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Show 442 MR. p. L. S C L A T E R O N T H E [May 2, referred to the same group, but is easily distinguished from it several characters. In the first place the pure white nose and upper lips, which are very noticeable in the male specimen last received (see figure), separate it at once from G. albogularis, in which, as will be seen by the skin now exhibited, there is no Cercopithecus boutourlinii, from a photograph of the stuffed specimen received in 1889. trace whatever of this colour. This feature is so prominent that it would almost justify the removal of the species to the " Spot-nosed" group of m y arrangement (see above p. 244). But in most respects C. boutourlinii agrees better with C. albogidaris and the other species of m y section D, M E L A N O C H I R I . Another point in which G. boutourlinii differs from G. albogularis is the black belly and much blacker limbs. In G. albogularis the belly is pale grey, and the external surface of the limbs is of a dark grey, more or less annellated. Again, C. albogularis is a short- |