THE GUENONS. 43 



making grimaces. The latter habit is so characteristic of them 

 that they have obtained from it the name of Gue?ion, by which 

 they are now so generally known, bestowed on them by the 

 French. Their food consists of leaves, birds' eggs, and honey, 

 but pre-eminently of fruits, while they are especially destruc- 

 tive to the ripe grain-fields of the natives near the woods in 

 which they live. They feed voraciously, and carry off all that 

 their cheek-pouches can hold, even after they are satisfied, or if 

 they are called off by the warning cry of the sentinel, who is said 

 to be always placed on guard on some point of 'vantage when 

 the troop is busy with its depradations. The Guenons are not 

 only restless, but very inquisitive; they are, therefore, when 

 young, very easily tamed, and as a consequence they are fre- 

 quently to be seen as performers in circuses and exhibitions. 

 When aged they are unreliable in temp.r, and often very ill- 

 dispositioned. They are said, also, to repel with missiles any 

 intruders into the region in which they are established in any 

 numbers. 



The known species— numbering about forty — have for the 

 purposes of description and easy subsequent discrimination, 

 been arranged into groups (based on a few of their more or 

 less prominent characters) by different zoologists. Of these 

 M. Isidore Geoffroy St. Hilaire, of Paris, and Professor 

 Schlegel, of Leyden, may be specially mentioned ; the arrange- 

 ment of the latter forming a very convenient key for the 

 determination of the species. Among the zoologists who have 

 more recently revised this genus is the well-known Secretary of 

 the Zoological Society of London, Dr. P. L. Sclater, who has 

 to some extent followed and improved upon Professor Schle- 

 gel's arrangement of the genus. In the present review, there- 

 fore, of the numerous species of this genus, the six groups 



