330 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



mandibular tomium straight nearly to the slightly produced subbasal 

 angle. Nostril small, longitudinally oval, in triangular fossae, nearly 

 concealed by small bristly feathers. Rictal bristles fairly developed, 

 but very fine. Wing rather long (a little more than three to more 

 than three and a half times as long as tarsus), rather pointed (eighth 

 to sixth or seventh to fifth primaries longest, the ninth shorter than 

 fifth or fourth); primaries exceeding secondaries by decidedly less 

 than length of tarsus. Tail nearly as long as wing or slightly longer, 

 slightly rounded or double-rounded with the lateral rectrices shorter 

 than middle pair, less than half hidden by upper coverts. Tarsus 

 moderate (about one-third as long as tail or less), its scutella distinct; 

 middle toe with claw shorter than tarsus or (in Z. alhicollis) about as 

 long; lateral claws scarcely reaching to base of middle claw; hallux 

 shorter than lateral toes, its claw a little shorter than the digit. 



Coloration. — Adults grayish or brownish above, the back conspicu- 

 ously streaked with chestnut-brown or dusky, the wings with two 

 white bands; pileum with two broad lateral stripes of black inclosing 

 one of white or yellow, or else wholly black; under parts whitish, 

 becoming grayish on chest, or else throat black, the sides with or 

 without streaks. Young streaked above and below; in first winter 

 like adults, but with the black and white head-stripes replaced by simi- 

 lar ones of chestnut-brown and buffy, or dark rusty brown (black 

 streaked) and olive-grayish, or else crown chiefly olive-yellowish, or 

 black scaled with buffy grayish. 



Z. alhicollis differs from all the other species of this genus in its 

 much rounded wing (seventh to fifth instead of eighth to sixth, pri- 

 maries longest, the ninth shorter than fourth instead of longer), and 

 in having the tail equal to or slightly longer than the wing. Z. coro- 

 nata has a relatively longer tarsus than the other species. 



Range. — North America; breeding in the Boreal Province, including 

 most of its southern "islands," especially in western United States; 

 south into Mexico in winter. 



KEY TO THE SPECIES AND SUBSPECIES OP ZONOTRICHIA. 



a. Chest not streaked or else snpraloral region more or less yellow. 

 6. Pileum without median stripe; chest without gray. (Great Plains, Texas to 



Manitoba, etc. ) Zonotrichia querula (p. 331) 



hh. Pileum with a median light-colored stripe; chest gray or grayish, 

 c. Pileum with more or less of yellow on anterior portion. (Pacific coast; Cali- 

 fornia to Alaska. ) Zonotrichia corouata (p. 333) 



cc. Pileum without any yellow. 

 d. Snpraloral region not yellow; ground color of back not rusty brownish. 

 6. Lateral crown-stripes black. (Zonotrichia leucophrys, adults.) 

 /. Upper half of lores black, extending to anterior angle of eye. (Nearly 

 the whole of United States and more eastern parts of British America. ) 

 Zonotrichia leucophrys leucophrys, adult (p. 336) 

 ff. Whole loral region whitish, continuous with the superciliary stripe. 



