138 Mr. C. H. T. Townaend on Diptera XIII. — Contributions from the New Mexico Biological Station. — No. IV. Diptera from the Sacramento and White Moun-tains, in Southern New Mexico. I. Bj C. H. Tyler TOWNSEND. The Sacramento Mountain and White Mountains are situated in south-central New Mexico, in north-eastern Dona Ana, and western Lincoln counties. The Mescalero Apache Indian Reservation is located within the limits of the northern portion of the range. White Mountain stands at the north-western end of the Sacramentos, and really forms a part of the range. It is the highest point, being in the neighbourhood of II ,000 feet. Military maps give its elevation as 11,092 feet. The Rio Rui-doso heads on its eastern slopes, as do also Eagle Creek and the two forks of the Rio Bonito. The most of the Ruidoso collecting was done some miles below its head, from just above Dowling's Mill to a point 4 miles west, the altitude being about 6500 to 6600 feet. Dowling's Mill is given by military maps as 6455 feet. Austen's Ranch, on the north fork of the Rio Bonito, is about 6400 feet; it is situated some 12 miles up this fork west from Fort Stanton (now recently abandoned as a military post), which latter is on the Rio Bonito just below the junction of the two forks, at an altitude of 6151 feet. The Mescalero Agency, or post-office of Mescalero, being the only settlement on the reservation and the headquarters of the Indian Agent, is situated in the head of the main valley of the Rio Tularosa, on the Ruidoso road, some 7 miles below or south of the top of the divide. It is halfway between Tularosa town and the Upper Ruidoso store, it being 18 miles from the Agency to either place. The altitude of the divide just mentioned is about 7000 feet. White Moun-tain, it is understood, with tlie Rio Ruidoso and Rio Bonito, lies on the other side of tliis divide, to the north and north-west of it. The altitude of the Agency is 6340 feet; that of Tularosa town, situated on the plain at the western base of the mountains and near the mouth of the Rio Tularosa valley, is 4140 ftct. These and several other elevations, including White Mountain and Dowling's ^lill, witli other valuable data, were kindly furnished me by Lieutenant V. E. JStottler, U.S.A., who has charge of the ]\lescalero reserva-tion, and to whom 1 wish here to express my thanks for many courtesies. The road from Tularosa to the Agency follows up the
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