THE GREY PARROT AND THE CHIMPANZEE. 405 steppe and forest region. Joining this region, which harbours purely western and partly also southern species of plants and animals, is the district between the lakes, to a certain extent a neutral transition ground, where eastern and western varie-_ ties meet. The close affinity between the two regions will be best demonstrated by a short review of the most prominent animals peculiar to them.

Let us take first the grey parrot, Psitiacus erythacus, L., the northern limit of which passes right through our territory. From Usdga, where the bird is common, according to the assertions of the natives, it passes in a deep south-westerly curve round the large swamps in the north-eastern part of Unyoro, then bends farther northwards, and for the rest of | Unyoro remains at 2° N. lat., along which parallel it crosses the Albert Lake. After this, its northern limit is uncertain— we have here to deal with regions entirely unexplored—until it reappears in Monbuttu, and follows very nearly the course of the Bomokandi or Mayo, reaching the Welle-Makua at one point only, and crossing it where the large banana and oilpalm forests at the great bend of the river in the A-Madi district furnish a suitable abode. Beyond the mouth of the Bomokandi, it appears to advance much farther to the north, for Lupton Bey writes me that it is not uncommon in Dar-Abu-Dinga, and to the west of that place, that is, somewhere between 5°—6° N. lat. This accords with its appearance so far north as Lake Chad, where it has been caught by Denham. In this case also the line running from south-east to northwest is followed.

While it is definitely proved that the grey parrot reaches the Nile basin, as I have seen it frequently in Uganda and the adjacent countries, this is still an open question as regards the chimpanzee. Its existence in the country proper of the sources of the Nile is still problematical. All the more frequent is it in the basin of the Welle-Makua. Throughout Monbuttu and the wide A-Zandé district, wherever large stretches of forest or belts of wood afford sufficient space and suitable trees, the chimpanzee will not be sought in vain. It passes then far up northwards with the forests, and Dr. Junker reports that it is also common in the west, in the region of the A-Babta, for