96 Fretp Museum or Naturat History — Zooroey, Vor. X. 
black; toes white; postocular spots buffy white sharply contrasted with 
surrounding black; under parts wholly ochraceous buff, the hairs mostly 
self-colored except on the sides of the neck and sides of belly where they 
have pale drab bases; dark and light areas of scaly part of tail about 
evenly divided. 
Skull large and very elongate; nasals pointed behind and extending 
far beyond the posterior border of the lacrymal (in type, nearly to 
plane of postorbital processes) ; jugal not greatly expanded. 
Measurements. Type and adult female paratype, respectively: 
Total length 572, 553; head and body 284, 275; tail 288, 278; hind foot 
40, 35. Skull of type: Greatest length 78.8; zygomatic breadth 37.9; 
interorbital constriction 9.3; width across postorbital processes 13.5; 
nasals 39.6 x 10; breadth of braincase 21.3; palate length from gnathion 
45.3; front of canine to back of M 4 31.2; M! to M * 11.6. 
Remarks. This handsome species is evidently widely different in 
color from any previously described. Doubtless its nearest relative is 
M. opossum of Guiana and Brazil from which it is easily distinguishable 
by its broad and sharply defined black dorsal stripe and its richly buffy 
under parts. 
Metachirus canus sp. nov. 
Type from Moyobamba, Peru. No. 19347 Field Museum of Natural 
History. Male, young adult. Collected Aug. 4, 1912, by W. H. 
Osgood and M. P. Anderson. 
Characters. A pale gray species allied to M. grisescens of west 
central Colombia, but differing in having a bicolor tail, more blackish 
upper parts and paler under parts. Upper parts uniform peppery 
gray, the hairs tipped with silvery and dusky brownish; head dark brown 
more or less sprinkled with silvery; under parts pale cream buff, stronger 
anteriorly, becoming more whitish posteriorly; gray of sides encroaching | 
largely on belly; feet pale drab proximally, white distally; toes white; 
slightly less than distal half of tail white, remainder blackish. 
Skull of medium size; nasals decidedly shorter than in M. grisescens 
and abruptly terminated after their moderate posterior expansion; 
premaxillaz short, scarcely exceeding posterior plane of canine; palate 
highly fenestrate posteriorly; maxillary end of jugal broad and deep, 
its lower border practically parallel with the alveolar boundary of the 
maxillary; occipital condyle decidedly projected beyond inion; last 
upper molar trilobate in form, not so regularly triangular as in related 
species. 
Measurements. Type: Total length 568; head and body 275; tail 
