256 APPENDIX 
rounded; nasals broader and longer; mandible much heavier, the 
ascending ramus much broader at line of tooth row, being 13.1 mm. to 
11.5 of GZ. GEoFFROyYI, with the angle more prominent. The orbits are 
much wider the outer dimension across both being 27.5 for the present 
species to 25.4 for C#. GEOFFROYI. 
The present species was procured by Mrs. E. L. Kerr, (who also 
discovered the striking SENIOCEBUS METICULOSUS lately described) in 
the forest of the River Salaqui, among the coast mountains of north- 
western Colombia. It would appear to be a larger animal than its 
relative from Costa Rica and Panama. It is not probable that the 
ranges of the species approach each other, as the Salaqui River is a 
considerable distance to the south of the northern border of Colombia. 
GENUS CERCOPITHECUS. 
CERCOPITHECUS MIDAS EGENS (Thomas). 
Leontocebus midas egens Thos. Ann. Mag. Nat. Hist., 8th Ser., X, 
1912, p. 44. 
Type locality. Obidos, Lower Amazon. Type in British Museum. 
Genl. Char. Similar to C. MIDAS. 
Color. “Back more strongly suffused with dark buffy, generally 
throughout, and in all cases across the shoulders. Black of the head 
less deep and less continued down on to the back, the grizzled buffy 
of the back going further forward on the nape. Hands instead of 
being wholly ‘ochraceous’ or ‘ochraceus buff,’ only of this color on 
the outer half of the wrist, the metacarpus and digits being decidedly 
lighter colored, ‘buff’ or ‘cream buff.’ Feet also rather lighter than in 
midas, though the difference is less conspicuous.” 
Measurements. “Head and body, 229; tail, 384; foot, 65; ear, 40.” 
(Collector). “Skull: greatest length, 49.5.” 
I have not seen this specimen. 
