22 MERRIAM 



recognized by its large size, broadly spreading zygomata, large bullae, 

 and strongly protruding upper incisors. 



MICROTUS YAKUTATENSIS sp. nov. Yakutat Vole. 



Type from north shore of Yakutat Bay, Alaska. No. 9S005 $ ad. 



U. S. National Museum, Biological Survey Collection. June 19, 



1899. C. Hart Merriam. Orig. no. 2101. 



Characters. — Size rather large ; tail very shoi-t ; coloration grayish 

 brown or bister ; feet and underparts whitish. Similar \.o sitkensis 

 but feet smaller ; tail much shorter ; upperparts less fulvous; under- 

 parts and feet whitish instead of dark. Cranial characters as in sit- 

 kettsis. 



Color. — Upperparts bister or grayish brown, intimately mixed with 

 black hairs (which sometimes form a darker area along median line 

 from occiput to shoulders), and grizzled with buffy fulvous ; under- 

 parts whitish or buffy whitish, the plumbeous of underfur showing 

 through; fore and hind feet whitish; tail sharply bicolor, narrowly 

 blackish above, broadly whitish or buffy beneath. 



Cranial characters. — Skull like that of sitke?zsis but differing 

 slightly; nasals somewhat longer ; jugals slightly larger. 



]\Ieasuref?ients. — Type specimen : total length 172; tail vertebras 

 38; hind foot- 21. Average of ten adults from type locality: total 

 length 165 ; tail vertebrae 37; hind foot 21. 



MICROTUS UNALASCENSIS POPOFENSIS subsp. nov. 

 Popof Island Vole. 



Type from Popof Id., Shumngin Islands, Alaska. No. 97956 $ ad. 



U. S. National Museum, Biological Survey Collection, Jul}' 16, 



1S99. W. E. Ritter. Orig. no. 2200 (Fisher catalogue). 



Characters. — Size, external appearance, and coloration similar to 

 unalascensis and kadiacensis^ but cranial characters differing from 

 both : contrasted with 7t?ialascensis the anterior end of frontal is less 

 broadened and fails to develoj> a laclirymal tubercle; audital bullas 

 smaller and less inflated; incisive foramina larger and more broadly 

 open anteriorly; zygomata more sharply elbowed at anterior base (as 

 seen from above) ; jugal narrower. Contrasted with kadiacensis the 

 anterior end of frontal is narrower and fails to develop a lachr^'mal 

 tubercle; bulla' more inflated, blunter, and more rounded anteriorly; 

 molars slightly larger. 



In young specimens (and one adult, apparently in left-over winter 

 pelage) the fur is longer and softer, the upperparts are more buffy 

 fulvous, and the white of the underparts is wasl^ed with yellowish buff. 



