For the Witukomnom Foster lists 15 places, of which 9 are designated as nohots and 6 as "small." Two points are apparent. First, the informants of Foster were recalling the _important_ villages which they had seen or been told about but had forgotten the minor sites, hence the great preponderance of nohots. In the second place, it is unnecessary for purposes of calculation to know the names or the number of the peripheral "parasitic" rancherias if we know the primary towns, the nohots, for, knowing a nohot, we know a community. Thus we may immediately set the population of the Witukomnom as at least 1,710 persons. If the informants gave incomplete data, then the number would be higher. For the Ukomnom Foster lists 38 place names, most but not all of which lay in Round Valley. Of these 6 are specified as nohots. This would yield as a first approximation a population of 1,140. But for the Ukomnom we have some help from Kroeber. Many of Foster's remaining places are designated merely "rancheria," since his informants could remember no further details. For one of them, Kroeber says that there was a dance house present, which makes the site a nohot instead of a rancheria. Kroeber's group B includes the village of Pomo, which is not mentioned by Foster. This was the seat of a head chief, and therefore a nohot. In addition, Kroeber includes in this group 6 villages in Williams Valley. Foster says regarding "Flint Valley," by which he is evidently referring to the same locality, that his informants could remember no villages. This seems to be an instance where Kroeber's earlier informants could recall villages which Foster's later ones had forgotten, for there is no ground for doubting the accuracy of Kroeber's work. There is no implication that any of these sites was large, hence they may be regarded as the small type of village with about 25 persons apiece. We can therefore count 8 nohots plus 6 rancherias, which gives a population of 1,670 for the entire group. A further check on the Ukomnom is provided by Foster's map of Round Valley (p. 158). In the valley proper he shows 37 inhabited villages, of which 25 are named and 12 are unnamed. Of the former, 7 are known to have been nohots. Taking the nohots at 90 persons and the other sites at 25 persons, one gets a total population of 1,380. A balance of 300 is by no means excessive for Williams Valley and the peripheral hills. Incidentally, this figure for Round Valley yields a density of roughly 45 persons per square mile, one which surpasses any other in California but one which is quite in accord with all the accounts of early settlers and explorers.