68 



Eestricting the geuns, then, to the Aiuerican forms and a single Sibe- 

 rian ally {L. hri(nneinucha)y the following sjjecies and geographical races 

 may be defined : 



Common charactees. — Feathers of the rump, abdomen, and flanks, 

 lesser and middle AYing-coTerts, and upper and lower tail-coverts, broadly 

 tipped with rose-red, the concealed portion being clear dusky; greater 

 wing-coverts, lemiges, and rectrices clear blackish dusky, narrowly 

 skirted with rosy or whitish ; anterior portions of the body uniform 

 brown or dusky. 



A. Nasal tufts white : 



a. Head iKirtly silvery gray : 



1. L. ATEATA, Eidgway. — Sexes very dissimilar. J7«?e; prevail- 

 ing color black, the doisal region with a sooty cast. Female : 

 prevailing color dull slate, the back more brownish ; rosy 

 markings of the male nearly obsolete. Gray of the head 

 (both sexes) confined to the posterior and lateral i^ortions of 

 the pileum. Wing, 3.80-4.20 (4.02*); tail, 2.80-3.15 (2.97) ; 

 culmen, .40-45 (.43) ; tarsus, .75-80 (.77) ; middle toe, .55-.60 

 (.59). Hab. — Uintah Mountains, Utah, September, Dr. Hay- 

 den; Caiion City, Colorado, April 18-20, C. E. Aiken. 



2. L. tepheoootis, Swainson. — Sexes alike ; prevailing color 

 reddish brown, varying from a raw umber shade to chocolate, 

 chestnut, or reddish sepia ; gray of the head extremely vari- 

 able in extent. Wing, 3.80-4.85; tail, 2.70-3.90; culmen, 

 .40-.62 ; tarsus, .75-1.00 ; middle toe, .50-.75. H ah. j-EntirQ 

 area of the northwestern countries of North America, and 

 southward in the Eocky Mountains of the United States at 

 least to latitude 38°. 



*Gray of the head strictly confined to the posterior and lateral por- 

 tions of the pileiun {as in L. ateata) : 



Prevailing color varying from raw umber to reddish 

 chocolate. Wing,^ 3.80-4.40 (4.11); tail, 2.75-3.30 

 (3.00);+ culmen, .40-.50 (.40); tarsus, .75-.86 (.79) ; 

 middle toe, .50-65 (.57).i: Hah. — In summer, the in- 

 terior of British America (Saskatchewan, May, 

 Swainson) ; in winter, the entire Eocky Mountain 

 region of the United States, chiefly the eastern slope, 

 southward to at least latitude 38° (Canon City, 

 Boulder, and adjoining places in Colorado, in Feb- 

 ruary, March, and April, C. E. Aiken and Mrs. 

 Maxwell ; Fort Saunders, Wyoming, A. G. Beack- 

 EiT ; Sherman, Wyoming, C. 11. HoLDEN ; Fort Lar- 

 amie, Wyoming, and Deer Creek, Dr. Hayden; Salt 

 Lake City, Utah, Captain Stansbuey). 



var. tephrocotis, Swainson. 



* The figures inclosed iu parentheses denote the average of the whole series of specimens 

 measured. 



tOue hundred and fifty-five specimens. 

 I One hundred and sixteen specimens. 



