476 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Type-locality. — Carrizo Creek, Colorado Desert, San Diego County, 

 California. (Type, skin and skull. Cat. No. f|ftf, U. S. National 

 Museum.) 



Geographical range. — Lower Sonoran Zone of the Colorado Desert. 



Description. — " Size moderate. Ears large and thin. Tail as long 

 as the head and body. Upper surfaces mingled buff and ])ale gray. 

 Sides clearer buff, sharply marked off from the color of the under sur- 

 faces, which, together with the feet, are pure white. Hairs white to 

 the base on the tlu'oat, sides of cheeks, breast, inside of fore legs, ingui- 

 nal region, and feet. A tuft of pure white hairs at the base of the 

 outer margin of the ears. Ears thinly clothed with long, wliitish hairs. 

 Tail gray above, pure white below. Skull thick and massive. Nasals 

 shorter than the intermaxilla? and much contracted posteriorly. Inter- 

 parietal large, with a convex posterior margin. Incisive foramina 

 short and broad, reaching posteriorly about to the line of the molars. 

 Tymj^anic bulla^ large. Foramen magnum low and wide. Posterior 

 termination of palate concave. Incisors very broad and convex. 

 Molars long and broad." (True.) 



RemarJcs. — This species is most closely related to Neotoma cumula- 

 tor, fi'om which it differs in having a softer and denser pelage and paler 

 and more ashen color. The size is smaller. The type (No. fHou> 

 U.S.N.M.) measured in the flesh by Mr. Frank Stephens, presented the 

 following dimensions: Total length, 364 mm.; tail vertebrae, 173; hind 

 foot, 35. The skull measured 44 by 24 mm. in its greatest diameters. 

 Another specimen (No. Hftl, U.S.N.M., from Buregas Spring, Col- 

 orado Desert, California), also collected by Mr. Stephens, measured: 

 Total length, 366 mm. ; tail vertebra^, 174 ; hind foot, 35. Skull 44.5 by 

 23.5. The skull differs from those of N. cumulator in the following 

 particulars: The brain-case is broader and higher, which causes the 

 supraorbital rims to diverge more rapidly; the premaxillaries are 

 shorter, not extending far behind the nasal bones, which latter are 

 less expanded apically; the palatal slits are shorter; the anteorbital 

 foramen is wider; the audital bullae are larger; and the teeth are 

 smaller. Neotoma venusta is entirely distinct fi'om Neotoma inter- 

 media gilva inhabiting the same region. 



NEOTOMA ALBIGULA Hartley. 

 WHITE -THROATED WOOD-RAT. 



Neotoma alhigula Hartley, Proc. Cal. Acad. Sci.,2dser., Ill, pp. 1.57-159, pi. xii, 



May 9, 189-4 (original description). 

 Neotoma intermedia alhigula, Merriam, Proc. Acad. Nat. Sci. Phila., Sept. 24, 1894, p. 



248.— Miller and Eeiin, Proc. Best. Soc. Nat. Hist., XXX, No. 1, Dec. 27, 1901, 



p. 105 (Syst. Eesults Study N. Am. Mam. to close of 1900). 

 [Neotoma intermedia] alhigula, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 162 



(Synop. Mam. N. Am.); IV, 1904, p. 285 (Mam. Mid. Am.). 



