GUEREZA

guereza, the native name of a long-tailed, black and white abyssinian monkey, _colobus guereza_ (or _c. abyssinicus_), characterized by the white hairs forming a long pendent mantle. other east african monkeys with a similar type of colouring, which, together with the wholly black west african _c. satanas_, collectively constitute the subgenus _guereza_, may be included under the same title; and the name may be further extended to embrace all the african thumbless monkeys of the genus _colobus_. these monkeys are the african representatives of the indo-malay langurs (_semnopithecus_), with which they agree in their slender build, long limbs and tail, and complex stomachs, although differing by the rudimentary thumb. the members of the subgenus _guereza_ present a transition from a wholly black animal (_c. satanas_) to one (_c. caudatus_) in which the sides of the face are white, and the whole flanks, as well as the tail, clothed with a long fringe of pure white hairs.