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 vinderfur 

 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: Avigusta 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. H, 

 118, June 7, 1889. 



Type locality. — East Peninsula, opposite Micco, Florida. 



General characters. — Slightly larger and darker than hisp)idus, with 

 coarser more hispid pelage. 



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

 light hairs, buffy wash of the main coat 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, 



