“In habits _G. thomsoni_ is very like _G. granti_, but, as a rule, is found in rather larger herds. Single bucks of this species are, however, more often seen than single bucks of _G. granti_. At Lake Naivasha, in July 1890, I saw a large herd of some sixty head, composed entirely of does, and in the same place, in September of the previous year, I saw a herd of some thirty or forty beasts, every one of which was a buck; but I do not think that this can be taken as evidence that the bucks and does separate at certain seasons of the year, as on the same days on which I saw these two herds I also saw others in which the bucks and does were together. Thomson’s Gazelle is a confiding little beast, and, except in places close to a well-beaten caravan-route, where it has been constantly shot at, can be easily approached within 120 yards with ordinary care and perseverance, even in the most open and covertless spots. These beasts appear to be confined almost entirely to the Masai country, as I have not heard of their having been seen east of the Sigarari plains to the south of Kilimanjaro, or south of the Useri river and the headwaters of the Tsavo. I saw none at Njemps near Lake Baringo, or in Turkwel and Ngaboto in the Suk country, though _G. granti_ was plentiful in all these places.” Writing subsequently in the Zoological Society’s ‘Proceedings’ on the Antelopes of the Mau District of British East Africa, Mr. Jackson says that this Gazelle does not, as he believes, extend beyond a few miles north of Lake Nakuru. He adds that “the females are _horned_, whatever may be said to the contrary.” With this view Mr. Arthur H. Neumann, one of our most recent explorers in British East Africa, quite agrees. In his lately published volume on ‘Elephant-Hunting’ in that Protectorate, Mr. Neumann gives a figure of the head of a female Thomson’s Gazelle, which, by his kindness and that of his publishers, Messrs. Rowland Ward & Co., we are enabled to reproduce (fig. 75, p. 174): this shows that the horns are present in that sex of _G. thomsoni_, though in a much more dwarfed condition than in most of its allies. Mr. Neumann also claims to have met with this Gazelle much further north than its range is usually held to extend. This was in the district of Kisima, south of the Lorogi Mountains and north of Lake Naivasha. Col. Lugard, who has had great experience in East-African game-shooting, has stated[15] that he had never met with a horned female of Thomson’s Gazelle. A letter lately received from our much-valued correspondent, Mr. S. L. Hinde of the B.E.A. Medical Service, in response to enquiries on this point, endeavours to explain this diversity of opinion as follows:--