22 MICROSCIURUS. 



1 Genus Microsciurus. 



Microsciurus Allen, Bull. Am. Mus. Nat. Hist., VII, 1895, p. 332. 

 Type Sciurus alfari Allen. 



Microsciurus alfari venustulus Goldman. 



Microsciurus alfari venustulus Goldm., Smith. Misc. Coll., LVI, 

 1912, p. 4. 



Type locality. Gatun, Canal Zone, Panama. 



Genl. Char. Similar to M. alfari but less red; nasals narrower, 

 and jugal weaker. 



Color. Top of head and cheeks cinnamon-rufous; upperparts and 

 outer sides of limbs grizzled cinnamon-rufous, the hairs having sub- 

 terminal reddish bands and black tips; underparts and under sides of 

 limbs grayish brown suffused with cinnamon-rufous; hands and feet 

 dark rusty brown; tail above grizzled black and cinnamon-rufous, 

 with a broad edge of the latter color; beneath cinnamon-rufous and 

 black, the latter predominating. Ex type in United States National 

 Museum. 



Measurements. Total length, 250; tail, 102; hind foot, 40. Skull: 

 Occipito-nasal length, 36.5; Hensel, 26.9; zygomatic width, 23.2; 

 intertemporal width, 14; length of nasals, 10.5; palatal length, 15; 

 length of upper molar series (anterior premolar absent), 5.4; length 

 of mandible, 8; length of lower molar series, 6.1. Ex type in United 

 States National Museum. 



Microsciurus isthmius vivatus Goldman. 



Microsciurus isthmius vivatus Goldm., Smith. Misc. Coll., LX, 1912, 

 No. 2, p. 4. 



Type locality. Near Cana, in the Pirri range of mountains, eastern 

 Panama. Altitude 3500 feet. 



Genl. Char. Similar to M. isthmius but paler, more olivaceous; 

 underparts orange-buff, not ferruginous. 



Color. Head and upperparts and outer side of limbs orange-buff, 

 palest on cheeks; underparts and inner side of arms orange-buff, 

 palest on middle of belly, and darkest on inner side of hind legs where 

 the dark under fur shows through; hands and feet tawny-ochraceous ; 

 tail above grizzled black and buff, beneath tawny-ochraceous; margi- 

 nal stripe black edged with grayish buff, tip black. Ex type in United 

 States National Museum. 



Measurements. Total length, 260; tail, 113; hind foot, 38. 



1 Proposed as a subgenus by Dr. Allen (/. c.) and so employed in the Check- List, 

 p. 60, but raised to full generic rank by Goldman (I.e.). 



