D.^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 R. borcalis. 



137*. 



RfcD-TAIL. 



liutco ImrniHx t unman ux Ridgw. Geog. Dist. 



337 . ST. LUCUS BED-TAIL. 

 Peninsula of Lower California. 



This subspecies is confined to the Peninsula of Lower California. 

 and eggs are identical with the above variety. 



Its nesting 



337c/. HABLAN S HAWK, ttuteu borcall* Jiarlani Aud. Geog. Dist. ;u!f 

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

 to Central America. 



