23O SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



same connection points out the great range of individual variation in 

 color. The howlers of the mainland of western Panama seem 

 referable to A. p. inconsonans, but in cranial details indicate grada- 

 tion toward typical A. p. palliata. Anthony (1916, p. 374) says: 

 " This monkey was noted the oftenest because of its far-reaching 

 call-note. It seemed to be everywhere common from the Zone up to 

 the crests of the cordillera." He lists specimens from Cituro, Maxon 

 Ranch (Rio Trinidad), Tacarcuna, and Tapalisa. 



Specimens examined : Boqueron, 2 1 ; Boquete, 5 2 ; Cerro Azul, 9 ; 

 Cituro, I *'; " Gulf of Panama," 1 3 ; " Isthmus of Panama," 1 3 ; 

 Maxon Ranch (Rio Trinidad), 1 1 ; Mount Tacarcuna, I 1 ; Tapa- 

 lisa, I. 1 



ALOUATTA COIBENSIS Thomas 

 Coiba Island Howling Monkey 



Alouatta palliata coibensis Thomas, Novitat. Zoologies, Vol. 9, p. 135, April 

 10, 1902. Type from Coiba Island, Panama. 



The Coiba Island howling monkey was originally described as 

 "a small insular race of the continental A. palliata Gray. The 

 Howler Monkey of Coiba appears to have been reduced in size by its 

 insular habitat in a way that the Cebus has not, for the latter is fully 

 as large as its brethren on the mainland." The following remarks by 

 Alston (1879, p. 4) doubtless apply to this form: " Mr. Salvin tells 

 me that Captain Dow informed him that he once met with Howling 

 Monkeys on the little island of Hicaron, which lies at the southern 

 extremity of Quibo [Coiba] Island, off the coast of Veragua. The 

 species would probably be M. palliatus; but it is difficult to under- 

 stand how the founders of the colony could have reached this iso- 

 lated spot from the mainland." Three specimens from Coiba Island 

 collected by J. H. Batty indicate such disparity in size compared 

 with the allied howler inhabiting the adjacent mainland that it 

 seems best to regard it as a distinct species. 



Specimens examined : Coiba Island, 3. 1 



Family CEBIDAE. Capuchin Monkeys 



The restricted family includes the capuchin monkeys of the genus 

 Cebus, some of whose distinguishing characters are given below. 



Genus CEBUS Erxleben. Capuchin Monkeys 

 The monkeys of the genus Cebus are medium-sized species, readily 

 distinguished in Panama by the white face, chest, and shoulders 



1 Collection Amer. Mus. Nat. Hist. 



3 Three in collection Mus. Comp. Zool. ; two in Amer. Mus. Nat. Hist. 



* Collection Mus. Comp. Zool. 



