ARCTOCEBUS 35 



GENUS 3. ARCTOCEBUS. THE ANGWANTIBO. 



1.2=5; C. iin; P. 3^; M. 3— 3 = 36. 



ARCTOCEBUS Gray, Proc. Zool. Soc. Lond., 1863, p. 150. Type 

 Perodicticus calaharensis Smith. 



Body rather slender : head oval ; muzzle blunt, dog like : eyes 

 large; lower phalanges of hands and feet, except of thumb, united in 

 the skin; two upper joints free; index finger reduced to a tubercle, 

 without a nail. Limbs subequal, the hind ones being slightly longer 

 than the fore limbs. The feet are larger than the hands ; the great toe 

 has a rather large fleshy tubercle at its base on the inner side, and is 

 opposable to the other toes ; the nails are thin and flat except that of 

 the second toe which is like a claw, being thin, convex and acute. 

 Ears erect; two transverse ridges lie above the auditory meatus, with 

 fine hairs on the inner margins standing upright. Unlike the species 

 of the genus Perodicticus, the processes of the cervical vertebrae 

 do not project through the skin. Tail rudimentary. Anterior upper 

 molars with four cusps, and oblique ridges ; last upper molar with 

 three cusps ; last lower molar has five cusps. The species of this genus 

 are nocturnal in their habits and move about but seldom during the 

 day, and it is on this account, probably, that hardly anything has been 

 recorded of their mode of life. 



KEY TO THE SPECIES. 



A. Great toe opposable and with a tubercle at base. 



a. General color dark brown A. calaharensis. 



b. General color bright golden red A. aureus. 



ARCTOCEBUS CALABARENSIS (Smith). 



Perodicticus calaharensis Smith, Proc. Roy. Phys. Soc. Edinb., 

 1860, p. 172, figs. 1, 2; Matschie, Mitth. Geog. Ges. Natur. 

 Mus. Liibeck, 1894, p. 132, fig. ; Forbes, Handb. Primates, I, 

 1894, p. 27; Forsyth Major, Proc. Zool. Soc. Lond., 1901, p. 

 136. 



