RODENTIA: CRICETIDAE 443 



Genus NECTOMYS ' Peters 

 1861. Nectomys Peters, Abhandl. Preuss. Akad. Wiss. Berlin, 1860, p. 151. 

 (Type, Mus squamipes Lichtenstein.) 



Subgenus SIGMODONTOMYS J. A. Allen 



1897. Sigmodontomys J. A. Allen, Bull. Amer. Mus. Nat. Hist., vol. 9, p. 38, 

 Mar. 11, 1897. (Type, Sigmodontomys alfari J. A. Allen. See Goldman, 

 Proc. Biol. Soc. Washington, vol. 29, p. 127, June 6, 1916.) 



Nectomys alfari alfari (J. A. Allen) * 



1897. Sigmodontomys alfari J. A. Allen, Bull. Amer. Mus. Nat. Hist., vol. 9, 



p. 39, Mar. 11, 1897. 

 1908. Oryzomys cchraceus J. A. Allen, Bull. Amer. Mus. Nat. Hist., vol. 24, 



p. 655, Oct. 13, 1908. ( Rio Grande, Zelaya, Nicaragua.) 

 1913. Nectomys alfari alfari Goldman, Smithsonian Misc. Coll., vol. 60, No. 22, 



p. 7, Feb. 28, 1913. 

 Type Locality. — Jimenez, upper Rio Jimenez, Limon, Costa Rica. Altitude, 

 700 feet. Range. — Atlantic drainage areas of Nicaragua and Costa Rica (Hersh- 

 kovitz, Univ. Michigan Mus. Zool. Misc. Publ. 58, p. 75, Jan. 4, 1944). 



Nectomys alfari efficax Goldmanf* 



1913. Nectomys alfari efficax Goldman, Smithsonian Misc. Coll., vol. 60, No. 

 22, p. 7, Feb. 28, 1913. 



Type Locality. — Cana (Santa Cruz de Cana), upper Rio Tuyra, Darien, east- 

 ern Panama. Altitude, 1,800 feet. Range. — Known only from northwestern 

 slope of Serrania del Darien, Panama (Hershkovitz, Univ. Michigan Mus. Zool. 

 Misc. Publ. 58, p. 76, Jan. 4, 1944) . 



INCERTAE SEDIS 10 



Nectomys dimidiatus Thomas 



1905. Nectomys dimidiatus Thomas, Ann. Mag. Nat. Hist., ser. 7, vol. 15, 

 p. 586, June 1905. 



Type Locality. — Rio Escondido, 7 miles below Rama, Zelaya, Nicaragua. 

 Range. — Known from type locality only. 



Genus RHIPIDOMYS Tschudi 

 1844. Rhipidomys Tschudi, Arch. Naturg., Jahrg. 10, vol. 1, p. 252. (Type, 

 Hesperomys leucodactylus Tschudi.) 



Rhipidomys scandens Goldmanf* 



1913. Rhipidomys scandens Goldman, Smithsonian Misc. Coll., vol. 60, No. 

 22, p. 8, Feb. 28, 1913. 



Type Locality. — Near head of Rio Limon, Mount Pirri, Darien, eastern Pana- 

 ma. Altitude, 5,000 feet. Range. — Known from type locality only. 



Genus TYLOMYS Peters 

 1866. Tylomys Peters, Monatsb. Preuss. Akad. Wiss. Berlin, 1866, p. 404. 

 (Type, Hesperomys (Tylomys) nudicaudus Peters.) 



9 Revised by Hershkovitz, Univ. Michigan Mus. Zool. Misc. Publ. 58, pp. 1-88, Jan. 4, 1944. 



10 See Hershkovitz, Univ. Michigan Mus. Zool. Misc. Publ. 58, p. 80, Jan. 4, 1944. 



