lyj: BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



PASSERCULUS SANDWICHENSIS ALAUDINUS (Bonaparte). 

 WESTERN SAVANNA SPAKKOW. 



Similar to P. s. savanna, but wing and tail averaging longer, tarsus 

 shorter, bill more slender, and coloration decidedly paler and graj^er 

 (more so even than in P. s. sandvjichensis), with the superciliary stripe 

 usually less decided^ yellow, often white, even anteriorly. 



Adult m,ale.— Length (skins), 114.30-141.73 (129.03); wing, 65.02- 

 77.72 (72.64); tail, 45.72-57.15 (51.82); exposed culmen, 9.65-10.92 

 (10.67); depth of bill at base, 5.08-5.84 (5.33); tarsus, 19.05-22.61 

 (20.83); middle toe, 13.72-16.76 (15.49).^ 



Adult female.— Length (skins), 114.30-132.33 (124.97); wing, 65.02- 

 72.90 (70.10); tail, 44.70-53.84 (50.29); culmen, 9.65-11.43 (10.67); 

 depth of bill at base, 5.08-5.84 (5.33); tarsus, 18.29-20.83 (20 57); mid- 

 dle toe, 13.72-15.49 (15.24).' 



Western North America, from northwestern Alaska to southern 

 Mexico; breeding from Alaska (Yukon and Kowak River valleys, 

 coast of Bering Sea, Alaska Peninsula, Kadiak, etc.) southward to 



' Forty-nine specimens. 



' Tliirty-one specimens. 



Locality. 



Wing. 



Tail. 



Ex- 

 posed 

 culmen. 



Depth 

 of bill 

 at base. 



Tarsus. 



Middle 

 toe. 



MALES. 



Five adult males from Alaska Peninsula (Kukak 

 Bay) 



Ten adult males from other parts of Alaska, includ- 

 ing Kadiak Island 



Twenty-four adult males from western United 

 States and British Columbia 



Ten adult males (mostly summer birds) from south- 

 ern Mexico 



FEMALES. 



Two adult females from Alaska Peninsula (Kukak 

 Bay) 



Three adult females from other parts of Alaska 



'Twelve adult females from western United States .. 



Fourteen adult females from southern Mexico 



(mostly summer) 



68.83 

 72.14 

 71.12 

 71.37 



69.60 

 66.80 

 67.82 



49.02 

 51.82 

 49.28 

 53. 85 



48.51 

 50.04 

 47.75 



10.41 

 10.41 

 10.41 

 10.41 



10.67 

 10.16 

 10.16 



10.41 



5.33 

 6.59 

 5.33 



5.33 

 5.59 

 5.08 



20.67 

 20.32 

 20.57 

 19.81 



20.57 

 19.81 

 20.32 



16.49 

 16.75 

 14.99 

 15.24 



15.24 

 14.99 

 14.22 



It will thus be seen that there is no essential variation in measurements throughout 

 the very extensive breeding range of this form, which extends from northwestern 

 Alaska to the table-lands of southern Mexico. Many of the Mexican specimens were 

 obtained during the breeding season, and these I am unable to distinguish in any 

 way from breeding examples obtained at more northern localities. 



The type of Ammodramus sandwichensis brunnescens Butler (obtained November 20 

 in the Valley of Mexico) is a specimen of P. s. hryanti; but other specimens so 

 labeled, taken by Mr. Butler in the same locality during December, are typical 

 examples of P. «. alaudinus, and I am able to match them perfectly with fall and 

 winter specimens from the western United States. 



