258 Bulletin American Museum of Natural History. [Vol. XVI, 



Didelphis marsupialis LINN., Syst. Nat. ed. 10, I, 1758, 54 (part); ed. 



12, I, 1776,72 (part). ERXLEBEN, Syst. Reg. Anim. 1777, 73 



(part). GMELIN, Syst. Nat. I, 1788, 105, ex Schreber. 



THOMAS, Amer. Nat. XXXV, Feb. 1901, 144, (nomenclature); 



Ann. and Mag. Nat. Hist. (7) VIII, Aug. 1901, 153 (British 



Guiana, nomenclature) . 

 Didelphys marsupialis SCHREBER, Saug. Ill, 1778, 536 (mainly; not 



pi. cxlv*, which is D. virginiana.} Also in part of most later 



compilers. 

 Didelphys marsupialis var. typica THOMAS, Cat. Marsup. and Monotr. 



1888, 323 (part). 



Le Crab-ier, BUFFON, Hist. Nat. Suppl. Ill, 1776, 272, pi. liv. Cayenne. 

 Didelphis karkinophaga ZIMMERMANN, Geogr. Gesch. II, 1780, 266 = 



Le Crabier, Buff on. ALLEN & CHAPMAN, Bull. Am. Mus. 



Nat. Hist. IX, 1897, 30 (part). ALLEN, Proc. Biol. Soc. Wash. 



XIV, 92, June 19, 1901 (nomenclature); Bull. Am. Mus. Nat. 



Hist. XIV, 1901, 151, 153 (in text). 

 Didelphis cancrivora GMELIN, Syst. Nat. I, 1788, 108 Le Crabier, 



Buffon. DESMAREST, Nouv. Diet, d' Hist. Nat. VI, 1803, 458. 



TEMMINCK, Mon. Mamm. 2 Mon. 1825, 32, pi. v, skull and 



skeleton. 

 Didelphys cancrivora WAGNER, Schreber's Saug. Suppl. Ill, 1843, 4 1 ! 



V, 1855, 225. WATERHOUSE, Nat. Hist. Mamm. I, 1846, 473. 



CABANIS, Schomburgk's Reisen Brit.-Guiana, III, 1848, 777. 

 Type Locality. Guiana. 



Geographical Distribution. Guiana, eastern Venezuela, and prob- 

 ably southward into northern Brazil. Exact range not known. 



Above yellowish white, varied with black; underfur yellowish 

 white, the tips of the longer fibres blackish; overhair stiff, bristly, 

 white basally, black on apical half. A narrow blackish eyering, but 

 no other facial markings, the whole head being dingy yellowish white 

 with the tips of the hairs blackish, giving a slight general dusky wash. 

 Ventral surface yellowish white, with a slight dusky brown wash, 

 formed by the tips of the longer hairs. Fore and hind limbs, including 

 upper surface of feet, deep brownish black. Ears large, wholly black. 

 Tail black for the basal two-thirds of the naked portion, apical third 

 light flesh-color. 



Measurements. Two males from the Kanuka Mountains, British 

 Guiana, measure: Total length, 762 and 775 mm.; head and body, 

 381 and 381; tail, 381 and 394; hind foot, 57; ear, 57. A female 

 (same locality) measures : Total length, 712; head and body, 330; tail, 

 382; hind foot, 51; ear, 51. Another female from Mapures, Venezuela, 

 measures: Total length, 776; head and body, 357; head and body, 

 419; hind foot, 54; ear, 52. Skull: Three males, total length, 101 

 (95-107); basal length, 92 (86-98); nasals, 48 (45-50); zygomatic 

 breadth, 51 (48-55) ; postorbital breadth, 22 (20-24.5) ; postorbital con- 



