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 



