104 Bailey North American Species of Sigmodon. 



Sigmodon hispidus Say and Ord. 



Sigmodon hispidus Say and Ord, Jour. Acad. Nat. Sci. Phila., IV, pt. 

 ii, 354, 1825. 



Type locality. St. Johns River, Florida. 



General characters. Pelage full and soft in winter, coarser and slightly 

 hispid in summer. 



Color. Upperparts rich umber brown, darkened by black underfur 

 and long black hairs; belly whitish, smoky gray or dull buffy brown; 

 feet dull rusty brown; tail blackish, slightly lighter below. 



Skull. Relatively short and wide with well arched upper outline. 



Measurements. Average of 8 adults from Riceboro, Georgia: total 

 length 256; tail 106; hind foot 32. Skull (No. 45,169, from Riceboro, 

 Georgia): basal length 32; nasals 14; zygomatic breadth 21; mastoid 

 breadth 15; alveolar length of upper molar series 6.7. 



Distribution. North Carolina to northern Florida and west to southern 

 Louisiana, in Austroriparian zone. 



Specimens examined. Total number 125, from the following localities: 



North Carolina: Raleigh 33, Elkin 1. 



South Carolina: Georgetown 6, Beaufort 27, Society Hill 1. 



Georgia: Augusta 5, Butler 5, Riceboro 20, Savannah 1, Nashville 1. 



Florida: San Mateo 1, Gainesville 3, Chattahoochee 3, Milton, 2. 



Alabama: Greensboro 5, Catherine 1, Gallion 4. 



Mississippi: Bay St. Louis 3. 



Louisiana: Houma 1, Lafayette 3, Avery 2. 



Sigmodon hispidus littoralis Chapman. 



Sigmodon hispidus littoralis Chapman, Bull. Am. Mus. Nat. Hist. II, 

 118, June 7, 1889. 



Type locality. East Peninsula, opposite Micco, Florida. 



General characters. Slightly larger and darker than hispidus, with 

 coarser more hispid pelage. 



Color. Upperparts dark sooty gray coarsely lined by the dark and 

 light hairs, buffy wash of the main cpat obscured by the long black 

 hairs and black underfur; feet and tail dark gray or blackish; upper 

 surface of tail quite black. 



Skull. Relatively larger, narrower and less arched than in hispidus. 



Measurements. Average of 6 adult topotypes: total length 284; tail 

 114; hind foot 32. Skull (No. 70,808, $ ad.): basal length 33; nasals 14; 

 zygomatic breadth 21; mastoid breadth 14.6; alveolar length of upper 

 molar series 6.8. 



Distribution. Eastern part of the peninsula of Florida, from Lake 

 Harney to the Everglades. 



Specimens examined. Total number 119 from the following localities 

 in Florida: Peninsula opposite Micco (type locality) 42, Lake Harney 29, 



