With the Viader and Abella diaries the formal documentary descriptions of Costanoan people and territory east of San Francisco come to an end. Nevertheless, there are certain other sources which convey information of use to the ethnographer. These are, first, some of the accounts left by travelers, particularly those by Chamisso and Choris in 1816 (translated by A. C. Mahr, 1932); second, the vocabularies and discussion of linguistics written by Fray Felipe Arroyo de la Cuesta (1837); third, the transcripts of the Mission baptism books made by Pinart (no date); forth, the accumulated habitation site records of the California Archaeological Survey. These sources will be used here for further examination of the location of the aboriginal groups concerned and their population. LOCATION The subordinate divisions of the natives inhabiting Alameda and Contra Costa counties can probably be allocated to five primary geographical areas. Some of these can be associated with reasonably well recognized names; some cannot. They may be briefly considered. _Area 1. The Alameda._--From Milpitas north to approximately Richmond, and west of the hills, the early expeditions (Fages, Anza) found numerous rancherias, as previously mentioned. The Sal-Danti party in 1795, covering the southern half of this area thoroughly, found almost no native inhabitants. An originally fair-sized population therefore must have been dispersed nearly completely in twenty years. No general, regional name was ever applied to these Indians, but a few individual rancheria names have been preserved. These are all designated in the San Francisco Baptism Book as lying on the "otra banda del estero" (or some similar expression): 1778: paraje Halchis 1779: paraje Chapugtac paraje Tupucantche 1780: rancheria Genau (or Chynau) rancheria Tupine 1780: rancheria Itenau rancheria Tumiamac 1781: rancheria Torqui 1782: rancheria Putnatac rancheria Ocquizara rancheria Tacomui 1784: rancheria Ssichitca araje Cosopo 1786: rancheria Ilorocrochay paraje Guet These records show, first, that from 1778 to 1786 the missionaries from San Francisco recognized fifteen inhabited places along the southeast shore of the Bay. Second, it is very clear that active search for converts was proceeding during these eight years Finally, the field must have been substantially exhausted because none of the fifteen localities are noted after 1786.