SOUTHEEN RANGE OF THE LOCUST IN NEW MEXICO. 159 
1879. — We were told at San Juan that there were a few locuscs on the 
grain-fields at this point, but on examination found only a few of the na- 
tive grasshoppers, such as species of (Edipoda. We believe that none 
existed in New Mexico in 1879, unless scattered individuals among the 
mountains near the Colorado line. The summer of 1879 was exception- 
ally dry — the "driest since 1852." As already stated, it was also excep 
tionally dry in Colorado and Utah. 
SOUTHERN RANGE OF THE LOCUST IN NEW MEXICO. 
The Rocky Mountain locust (Caloptenus spretus) in the year 1868 
seemed to have extended farther south than any year before or since, so 
far as we could ascertain. As ex-Governor Arny informed us, the farth- 
est point south to which they flew was one hundred and forty miles 
south of Santa Fe ; this would carry the southern limits of the region 
periodically visited by this species of locust as far south as Fort Craig 
on the Rio Grande River in Socorro County. So that we may infer that 
occasionally, though rarely, the northern two-thirds of New Mexico, i. e., 
the portion lying north of the 34th parallel, are liable to invasion from 
locusts breeding in the Arkansas and San Juan valleys of Southern Col- 
orado. In accordance with these facts, we have altered the map and 
extended the Temporary Region so as to cover the northern two-thirds 
of the Territory of New Mexico. 
Ex-Governor Arny, who was agent of the Navajo Indians and lived on 
this reservation in the northwestern corner of the Territory, thinks that 
the locusts breed in that region of Arizona lying northwest of Valencia 
County, New Mexico, and that it is not improbable that the locusts breed 
in Eastern Arizona, i. e., that part next to Socorro County, New Mexico, 
and extending northward to the Navajo Agency. As stated in our First 
Report, Mr. Thomas has seen a few specimens from Arizona collected by 
Lieutenant Wheeler's expeditions during the four years previous to 
1877. We venture to predict that this species will yet be found in the 
Mogollon Mountains of Eastern Arizona. 
CHANGES IN THE MAP SHOWING THE DISTRIBUTION, MIGRATIONS, 
AND BREEDING GROUNDS OF THE ROCKY MOUNTAIN LOCUST. 
The following changes in the large folding map showing the distribu- 
tion, migrations, permanent and subpermauent breeding grounds, &c, 
of the Rocky Mountain locust in the First Report, have been rendered 
necessary by the investigations made during the summers of 1878 and 
1879, and the historical data collected in New Mexico during the last 
summer. 
In the map as originally published, the Uintah Mountain region in 
Utah, and the valley of the White River in Western Colorado, and the 
San Luis Valley and adjacent mountainous region in Colorado, and the 
Wind River region and Yellowstone Park in Wyoming, as well as the 
