THAYER AND BANGS: VERTEBRATA OF GORGONA ISLAND. 91 



PHYLLOSTOMATIDAE. 

 3. Micronycteris megalotis Gray. 



One adult ^ . June 28. 



4. Dermanura rava Miller. 



One male, July 1st. 



CEBIDAE. 



5- Cebus curtus, sp. nov. 



Type. — Mus. Corap. Zool., No. 10,824, adult ^, Gorgona Island, July 2, 1904. 



Two specimens, ^ 9 July 2, 1904. 



CluwMters. — A small, short-tailed island form, related to C. hypoleucus 

 (Humbt.). Similar in color to G. hijiMeucus, — black all over except head, 

 under surface and sides of neck and shoulders, which are white in the male and 

 Isabella color in the female. Differs from C. hypoleucus in being smaller; tail 

 very jnuch shorter; hands, feet, and limbs shorter. Skull smaller and nar- 

 rower, especially so across the orbits and just behind them. 



Measurements — 



No. Sex. Total length. Tail vertebrae. Hind foot. 



10.824 $ ad. 753 420 115 



10.825 9 young ad. 753 420 112 



Skull. — Type, adult $ : Basal length, 69; occipito-nasal length, 80.4 ; zygo- 

 matic width, 58.4; mastoid width, 48.2: width across orbits, 49.2 ; least width 

 behind orbits, 38.4 ; length of palate to palatal notch, 33.6 ; palatal notch to 

 foramen magnum, 28 ; upper tooth row, canine to last molar, 25 ; length of 

 mandible, 58 ; lower tooth row, canine to last molar, 28. 



Eemarks. — The monkey of Gorgona Island is a well-marked species, differing 

 greatly from Cebus hypoleucus in its very short tail, and much smaller hands and 

 feet. The limbs, also, judging from skins made in the same way, appear to be 

 very short, and the skull shows characters by which it can be separated from 

 that of C. hypoleucus. 



It was not uncommon in the forest, but was hai'd to reach owing to the 

 denseness of the jungle. 



IV. AvEs. By Johx E. Thayer and Outram Bangs. 



The paucity in the ornis of Gorgona Island is well shown by the fol- 

 lowing list of sixteen species. Mr. Brown took examples, during his stay 

 of two weeks, of but fourteen species, and of these several are represented 

 by only from one to three individuals each. The small amount of prepa- 

 ration gave Mr. Brown more time for field work, and he tells us he often 



