820 PROCEEDINGS OF THE NATIONAL MUSEUM. voi-.xxiv. 
differentiated toward leucolcema. The eyebrow and forehead in all 
are pure white, Avhich, together with <^he pale upper surface, impart 
a general appearance strikino-ly .suggestive of some intermediates 
between leucolceina and the southwest form ajjhrasia, though, of course, 
upon close inspection seen to be darker. The females of this North 
Dakota series appear to be less intermediate than the males, having, 
on the light areas above, very little of the buffy tinge of leueolcema. 
They are also paler and more grayish than the same sex oi 2yraticola. 
The throat of typical enthymla is usually pale yellovv^, but even in 
winter is occasionally pure white. 
The writer is inde])ted to the kindness of Dr. Louis B. Bishop, of 
New Haven, for the privilege of describing the present race. It is 
but fair to state that he some time ago noticed its distinctness from 
the Colorado bird, and had in mind its formal separation; nevertheless 
he generously waived his claim and placed his material at my disposal. 
Sixty-seven specimens have been examined, from the following 
localities, breeding records being indicated by an asterisk: 
Arizona. — San Francisco Mountain. 
Colorado. — Lo veland. 
Kanms. — Pendennis; Ellis. 
Montana. — Fort Keogh; Miles City; Fort Union. 
Nihm.shi. — Valentine. 
North, Dakota. — Dicivinson; Cando;'' Kock Lake, Towner County.* 
tiouth Dakota. — Spearfish. 
Utah. — Santa C Uara. 
Wyoming. — Laramie. 
Assrnihoia. — Indian Head.* 
jSaskatchr/ra/i. — St. Louis.* 
OTOCORIS ALPESTRIS LEUCOL^qEMA (Coues). 
Eremo])h'da ((Iprxlrls h. lencohvina Coues, Birds Northwest, 1874, p. 38. 
(>t(ici}ris al])etitris leucohcmaiiTE.]tiEGER, Proc. U. S. Nat. Mus., V, 1882, p. 84. 
< )l()c<)i'i/s alpestris arenicola Henshaw, Auk., I, July, 1884, p. 265. 
Ohicorls (dpcdris arenicola Dwight, Auk., VII, April, 1890, p. 146. — KiixavAY, 
Man. N. Am. Birds, 2d ed. 1896, pp. 348-349. 
Chars. suh.sjK — Similar to Otoeoris a. enthy/iu'a, but more ocliraceous 
above, the eyebrow usually yellowish. 
Measureme?its {15 males). — Wing, lUi-110 (average, 105. S) nun.; tail, 
68-77 (average, 71.5) mm. ; exposed culmen, 10-13 (average, 11.5) nrni. ; 
tarsus, 20.5-23 (av^erage, 21.8) mm.; middle toe, 11-12 (average, 11.7) 
mm. 
Type locality. — Fort Randall, South Dakota. 
Geoijraphlcal distrlhution. — In summer, western United States from 
central Dakota, western Kansas and western Nebraska to Idaho and 
Nevada, north on the eastern side of the Rocky Mountains to Alberta; 
