224 Bulletin American Museum of Natural History. [Vol. XIII, 



Oxymycterus juliaccz is evidently closely related to O. inca 

 Thomas, agreeing very closely with it in size and proportions, 

 but differs from it so much in the color of the underparts, and in 

 certain cranial details, that the two forms seem unquestionably 

 separable. 



io. Oxymycterus apicalis, sp. nov. 



Type, No. 16064, $ ad., Juliaca, Peru, altitude 6000 feet, Jan, 7, 1900; coll. 

 H. H. Keays. 



General color above dull blackish washed with gray, darker on the median 

 area, lighter, more grayish on the sides, the hairs being there minutely tipped 

 with gray; below gray brown, with a slight buffy tinge, most pronounced on 

 the chest and throat,- the hairs being pale plumbeous basally and broadly 

 tipped with grayish white; lips and chin faintly rufescent; ears pale brown, 

 very thinly haired; fore feet dusky brown, palms pale brownish flesh color; hind 

 feet rather lighter above than the fore feet and more grayish brown, the soles 

 dark brownish, much darker than the palms; tail uniform brown above and 

 below, except that the apical fourth to third is white, in strong contrast with 

 the basal portion, the whole so thinly haired that the annulations are distinctly 

 visible. 



Measurements. Type, total length, 158 mm.; head and body, 148; tail, 

 158; hind foot, 36, without claws, 33.5; ear (in dry skin), from crown, 16, from 

 notch, 21. Another specimen, $ ad., is somewhat larger, measuring total 

 length, 350; head and body, 165; tail, 185; hind foot, 37. A very old female 

 measures exactly the same as the type. 



Skull. The skull is of the usual Oxymycterus type, the interorbital region 

 being smoothly rounded, the parietal ridges obsolete, the anterior zygoma root 

 narrow and strongly rounded on the antero-superior border, and the palatine 

 foramina very large. The nasals are very long, extending back considerably 

 beyond the posterior border of the anterior zygomatic arch. The skull of the type 

 measures as follows: total length, 38; basal length, 30; length of nasals, 17; 

 diastema, 9; zygomatic breadth, 17.5; interorbital breadth, 8; mastoid breadth, 

 14.8; palatal foramina, 8.6x3.5; upper molar series, 6. 



Oxymycterus apicalis is based on four specimens, two adult 

 males, one adult female, and a * young adult ' female, all collected 

 at Juliaca, Peru, Dec. 20, 1899, and Jan. 4-7, 1900, by Mr. H. H. 

 Keays. He says " it seems to be the most common small mam- 

 mal here." 



This species is easily distinguished from any of its described 

 congeners by its large size, blackish coloration, and very long, 

 white-tipped tail. The white tail-tip is present in all the speci- 

 mens, but varies in length from about one sixth to one third of 

 the total tail length. 



