. Bulletin - United States National Museum. Science. M \M (ir 'HE MEXICAN BOUNDARY. 387 season on the western part of the Colorado Desert. The same is true of the other mammals living in those regions. I/,iJ)!ts ,111(1 local distribution. In L885, when marching with the Third Cavalry toward Texas from Fori Verde, Arizona. I first met with the Yuma ground-squirrel then only known from the specimens collected by Maj. (afterwards Maj. Gen.) George II. Thomas, Dear Halls Station on New River, just within the northern limit of Mari- copa County, Arizona. I saw. them every day of our march unt
. Bulletin - United States National Museum. Science. M \M (ir 'HE MEXICAN BOUNDARY. 387 season on the western part of the Colorado Desert. The same is true of the other mammals living in those regions. I/,iJ)!ts ,111(1 local distribution. In L885, when marching with the Third Cavalry toward Texas from Fori Verde, Arizona. I first met with the Yuma ground-squirrel then only known from the specimens collected by Maj. (afterwards Maj. Gen.) George II. Thomas, Dear Halls Station on New River, just within the northern limit of Mari- copa County, Arizona. I saw. them every day of our march until we arrived at Mountain Springs, a day's march east of Tucson. From this point eastward to Deming, New Mexico, I mistook Oitellus spilo- soma macrospilotus for this species, and embrace this occasion to rectify my previous erroneous record of the existence of the Yuma ground-squirrel in southeastern Arizona and at Deming, New Mexico. On October IT, L884, I saw some Yuma ground- squirrels among the mesquites on the San Carlos flats at the Indian Agency on the Gila River. Near the Mexican Boundary this species is abundant from the Santa Cruz Valley. Arizona. to the Coast Range Mountains of California. From January 25 to February 8, 1S*.>T, it only appeared on the warmest days in places on both sides of the Boundary where it is common. Our first specimens were caught at Quitoba- quita; they were not out of their burrows in the region to the eastward, during the cold season of our visit. It appeared to be scarce in Feb- ruary on the plains immediately surrounding the Gila Mountains, but was common at Adonde Siding on the Gila River, and less so at Gila city, on the Gila, 15 miles above Yuma, Arizona. It was abundant along the Gila from Gila city to Yuma, and down the Colorado River to the Gulf of Cali- fornia. It was common, though generally not abundant, along the Salton and New rivers to the Boundary Line and thence west as far as Coyote Wells. It was most abundant at Indian
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