660 Bulletin American Museum of Natural History. [Vol. XXIV, 



inside of limbs) is deep ochraceous yellow, with broad areas of white on the 

 chest and lower abdomen, connected by a narrow median line of white. 

 The fluffy patch at the base of the ears varies from nearly white to clay color. 



The two specimens from Volcan de Chinandega have the dorsal surface 

 nearly as in the darkest Matagalpa specimen, black strongly prevailing; the 

 ventral surface in one is pale buffy gray, with patches of white on the breast, 

 axillae and lower abdomen ; in the other the ventral surface is pure white on 

 the neck, breast, proximal half of inner surface of the fore limbs, and on the 

 abdomen, irregularly mottled with patches of pure white and buffy gray, 

 with the hind limbs and feet black. 



The single (rather young) example from San Rafael del Norte is like 

 the Volcan de Chinandega specimens, except that the whole ventral surface 

 and inside of the limbs is pure white. 



The tail in all is black washed with white, with a slight tendency to a 

 grizzled buffy gray median band on the ventral surface. 



It is quite probable that the Volcan de Chinandega specimens represent 

 a geographical form different from that found at Matagalpa, and different 

 from the true S. griseoflavus. 



39. Sciurus richmondi Neho?i. Three specimens : Chontales, 2 males, 

 Feb. 26, 1908; Rio Grande, 1 male, March 23, 1908. These specimens 

 were taken not far from the type locality of the species. 



40. Sciurus deppei matagalpae subsp. nov. 



Type, No. 28440, $ ad., San Rafael del Norte, Nicaragua, April 10, 1907; W. B. 

 Richardson. 



Differs from S. deppei deppei in the color of the upper parts, which are yellowish 

 brown instead of rusty brown; underparts yellow, varying in different specimens 

 from pale buff to ochraceous, but generally ochraceous yellow instead of white or 

 grayish white. In size and cranial characters similar to deppei. 



Represented by six specimens, of which four are from Matagalpa, Feb. 

 1, and Sept. 1, 1907, and two from San Rafael del Norte, April 10, 1908. 

 They are all uniformly yellowish brown instead of rufous brown above, and 

 strongly ochraceous below. The fore limbs are grayish varying to deep 

 iron gray in some; the tail is washed lightly with white. 



41. Lutra latidens sp. nov. 



Type, No. 28435, & ad., Lavala, Matagalpa, Nicaragua, Oct. 28, 1907. 

 Distinguished from its near allies by large size, and especially by the massive 

 dentition. 



Pelage short and thin; color above dull rather dark uniform brown; below, 



