20 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vOL. 45 



Measurements. — Measurements of type : total length, 445 ; head 

 and body, 220; tail vertebrae, 225 ; hind foot, 53 (50) ; skull, greatest 

 length, 54; zygomatic breadth, 31. 



Specimens examined. — Four, all from St. Matthew Island. 



SCIURUS LUCAS sp. nov. 



Type. — Adult female (skin and skull). No. 104,385, United States 

 National Museum. Collected on St. Luke Island, Mergui Archi- 

 pelago, January 20, 1900, by Dr. W. L. Abbott. Original number, 

 256. 



Characters. — Similar to Sciurus matthccus, but ground color of 

 upperparts and tail strongly suffused with fulvous. 



Color. — Type : general color above dull, light tawny-ochraceous, 

 grizzled by the black hair-tips and bufif subterminal annulations. 

 Sides of neck and of body ferruginous, lighter than that of Ridgway 

 and forming no very marked contrast with color of back. The 

 ferruginous of neck is a little brighter than that of body. Tail like 

 back, but more coarsely grizzled, the black terminal pencil well 

 developed. 



Skull and teeth. — The skull and teeth exactly resemble those of 

 Sciurus matthccus. 



Measurements. — Measurements of type : total length, 430 ; head 

 and body, 220; tail vertebrae, 210; hind foot, 54 (50) ; skull, greatest 

 length, 54; zygomatic breadth, 31. 



Specimens examined. — Two, both from St. Luke Island. 



Remarks. — Little though it would be anticipated, the squirrel of 

 St. Luke Island differs very noticeably from that of St. IMatthew. 

 The characters are perfectly constant so far as the rather small num- 

 ber of specimens is concerned, and from the known stability of the 

 colors in other members of the group there is no reason to suppose 

 that the differences are merely individual. 



SCIURUS CASENSIS sp. nov. 



Type. — Adult female (skin and skull). No. 104,370, United States 

 National Museum. Collected on Chance Island, Mergui Archi- 

 pelago, December 28, 1899, bv Dr. W. L. Abbott. Original number, 



185. 



Characters. — Like Sciurus davisoni (Bonhote), but size larger, 

 color, particularly that of tail, paler, and reddish areas of neck and 

 sides brighter and more strongly contrasted with surrounding parts. 



Color. — Type : back and crown a fine grizzle of black and light 

 buff, the latter slightly in excess. On sides this becomes suffused 



