The southern and southeastern limits of the Shoshone range in Wyoming are most vague. They probably extended as far south as the Yampa River in Colorado and the Uinta Range in Utah; Lander places their southern limits at Brown's Hole, in northwestern Colorado on the Green River (Lander, 1860, p. 121). It is doubtful whether the country as far east as the North Platte and south to the Yampa was intensively exploited. Informants knew of no significant activities which went on in those areas, although they thought that antelope were occasionally hunted there. Most agreed that the Sweetwater River and Rawlins, Wyoming, were in Shoshone country, but Casper, Wyoming, and the Medicine Bow Mountains were excluded. Shimkin's map shows no regular utilization of the southeastern corner of Shoshone country (Shimkin, 1947_a_, map 1, p. 249), although my informants spoke of antelope hunts on the south side of South Pass. We can conclude that this whole area was, like many other sections, an area of occasional penetration. It is doubtful whether the poorly watered country between the Green and North Platte rivers was intensively used by any Indian group. SOCIAL AND POLITICAL ORGANIZATION A good deal of Eastern Shoshone social organization has already been described in the section on the subsistence cycle and in the context of historical data. Although the summer was spent in scattered groups, the collective buffalo hunt and the large winter camp made these Shoshone among the best organized of all the Shoshone population. Horses, a richer game supply, and the constant need for protection caused the Eastern Shoshone to travel in much larger groups than those of Nevada and perhaps also of Idaho, and leadership was, correspondingly, more highly developed. We hear early of the "'Horn Chief,' a distinguished chief and warrier of the Shoshonee tribe," who was frequently encountered in the Bear River region (Ferris, 1940, pp. 71-73). Ferris also tells of two other Shoshone chiefs, but does not localize them or their following (p. 309): The principal chief of the Snakes is called the "_Iron Wristband_," a deceitful fellow, who pretends to be a great friend of the whites, and promises to punish his followers for killing them or stealing their horses. The "_Little Chief_" a brave young warrior, is the most noble and honorable character among them. Ferris also mentions a Shoshone leader named "Cut Nose," who, he said, assumed white dress and left the tribe (p. 310). During the 1840's the name of Washakie is mentioned with increasing frequency in historical sources and thereafter this chief overshadows all other leaders. We first hear of him from the trapper Russell who recorded a conversation at Weber River, Utah, in which the Shoshone leaders were discussed (Russell, 1921, pp. 114-116).