The ‘_Thomsoni_’ in habits is very like the _G. Grantii_, but as a rule is found in rather larger herds. Single bucks of this species are, however, more often seen than single _Grantii_ bucks. 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. A _Thomsoni_ 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 places. 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 head-waters of the Tsavo. I saw none at Njemps near Lake Baringo, or in Turkwel and Ngaboto in the Suk country, though _G. Grantii_ was plentiful in all these places. PETERS’ GAZELLE _Gazella Petersi_ (known to the Swahilis also as ‘Sala’) may be a local variety of _G. Grantii_ rather than a distinct species. It used to be plentiful at Merereni on the coast, and is still found further inland in the Galla country. It is certainly a smaller beast than _G. Grantii_ from Kilimanjaro or Machako’s, but in other respects is almost identical, excepting in the shape and size of the horns, which I have never known to exceed 22 ins. in length measured along the curve. Their horns are also straighter, and have not nearly such a pronounced backward curve as those of the _Grantii_, neither do they diverge towards the points so much, being rarely more than seven or eight inches apart at the widest parts. _G. Petersi_ is found in the small open plains and open scrub. ABYSSINIAN ORIBI The Abyssinian Oribi (Swahili, ‘Taya’) is, I believe, not found to the south of Upper Kavirondo. Between the river Nzoia and the base of Mount Elgon it is fairly plentiful, as also in Turkwel. In habits it differs from its East African congener in one respect only, not appearing to be so partial to long grass, but being confined more to rough stony ground and short scrubby bush. This gives the sportsman a chance of seeing it at a distance, and an opportunity of stalking it which the oribi of the coast very rarely affords, unless the grass in which they usually lie has lately been burnt. EAST AFRICAN ORIBI