220 ANIMAL LIFE IN THE ROCKY MOUNTAINS OF COLORADO. 
red mites attached to the posterior extremity, not very unlike those 
often seen about the roots of the wings of grasshoppers, except 
that these were smaller. These also interfere greatly with the re- 
production of the species. I am not aware of any other instance 
where a perfect Coleopterous insect is so infested with Tachina 
parasites. A much larger species has been bred from maggots 
found in the larva of the Colorado potato bug. 
Par Rane 
ANIMAL LIFE IN THE ROCKY MOUNTAINS OF 
COLORADO. 
‘BY PROF. W. H. BREWER. 
— Oe 
In the summer of 1869, I accompanied the Harvard Mining 
School Expedition to the Rocky Mountains, under Professor J. D. 
Whitney, and during the trip, I made some notes that may be 
worth putting on record, although very imperfect from my igno- 
rance of the specific characters of the animals. 
' Our explorations were principally in the region about South Park, 
Colorado, and along the crest extending to beyond the head waters 
of the Arkansas, and north to Gray’s Peak. The altitude of those 
parts of South Park where we spent most time is from 9,600 to 
9,900 feet. I was on the following peaks in fine weather, and on 
some of them more than once. 
Gray’s Peak, 14,145 feet; Irwin’s Peak, about the same height; 
‘Mt. Lincoln, 14,123 feet; Horse Shoe, 13,806 feet; Silverheels, 
13,650 feet; Mount Yale, 14,078, besides numerous points over 
11,000 feet. . (Mt. Harvard, the highest point of the Rocky 
Mountains, 14,270 feet, was ascended by other members of the 
party on a very unfavorable day.) 
On these peaks, the limit of tree vegetation, as had been al- 
ready shown by Dr. Parry, is a little over 11,000 feet, and on all 
the peaks named, there were considerable masses of snow at the 
time of our visit, which was from the middle of July to the first of 
September. , : 
_ In South Park, deer are abundant. Elk were occasionally seen 
(we saw but three). Mountain sheep are found on the ridges 
