When winter ended, the Lemhi population did not move far afield in search of subsistence, but hunted and awaited the spring salmon run in April. The Indians fished with harpoons, set basketry traps, and made fish weirs. Most fishing was done in the Lemhi River, but some families fished in the Pahsimeroi River, an affluent of the Salmon River which flowed west of and parallel to the Lemhi. Some fishing took place on the main stream of the Salmon River below its confluence with the Lemhi, but only harpooning was effective owing to the depth of the water. The weirs were put in the water each spring and dismantled in the fall and stored. Certain men were considered especially proficient in the construction and operation of fish weirs and assumed supervision over the operation. When the salmon runs had ended, many of the Lemhi people went to Camas Prairie. Some preferred to dig roots in the Lemhi country or to hunt deer in the ranges on either side of the valley. These hunting groups were quite small and usually numbered only two to four tipis. The sojourn on Camas Prairie lasted only about a month and the Lemhi people returned for the summer-fall salmon run. When this was over at the end of August, preparations were made for the trip to the buffalo country. At least three horses were required for the buffalo hunt: one for the hunter, another for his wife, and a third for packing purposes. Even this number was inadequate, since children also needed mounts and one pack horse was not enough to transport a good take of meat and hides. Also, the hunter should preferably have a specially trained buffalo horse, which he would ride only while the buffalo herd was being chased. While the Lemhi were richer in horses than were most Shoshone, some people were forced to stay at home. These hunted game in the mountains of the Lemhi region and adjoining areas on the Montana side of the Divide and depended to some extent on the largesse of the returning buffalo party. The buffalo hunters crossed the Divide through Lemhi Pass to the Beaverhead River and went out to the hunting grounds along the previously described routes. Our informants had no recollection of alliances with other Shoshone or with other tribes on the buffalo hunt except for one who said that the Lemhi Shoshone hunted with Nez Perce parties after an earlier period of hostility. At this earlier time the Nez Perce and the Flathead were said to have been enemies of the Lemhi people. Lemhi informants claimed that the buffalo parties usually succeeded in reaching winter quarters on the Lemhi River before the snows closed the passes. In view of Lewis and Clark's information and our data from Fort Hall, however, it might be supposed that they were often forced to remain in Montana for the winter. IV. ECOLOGY AND SOCIAL SYSTEM