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APRIL, 1914. MAMMALS or NORTHERN PERU OSGOOD 185 



by Elliot. Although considerable variation may be admitted among 

 the species of this genus, it is more than likely that it is overestimated 

 in many cases on account of material having insufficient or erroneous 

 data as to locality. In specimens taken at one locality by reliable 

 collectors, variation has rather narrow limits. 



Flesh measurements of an adult male are: Total length 870; tail 

 395; hind foot 128; forearm 130; circumference of chest 320. Skull: 

 Greatest length 107; basal length 84.3; zygomatic breadth 77.3; breadth 

 of braincase 54.6; palatal length 34.3; postorbital constriction 39.4; 

 upper molar series 23.1. 



Lagothrix infumata (Spix). BROWN WOOLLY MONKEY. 



One specimen (c? ad), Puerto Arturo, near Yurimaguas. 



The name infumata, as applied to this specimen, is intended in a 

 collective sense to indicate relationship to that species rather than to 

 L. lagotricha. The head is dark seal brown as described for L. thomasi 

 but the back is without any indication of a blackish dorsal line. In 

 respect to the color of its head, therefore, it appears to resemble thomasi, 

 while in the color of its back it is like infumatus. Without material for 

 comparison, it is difficult or impossible to determine what should be 

 its exact designation. Flesh measurements are: Total length 1,071; 

 head and body 445; tail 626; hind foot 138. 



