8o NELSON 



Macroxus collicei Gray, Ann. & Mag. Nat. Hist., 3d sen, xx, pp. 421-422, 

 1867 (part : var. i). 



Sciurus hypopyrrhus Allen, Mon. N. Am. Rodentia, pp. 746-750, 1877 

 (part: No. 7019 from La Union, Salvador); Bull. U. S. Geol. Survey 

 Terr., iv, pp. 881-882, 1878 (part); Alston, Proc. Zool. Soc. London, 

 1878,' pp. 662-664 (part) ; Biol. Cent.-Am., Mamm., pp. 128-131, 1880 

 (part). 



Type locality. — Salvador, Central America. Type in British Mu 

 seum. 



Distribution. — Tropical forests of Salvador, vs^est coast of Central 

 America. 



Characters.— Y.Vi\\x^ upperparts and base of tail dingy yellowish 

 gray ; underparts and feet dull buffy ochraceous. Tail rather slender ; 

 pelage thin ; hairs of back coarse, stiff and shining ; under fur short 

 and thin. 



Color. — Entire upperparts, including top of head, outside of legs 

 near body, and base of tail all round, nearly uniform dull grizzled 

 buffy gray ; backs of ears pale rusty with basal patches of dull buff, and 

 narrow indistinct borders of black ; feet, and outside of legs on lower 

 half, dark ochraceous buff; paler or grayer buffy on chin, sides of nose 

 and cheeks; underparts dark dingy buff; tail above, black washed with 

 white ; below, with broad median area like back, bordered by line of 

 black and edged with grayish white. Hairs on back black, with broad 

 median rings of pale yellowish gray; under fur dark sooty plumbeous. 



Afeasurements. — Dry skin from La Union, Salvador, No. 7020 

 adult, U. S. Nat. Museum : total length 545 ; tail vertebrae 2S0 ; hind 

 foot 66. 



Cranial characters. — Premolars \. Skull similar to that of S. 

 thomasi, but proportionately narrower and slenderer with much lighter 

 jugals and smaller audital bullae. It measures: basal length 49; pal- 

 atal length 26 ; interorbital breadth 20 : zygomatic breadth 34 ; length 

 of upper molar series 1 1 . 



General 7zotes. — The specimen described above was compared with 

 Ogilby's type in the British Museum by Mr. Thomas, who pronounces 

 the two identical, and adds that the type of S. griseocaudatus Gray 

 differs from them only in having the color of the belly a little richer. 

 Ogilby described this species from a specimen taken during the voyage 

 of the ' Sulphur,' and later Gray described S. griseocaudatus from 

 another specimen collected during the same voyage. By an error, 

 Ogilby stated that his specimen came from the west coast of South 

 America, but Gray gave the locality of his type more correctly as the 

 west coast of Central America. Lesson's S. pyladei from San Carlos, 



