The sharp segregation of dates of conversion are clear evidence that, whatever the racial or linguistic affiliation, there were two groups of Indians, one converted before 1801 and living along the shore of the bay generally south and west of the Carquinez Strait, the other converted between 1801 and 1810 and living at the east end of the strait and along Suisun Bay. There probably was no clear separation of the two in the minds of the Spaniards; hence the confusion of names. We are concerned here with the second group, the one uniformly designated Aguastos, which inhabited the approaches to the delta. With respect to the aboriginal population of this group we have no direct evidence whatever. On the other hand the record of the San Francisco Mission shows 396 baptisms. This immediately sets a lower limit to the number of Aguastos for there certainly can have been no fewer members of the tribe than were baptized. Regarding the upper limit it can be pointed out only that the group was completely obliterated at the time of conversion and its name never appears again in either contemporary or modern records. Hence it is safe to assume that substantially all the Aguastos were taken to San Francisco and that the baptisms include the entire tribe. We may thus ascribe to them a population of approximately 400 persons. We now encounter the Chupunes (or Chupcanes), concerning whom Schenck (1926, p. 143) has this to say: The Chupunes (Chupcanes), apparently a group, were located along the southern shore near the east end of Carquinez strait. West of the strait, also on the southern shore--in the Pinole region of San Pablo bay--were the Huchones. The earliest documentary reference is to the diary of Abella, in 1811. On October 16 he went through Carquinez Strait by boat. Then he says that the strait "... remata en la tierra de los Chupunes, porque hay ya ensancha ..." The "ensancha" or widening begins at Port Costa and continues to Martinez. This, then, is the boundary of the Chupunes. On October 28, discussing the Suisunes on the north side of the bay, he says that "La rancheria citada de los Suisunes cahe al nordeste de los Chupanes, tierra adentro del Cerro de los Karquines ..." The Cerro de los Karquines is, of course, Mt. Diablo. In his account of the expedition of 1817 Duran tells how he arrived at noon of May 14, by boat from San Francisco, at the "remate" of the "estrecho de los Chucanes," at a point 14 leagues northeast of San Francisco and 17 leagues north-northeast of San Jose. The rancheria of this name, he states, is now Christian, at San Francisco and San Jose. The mission books show a total of 105 baptisms at the two establishments.