194 



posteriorly. Wing, 5-80; tail, G-00; culmen, 1-00. Young (18,440, Ft. 

 Benton, April 23, J A. Mullen). Generally ashy plumbeous, with a 

 decided bluish cast to the wings and tail; orbital region, lores, fore- 

 head and nasal tufts blackish; crown, abroad space below the eye, 

 from the bill across the auricular, with the middle of the abdomen, 

 pale hoary ash. Wings and tail as in the adult. 

 Hal>. Rocky Mountains north of New Mexico. 



The three very well marked climatic races of this species may be 

 defined as follows : 



A. Dusky nuchal hood reaching forward to, or to in front of, the 



eyes ; sooty plumbeous black. 



1. White frontal patch narrower than the length of the bill, 



blending gradually with the blackish of the crown. 

 Upper parts umber brownish. Young. Entirely plum- 

 beous-brown, the feathers of the crown bordered with 

 paler. Beneath paler. Wing, 550; tail, 5 '40; culmen, 

 90; depth of bill, -30. Hab. Northwest coast, from the 

 Columbia to Alaska. Var. obscurus.* 



2. White frontal patch much broader than the length of the 



bill; abruptly defined, with a convex outline, against 

 the dusky of the occiput. Upper parts dull plumbeous. 

 Young. Entirely uniform dark plumbeous. Wing, 5-25; 

 tail, 5 80 ; culmen, -95 ; depth of bill, -35. Hab. British 

 America, from the Yukon district of Alaska to Maine and 

 Labrador. Var. Canadensis. 



B. Dusky nuchal hood confined to the nape, and bluish plumbeous. 



3. White frontal patch covering the whole pileum, and melt- 



ing gradually into the plumbeous of the nape ; upper 

 parts hoary plumbeous, inclining to bluish-ash. Young. 

 Bluish plumbeous, inclining to ashy- white on the crown 

 and cheeks. Wing, 6-00; tail, G-00; culmen, 1-00; depth 

 of bill, 4 31. Hab. Rocky Mountains of the United States. 



Var. capitalist 



141. The STELLULA CALLIOPE Gould is also likely to occur on 

 the western slope of Colorado. I found it as far east as the East 

 Humboldt Mountains in eastern Nevada. 



146. PICOIDES TRIDACTYLUS (L.), var DORSALIS Baird. 

 The American three-toed woodpeckers are clearly referrible to the 



* Perisoreus Canadensis, var. obscurus Ridgway, MSS. 

 IPerisoreus Canadensis, var. capitalis Baird, MSS. 





