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Show 616 ON A N E W MONKEY FROM SUMATRA. [Dec. 6, (in which the snout is proportionally longer) to the centre of the foramen incisivum. Intertemporal constriction strong ; it equals the distance from the foramen magnum to the centre or binder edge of nv^ The nasals are slender and straight, or even somewhat concave ; above them the interorbital space is sunk inwards. The bailee are low, almost flattened in the female, but rather more elevated in tbe old male. The canines in the male are particularly long. The lower jaw is almost uniformly high throughout its length from p^ to rm3. The occipital is strongly rounded behind, and does not show a trace of any transverse crest. The orbits are wide, with a distinct angle above on the outer side ; their height is less than their breadth. In the young one the peculiarities of the skull are still but little prominent. The bullce are proportionally more swollen than in the old ones. Habits.-These Monkeys were only met with by Herr Iversen in the Langkat district, and were not observed in Deli. They were fairly numerous on several of the estates, especially at Glen Bervie and Bekri. Their haunts were in the highest trees, and they never descended of their own accord to the ground or visited the rice-fields. Herr Iversen saw, however, one wounded individual take to flight on the ground. They always live in companies, and inhabit the dry spots in the thickest parts of the forests. They appear to be non-migratory, and may be met with at all times of the year in almost the same parts of the forest. They hardly ever visited the more open places, but kept to the highest tree-tops, where they moved about with the greatest ease, and made the most astonishing leaps through the branches. They were on the whole excessively shy; if they found themselves noticed, they endeavoured at once to hide themselves, and the mothers would leave their young sitting on the branches whilst they themselves sought shelter in the tree-tops. When hunted, they all took to flight in the same direction, so that the companies were not dispersed. The companies appeared to consist chiefly of full-grown individuals, and young ones were but seldom seen. An occasional half-grown individual, however, might be noticed following the old ones ; babies were not often seen, but these are, on the whole, more difficult to observe, as they are carried by the mother under her belly. The young one brought home was noticed through the mother deserting it, after which it began to shriek. They have a very penetrating cry, which they generally utter in chorus after one has given the note. In the individuals which have been examined no foetus has ever been found. Possibly the pregnant females and the younger ones hide themselves more closely. They were seen in activity only in the daytime, and were not heard to cry at night. They lived, it appeared, only on fruits. In their stomachs was chiefly found the soft pulp of a fruit belonging |