CASTOR. 39 



Genl. Char. Similar to M. caligata, but smaller; skull has shorter 

 nasals and the premaxillae narrower. 



Color. Nose white; head on top black; sides of neck and shoul- 

 ders iron-gray, as are also the flanks; hind neck and between shoulders 

 grayish white; lower back and rump buff, hairs tipped with black; 

 underparts whitish; tail all around reddish, tip black; hands and 

 feet black. Ex type in United States National Museum. 



Measurements. Total length, 670; tail, 185; hind foot, 94. 

 Skull: Occipito-nasal length, 88.5; Hensel, 77.9; zygomatic width, 

 61.5; intertemporal width, 17; length of nasals, 33.4; length of upper 

 molar series, 22.6; length of mandible, 67.4; length of lower molar 

 series, 20.2. Ex type in United States National Museum. 



Family Castoridae. Beavers. 

 Genus Castor (57). 



Castor canadensis phaeus Heller. 



Castor canadensis phceus Heller, Univ. Calif. Pub. Zool., V, 1909, 



p. 250. 

 Type locality. Pleasant Bay, Admiralty Islands, Alaska. 



Castor subauratus Taylor. 



Castor subauratus Taylor, Univ. Calif. Pub. Zool., X, 1912, p. 167. 



Type locality. Grayson, San Joaquin River, Stanislaus County, 

 California. 



Castor canadensis texensis Bailey. 



Castor canadensis texensis Bailey, N. Am. Fauna, No. 25, 1905, 



p. 122. 

 TEXAS BEAVER. 



Type locality. Cummings Creek, Colorado County, Texas. 



Geogr. Distr. Eastern Texas. 



Genl. Char. Coloration pale; skull with short sagittal crest, lateral 

 ridges lyrate or spreading; supra-occipital crest doubly curved; nasals 

 long, spatulate, tapering to a point posteriorly. 



Color. Pale brown above, beneath ash-gray. Ex type in United 

 States National Museum. 



Measurements. Hind foot, .74; naked portion of tail, 265 long, 

 113 wide (dry skin). Skull: basal length, 136; nasals, 57; breadth 

 of nasals, 30; zygomatic breadth, 107; intertemporal breadth, 29; 



