78 CEBUS 



b." Crown black, cheeks whitish. 

 a."' Arms to elbows white. 



a.* Chest white C. capucinus. Q C^^-^- 



6.* Chest black C. c. nigripectus. f' C 



c." Crown black, cheeks pale yellow C. frontatus. 4^ 



d." Crown white C. albifrons. ,v-«. 



e." Crown pale brownish yellow tinged 



with reddish C. unicolor. R "^ -«.i. 



/." Crown dark chestnut C. u. cuscimis. 0.^<-'?~<-6 



g." Crown golden brown C. Havus. ",-■-( 'T 



b. Arms with yellow. 



a.' Arms to elbows, and shoulders golden 



yellow C. castaneus. 



b.' Arms to elbows yellowish white C. variegatus. t^X^ > ^^'' 



c' Arms to wrist on outer side pale yellow. 



a." Upper parts mummy brown C. malitiosus. ' — ^ 



b." Upper parts cinnamon red C. chrysopus. ■ . 



c." Upper parts blackish brown C. apiculatus. 



B. Heads with tufts or ridges on male. 



a. No white hairs on body. 

 a.' Arms with yellow. 



a." Dorsal region dark yellowish brown.. C. /j6irft«0JMJ. ; '^' 



b." Dorsal region reddish chestnut C. fatuellus. .-Yy^r»-«-f^*w 



c." Dorsal region reddish golden ^ 



brown C. rnacrocephalus^- '■ '^^^^ ^ 



b.' Arms without yellow. 



a." Arms to elbows cream buff C. vcrsuta. 



b." Arms to elbows reddish chestnut.. C. /. peruanus. 



c." Arms to elbows dark Prout's brown. 



a."' Black cap on head C. azarcc. I tvv> /'' ' 



b.'" Black cap divided nearly into two. C. 0. /'a//i<fM.f. ' •<" '^v^ 



d." Arms to elbows black. 



a."' Upper parts mummy brown C. cirrifer. ■■-'^ > '^' 



b."' Upper parts chestnut red C. cassiceps. "?' 



e." Arms to elbows golden brown tinged 



wMth red C. caliginosus. 



b. White hairs on body C. vellerosus. 



Cebus apella (LiniiEeus). 



Simia apella Linn., Mus. Reg. Ad. Fred., 1754, Quad., p. 3, pi. I ; 

 Id. Syst. Nat, I, 1758, p. 28; I, 1766, p. 42; Bodd., Elench. 



