| Tribe or Group | Date of Conversion | Baptisms |
|---|---|---|
| Cosumnes (Tribelet) | 1826-1836 | 84 |
| Junisumne (Anizumne, Unsumne) | 1813-1834 | 363 |
| Lelamne (Llamne) | 1813-1836 | 128 |
| Gualacomne | 1825-1836 | 158 |
| Amuchamne (Mackemne) | 1834-1835 | 13 |
| Sololumne | 1828-1834 | 6 |
| Locolumne | 1826-1834 | 52 |
| ——— | ||
| Total | 804 |
If we apply the general principle used with the delta groups and double the baptism number, the population becomes 1,608, a figure which is much too low. The Lelamne, with 128 baptisms, comprises the group attacked by Soto in 1813, at which time we have estimated that there were four villages of 475 persons each involved in the battle. This calculation implies a total of 1,900 for the Lelamne alone. On the other hand, the account is not entirely clear as to whether or not there were members of the Cosumnes tribelet concerned. If so, we may be dealing with both the Lelamne and adjacent neighbors who were designated locally Cosumnes. If we include the baptisms of all those under both names, we have 212. Furthermore, the Junisumne (or Unsumne or Anizumne) were often confused with the Cosumnes. If the 363 baptisms listed under the Junisumne are added we get 575 and, multiplying by 2, the population of the three divisions collectively would have been 1,150. This estimate also appears too small and leads to the conclusion suggested above on historical grounds that a baptism factor valid for the delta would not be applicable to the Cosumnes group as a whole.
Another documentary source is of interest in this connection. This is the account by José Berreyesa in 1830 (MS) of an affray along the lower Sacramento River in which Americans participated under Ewing Young. Christian fugitives from the missions had been protected by the Yunisumenes (Junisumne), who had joined with the Ochejamnes. They were opposed by the Mexicans and their allies, the Sigousamenes (Siakumne), the Cosomes, and the Ilamenes. These last tribes had gathered an army of 450 "Gentiles auciliares." The Yunisumenes, Cosomes, and Ilamenes are, of course, precisely the three subtribes discussed in the preceding paragraph. Now if the Sigousamenes, Cosomes, and Ilamenes contributed 450 men collectively, they each may be considered to have furnished 150 men. Since the opponents were fairly well matched, it is likely that the Yunisumenes supplied a similar number. We can assume that for routine fighting of this sort, particularly where two of the tribelets were ranged with the Mexicans instead of against them, the armies included no more than the strictly military population, or not in excess of half the males over the age of ten years. Hence, if the sex ratio was unity and the young children constituted approximately 15 per cent of the population, the aggregate number of the three subtribes would have amounted to 1,920, or almost the same as was estimated from the Soto report in 1813 for the Lelamne (Ilamenes) above, or perhaps the Lelamne augmented by some of the Cosumnes tribelets or subtribes. The Berreyesa episode occurred in 1830, after all these groups had suffered twenty years of attrition owing to perpetual minor warfare, disease, and starvation. Hence the population of the three tribelets jointly, Junisumne, Cosumnes, and Lelamne, must have reached fully 3,000 in 1813. The baptism factor, consequently, would not have been 50 per cent, but 575 divided by 3,000, or 19.2 per cent.
Three other villages or tribelets which can be identified in the mission records as being closely associated with the Cosumnes are the Amuchamne, Sololumne, and Locolumne. The first two probably correspond to Merriam's Oo-moo-chah and So-lo-lo, which in later times at least were rancherias. Assuming all three to have been villages, we may consider that each contained an average number of 300 inhabitants. The respective baptism numbers were 13.6, and 52. In relative terms the baptisms amounted to 4.3, 2.0, and 17.3 per cent.
The last division listed above is the Gualacomne, synonymous with Merriam's Wah-lah-kum-ne. Merriam (Mewko List, MS) places them between the lower Stanislaus and the Tuolumne rivers, but quotes Hale, who saw them in the 1840's, as saying that they lived on the lower east side of the Sacramento River. Hale's statement is strongly supported by the fact that they appear in J. A. Gatten's census of 1846 (MS, 1872). Gatten ennumerated only the tribes along the lower Sacramento. Whether the Gualacomne can be affiliated with the Cosumnes ethnically is doubtful but it is reasonable to include them with this group demographically.
Of the Gualacomne 158 were baptized in the missions. That the group was fairly large is attested by the fact that Gatten reported, under the name Yalesumne, that 485 were alive in 1846, Since no open valley group could possibly have retained more than one-third of its former members in 1846, it does not seem excessive to ascribe 1,455 persons to the tribelet. The baptism factor is 10.8 per cent, and the average of the five values secured with the Cosumnes group is 10.7, or, let us say 10.0 per cent. The total population on the lower Cosumnes and adjacent Sacramento rivers, according to the discussion above would be 5,355 souls.
We may approach the problem from a different direction if we start with the villages compiled by Merriam (1907, p. 349). He mentions sixteen villages on the Cosumnes River system from Sloughhouse nearly but not quite to the Sacramento. It is extremely probable that there were other villages on the Sacramento River itself. Nevertheless, let us take Merriam's list as it stands. The upper seven villages lie between Sloughhouse and the junction of the Cosumnes River with Deer Creek, the remainder below that point. Of the lower nine we may consider that four correspond to those seen by Soto, which were quite large. It was estimated that they contained 475 persons apiece. The other five lower villages, although perhaps not so populous, must have held fully 300 inhabitants each. The upper seven were no doubt smaller but still should have reached the values given by Moraga for similar stretches of the Tuolumne and Merced, i.e., approximately 250 persons. The total would then come to 5,150, very close to the previous estimate. It will be both adequate and conservative to establish the population at 5,200.
Cosumnes group ... 5,200
The Moquelumne group.—Here are included the Indians living on the lower course of the Mokelumne River, the Calaveras River, and the plain between the two. Five tribes mentioned by the Spanish writers fall within this category: the Moquelumnes, the Siakumne, the Passasimas, the Yatchikumne and the Seguamne. The exact territorial status of these tribes has been a subject of considerable disagreement among ethnographers.
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.