Abstract
In the course of investigations started in June, 1952, on the biology of the Gold Coast monkeys, the writer has made an attempt to plot the geographic distribution and limits of all the forms that include that country in their range. The results obtained indicate that the commonly accepted nomenclature of certain forms within the genera Cercocebus, Cercopithecus and Colobus fails to give a true picture of their specific or infraspecific status. The present investigations on the mona monkeys in the field have been sufficiently interesting to lead to a systematic study of the treatment of the entire mona group, Cercopithecus mona subspp. of Schwarz (1928a, b).

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