. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 12 Annals of the Carnegie Pelage.—Upper parts dark cinnamon-brown^ in tone, sides lighter, demarcation between same and drab-gray under parts better defined than in the larger helleri. Tips of hair over upper parts ochraceous to light buff; on lower parts gray washed with light bufT; anterior and ocular portions of face without the light markings of the larger species; ears well clad, contrasting with the poorly clad, to much worn ears of 0. j. helleri; light posterior orbital p
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 12 Annals of the Carnegie Pelage.—Upper parts dark cinnamon-brown^ in tone, sides lighter, demarcation between same and drab-gray under parts better defined than in the larger helleri. Tips of hair over upper parts ochraceous to light buff; on lower parts gray washed with light bufT; anterior and ocular portions of face without the light markings of the larger species; ears well clad, contrasting with the poorly clad, to much worn ears of 0. j. helleri; light posterior orbital patches same in both subspecies; tail dark above, light below (annulations 14 to 10 mm. Fig. I. Lower inci- against II to lo nmi. in the larger form); cov- sorsof type (No. 29). i- pred with dark light-tipped hair, claws light to viewed from in front; 2, , translucent. 2 from above. X - I Genus Gerbillus Desmarest. 4. Gerbillus bilensis sp. nov. Type from dry plain near Bilen, Abyssinia. (Original field-number 7519, Dec. 19, 1911.) General Characters.—In markirgs and coloration closely agrees with the description of the much larger G. pyranriduni Geoffroy of Egypt (see J. Anderson, "Zoology of kgypt," 1902, p. 255) and differs from G. pygargiis Cuvier from Suakin (/. c, p. 256) and G. pulvinatiis Rhoads from southern Abyssinia, which it more nearly resembles in size, by its pronouncedly dark median dorsal area, black eye-lids, dark postocular stripes, and strongly buif coloration of the under surface of the tail. Skull.—The hinder portion of the skull of the type is gone; the molars are somewhat worn. with the type of G. pulvinatiis Rhoads,'' the general proportions arc the same, but the interorbital region is slightly broader. Pelage.—Median portion of back and rump heavily marked with black, anterior and lateral portions bright ochraceous buff (cf. Ridg- way), under parts pure white. Indi\idual hairs of upper fianks and back light slate-gray at base
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