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Show 314 MR. STANLEY S. FLOWER ON THE [Apr. 3, In reference to a quotation from a letter of mine in the P. Z. S. 1898, p. 924, " in Perak it (the Siamang) is found south of the Perak River, but not apparently anywhere north of it," M r . A. L. Butler writes to m e (dated Selangor, 30.5.99) saying: " Don't you get the Siamang on the (Larut; Perak Hills ? I shot one large male on Maxwell's Hill at 3000 ft., unless I am much mistaken. I did not preserve it, as I was not then collecting monkeys. Oddly enough I shot it in mistake, taking its head, which alone I saw, for a black squirrel sitting bunched up. This was a very large gibbon, entirely black, much bigger than Hylobates lar." N o gibbons are found wild in the islands of Penang or Singapore, though they are evidently very generally distributed over the mainland ; when met w^ith in the jungle it is very hard to identify the species, and it is but little use and cruel to attempt to shoot them with a shot-gun ; if a specimen be needed, kill it with a rifle-bullet. In September 1897, at the foot of Gunong Pulai in Johore, I saw both black and white gibbons of apparently the same species, but I cannot say which. In March 1897, near Tahkamen, Siam, there were many in the high trees in the thick jungle ; their call was loud and musical, " Pua, pua, pua, pua, pua, pua, pua, pua," beginning slowly and gradually getting faster. One morning w e followed up an individual for a long time; it was a very large black gibbon, extremely agile. Occasionally it progressed by running along the boughs, but generally by swinging by its hands ; every now and then it leaped down vertically to a great depth among the branches, as if falling, but it never actually came to the ground. In the forest of the Dong Phya Fai (between Ayuthia and Korat), at about 900 feet elevation, I have heard gibbons making a great noise in the early morning ; judging from the cry, I should say it was the same species as at Tahkamen. In January 1898 I was shown a live black-faced white gibbon at Chantaboon, said to have been caught in the neighbourhood, which I could not identify. Consul T. ff. Carlisle, writing to me from the Pailin Mines, Battambong Province, Siam, in Feb. 1899, says: " I have seen lots of gibbons round here, and have heard of a reddish-coloured one, but have never seen it." Very much remains to be done to get a definite knowledge of the species, varieties, and distribution in this region of these very interesting and attractive monkeys. Family CERCOPITHECIDAE. 6. MACACUS ASSAMENSIS McClell. The Himalayan Monkey. Macacus assamensis, Blanf. Faun. Ind., M a m m . p. 15. Blanford states there is in the British Museum a specimen, very probably of this species, from the Laos country in Upper Siam. Distribution. Eastern Himalayas, Assam, Upper Burma, Siam probably), Sandarbuns (?) |