62 BULLETIN NO. 4, DIVISION OF ENTOMOLOGY. 
ver and between Denver and Fort Collins. At this latter place there is, 
as at Golden, a series of low mountains lying in front of the main range 
and separating the open country from aseries of fertile valleys and park- 
like areas that lie back among the foot-hills and low mountains. These 
valleys and park-like openings among the foot-hills and low mountains 
are richly clothed with nutritious grasses, and are mostly well watered, 
thereby affording good footing for the breeding of locusts during years of 
their presence in this section of the country, and being every year the 
home of scores of species of ‘“‘ natives.” It is in such localities as these 
that the greatest variety of locusts of all sorts is to be found in Colorado. 
What is known as the Livermore country, on the North Fork of the 
Cache la Poudre, is a widening out of the valleys and park-like tracts 
into quite a large area of good farming land and a better grazing re- 
gion. This Livermore country continues to stretch out to the west and 
northwest until it is lost among the park-like openings on the suminit 
of the Laramie Range, south of Sherman ; and from here is joined to the 
Laramie Plains on the west slope by valleys sloping that way. The 
Laramie Plains require no description here, while the numerous small 
parks lying to the south of the Laramie River, and between it and 
North Park, can be described as being merely openings in the timber, 
varying from 7,500 to 8,500 feet above the sea, and they at times form 
splendid retreats to the locusts and excellent grazing areas at all times 
to cattle and the large herds of game that frequent these parts of 
Colorado. During the sammer and fall of 1880,a greater portion of 
this country, lying between the Laramie River and the North Park, was 
overrun by fires, during the progress of which, without any doubt, great 
numbers of both migratory and native locusts must have perished from 
heat and smoke. North Park is a vast grassy tract surrounded on all 
sides by high ranges of mountains, and shows plainly by its leading 
features thatit was at one time the bed of avast lake. Its lower end 
is about 7,600 feet in altitude, while all the other portions are higher. 
It is well watered and grassed, thus rendering it one of the most relia- 
ble grazing regions in northern Colorado. While its altitude is too 
great for safe adventure in general farming, it willnevertheless produce 
excellent crops of vegetables and small grain. Its entire surface could 
be burned over with some result in locust years. 
