56 RHEOMYS. OTOTYLOMYS. SIGMODON. 



Rheomys raptor Goldman. 



Rheomys raptor Goldm., Smith. Misc. Coll., LX, No. 2, 1912, p. 7. 



Type locality. Near head of Rio Limon, Mount Pirri, eastern 

 Panama. Altitude, 4,500 feet. 



GenL Char. Size small; color dark. Skull with frontal region not 

 depressed, bullse low, short. 



Color. Upperparts, nose to tail, mixed cinnamon and black; 

 flanks grayer; underparts pale mouse-gray; under fur plumbeous; 

 some white hairs on rump which is slightly darker than back; tail 

 black above and beneath; hands and feet brown grading into white 

 fingers and toes. Ex type in United States National Museum. 



Measurements. Total length, 201; tail, 94; hind foot, 23.5. 

 Skull: Occipito-nasal length, 25.2; Hensel, 19.8; zygomatic width, 

 13.5; intertemporal width, 4.9; length of nasals, 9.6; length of upper 

 molar series, 4.3; length of mandible, 12.4; length of lower molar 

 series, 3. Ex type in United States National Museum. 



Genus Ototylomys (64). 



Ototylomys fumeus Allen. 



Ototylomys fumeus Allen, Bull. Am. Mus. Nat. Hist., XXIV, 1908, 

 p. 658. 



Type locality. Matagalpa, Nicaragua. 



Color. Head and Upperparts dusky grayish brown, darkest on 

 dorsal region; throat and underparts, and inner side of limbs pure 

 white; tail naked, black, annulations broad; ears, dusky brown, 

 mostly naked. Ex type in American Museum of Natural History. 



Measurements. Total length, 330; tail, 140; hind foot, 30 (col- 

 lector). Skull: Total length, 42; Hensel, 30.5; zygomatic width, 21; 

 intertemporal width, 7.7; length of nasals, 14; length of upper molar 

 series, 6.4; length of mandible, 18.2; length of lower molar series, 6.7. 

 Ex type in American Museum of Natural History. 



Ototylomys guatemalae Thomas. 



Ototylomys guatemala Thomas, Proc. Zool. Soc. Lond., 1909, p. 670. 



Type locality. Tucuru, Poloehie River, about 50 miles east of 

 Coban, Guatemala. 



Genus Sigmodon (65). Cotton Rats. 



Sigmodon hispidus griseus Allen. 



Sigmodon hispidus griseus Allen, Bull. Am. Mus. Nat. Hist., 



XXIV, 1908, p. 657. 

 Type locality. Chontales, Nicaragua. 



