Practically all of the Negrito rancherias are within the jurisdiction of the two towns of Botolan and San Marcelino. Following the winding course of the Bucao River, 15 miles southeast from Botolan, one comes to the barrio of San Fernando de Riviera, as it is on the maps, or Pombato, as the natives call it. This is a small Filipino village, the farthest out, a half-way place between the people of the plains and those of the uplands. Here a ravine is crossed, a hill climbed, and the traveler stands on a plateau not more than half a mile wide but winding for miles toward the big peak Pinatubo and almost imperceptibly increasing in elevation. Low, barren ridges flank it on either side, at the base of each of which flows a good-sized stream. Seven miles of beaten winding path through the cogon grass bring the traveler to the first Negrito rancheria, Tagiltil, one year old, lying sun baked on a southern slope of the plateau. Here the plateau widens out, is crossed and cut up by streams and hills, and the forests gradually become thicker. In the wide reach of territory of which this narrow plateau is the western apex, including Mount Pinatubo and reaching to the Tarlac and Pampanga boundaries, there are situated no less than thirty rancherias of Negritos, having an average population of 40 persons or a total of more than 1,200. Besides these there are probably many scattered families, especially in the higher and less easily accessible forests of Mount Pinatubo, who live in no fixed spot but lead a wandering existence. And so uncertain are the habits of the more settled Negritos that one of the thirty rancherias known to-day may to-morrow be nothing more than a name, and some miles away a new rancheria may spring up. The tendency to remain in one place seems, however, to be growing. The mountainous portions of the jurisdictions of the two towns of Botolan and San Marcelino, themselves many miles apart with three or more towns between, are contiguous, the one extending southeast, the other northeast, until they meet. The San Marcelino region contains about the same number of Negritos, grouped in many small communities around five large centers--Santa Fe, Aglao, Cabayan, Panibutan, and Timao--each of which numbers some 300 Negritos. They are of the same type and culture plane as those nearer Pinatubo, and their habitat is practically the same, a continuation of the more or less rugged Cordillera. They are in constant communication with the Negritos north of them and with those across the Pampanga line east of them. The Negritos of Aglao are also in communication with those of Subig, where there is a single rancheria numbering 45 souls. Still farther south in the jurisdiction of Olongapo are two rancherias, numbering about 100 people, who partake more of the characteristics of the Negritos of Bataan just across the provincial line than they do of those of the north.