The original Moquelumnes of the Spaniards were undoubtedly located on the Mokelumne River itself from Campo Seco nearly to the junction with the Cosumnes at which point they adjoined the Cosumnes tribe. According to George H. Tinkham, in his History of San Joaquin County (1923), they extended in a north-south direction all the way from Dry Creek to the Calaveras River, but by the middle of the nineteenth century they may have spread out from their original habitat. The Yatchikumne are shown by Schenck as filling the space between the lower Mokelumne and the lower Calaveras and extending westward to the San Joaquin River. Merriam (Mewko List, MS) quotes F. T. Gilbert to the effect that they occupied the Mokelumne River basin, but if they did so, it was because of the displacements during the mining era. The Passasimas are placed by Schenck on the left bank of the Calaveras River at, and for several miles upstream from, its junction with the San Joaquin River. The Siakumne and the Seguamne are subject to some confusion. This difficulty arises partially from the similarity in name. The Siakumne are called Si-a-kum-ne by Merriam and Sakayakumne by Kroeber. In Gatten's census of 1846 they appear as Sagayakumne. In the San Jose baptism book we find Ssicomne, Zicomne, Siusumne, and Sigisumne. The Seguamne, on the other hand are designated Seguamnes and Saywamines by Merriam and Sywameney or Seywameney by Sutter in his New Helvetia Diary (1939). Gatten calls them Sywamney. They appear in the San Jose record as Secuamne, Seguamne, Seyuame, and other variants. The Siakumne lived somewhere between the Calaveras and Stanislaus rivers according to Merriam, who places one of their villages at Knights Ferry on the Stanislaus. Schenck doubts Merriam's location and Kroeber puts the rancheria Sakayakumne as far north as the Mokelumne. Sutter (1939, p. 88) says that some of these people came to work for him, an unlikely event if they had been living as far away as the Stanislaus. It is probable that the lower Calaveras River is as close as we can place them. The Seguamne are not mentioned at all by Schenck. Merriam (Mewko List, MS) says they were a "tribe or subtribe on E. side lower Sacramento River" and may have been a subtribe of the Bolbones. Sutter and Gatten both refer to the tribe, and the sphere of activity of these men did not extend much below the Sacramento River itself. Hence, although there are grounds for including the Seguamne with the Bolbones or the Cosumnes, no serious error will be committed by placing them in the Mokelumne group.