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



outward. The dorsal outline of the skull is much as in Artibeus jamaicensis jamai- 

 censis; but the skull is narrower, and the dentition heavier, especially the upper 

 incisors. 



Represented only by the type, from Matagalpa. A well defined form, 

 recognizable by its small size, and by the narrow, elongated form of the skull 

 and low cranium. 



55. Desmodus rotundus (Geoff roy). Two specimens, Volcan de 

 Chinandega, May 6 and 9, 1907. 



56. Molossus rufus Geoffroy. One specimen, Volcan de Chinandega, 

 May 11, 1907. 



57. Cebus hypoleucus (Humboldt). Four specimens, 2 males and 2 

 females, all adult, and the skull of another specimen, taken at Lavala, Oct. 6, 

 1907, Chontales, Feb. 18, and Ocotal, May 11, 1908. 



58. Ateles geoffroyi Kuhl. Four specimens, three old females and 

 a nearly adult male, Lavala, Oct. 2 and 8, Tuma, Nov. 29, and Uluce, 

 Dec. 3i, 1907. 



59. Alouatta palliata matagalpse subsp. nov. 



Type, No. 28426, cT ad., Lavala, Nicaragua, Oct. 13, 1907; William B. Richard- 

 son. 



In size similar to A. palliata palliata and A. palliata mexicana, but quite different 

 in color from either, the flank stripes being dark rufous instead of pale rufous or 

 golden (palliata), or pale fulvous or grayish fulvous (mexicana); suffusion of back 

 dark rufous instead of fulvous or grayish fulvous. 



Type, total length, 1120 mm.; tail vertebra, 620; hind foot, 145. Skull, total 

 length, 107; condylo-basal length, 92; basilar length, 85; zygomatic breadth, 76. 



Two specimens, both males, one adult, the other not fully mature, 

 Lavala, Oct. 13, 1907. These specimens differ markedly in color from any 

 in a large series from Panama, and are equally different from any in a con- 

 siderable series from Vera Cruz, Mexico, and are not intermediate between 

 them, being very unlike either in the rufous suffusion of the lower back and 

 the dark rufous of the flank stripes. 



