If the Aguastos extended from Richmond to Crockett or thereabouts, they were Costanoan and strictly bay people; hence not pertinent to this study. If they lived along Suisun Bay, regardless of their ethnic affiliation they may be included for demographic purposes among the delta tribes. Some further light can be thrown upon the problem by an analysis of the dates shown for baptisms in the San Francisco Mission records. If the baptisms of gentiles are tabulated according to village and year, it is seen immediately that the conversions in the first year, 1777, were all from local rancherias. This group was extended during the following decade until the San Francisco peninsula had been completely covered. However, after the year 1792 all mention of the peninsula abruptly and entirely ceases. As early as 1778 on the other hand baptisms are listed from a village (Halchis) specified as being in the "sierra oriente de la otra banda." In the succeeding years villages ascribed to the "otra banda" become more frequent and reach a peak between 1790 and 1795. Subsequent to 1800 the conversions from these places diminish rapidly and disappear. Now we know by following the documentary accounts of expeditions that during the decade 1790 to 1800 the great effort of the San Francisco Mission was expended in securing neophytes from the east shore of San Francisco Bay as far north as the Carquinez Strait. There are no baptisms of gentiles whatever listed in the San Francisco books for the years 1797, 1798, and 1799. Therefore it is reasonable to assume that the supply of Costanoans from the east bay had been exhausted. Furthermore, village names qualified by the term "otra banda" and appearing in the baptism record _for the first time_ prior to 1800 must certainly refer to villages in this region. Among these are rancherias stated as belonging to the "nacion Juchium" together with the separate designation "Tuchimes." Thus it is clear that the Huchium lived, as Merriam believed, on the east shore of the bay. After the inactive period at the end of the century a flood of neophytes began to pour into the mission together with a completely new set of names. One of the first of these is Habastos, a rancheria which contributed 137 converts in 1800 and 1801 and which is now stated, for the first time in the mission book, to lie "acia el estero de los rios." Later, the variants Quivastos and Aguastos are used. Conversions from this tribe continued until 1810, after which the name disappears from the lists.