THE. ROCKY MOUNTAIN LOCUST IN_ 1882. 13 
were present on all sides; great crevices were filled with dark basaltic 
eolumns, and walls of the same were at many points objects of much 
interest and comment to the passengers. 
This evening, at the mouth of Judith River, while taking on wood, IL 
noticed a great many yellowish-green larve feeding on almost every 
variety of vegetation to be found at the locality. The willows (Salix 
longifolia), however, seemed to be its favorite food, as they were com- 
pletely defoliated. I do not know what species the insect was, but have 
sent some on to Washington.® At this same locality I noticed two 
specimens of Caloptenus very closely allied to spretus, if not this insect, 
but could not get them, as they jumped away and were lost among the 
rose-bushes. 
July 19.—To-day landed about three miles below Fort Benton, and 
walked up to town over the bluffs on the north side of the river. Saw 
a great many insects of different kinds, and collected some. Locusts 
much more numerous here than below. No migratory specimens among 
the other forms, but a few that appear to me to be new to science. 
During our stay at Fort Benton much of our time was occupied in 
collecting the various locusts to be found in the vicinity, and also in 
looking for Yucca moths, &c. No data in reference to locusts additional 
to those already possessed from this locality. On our trip to McLeod 
we occasionally saw specimens of a large, dark-winged Cidipoda-like 
locust® as well as a few others which we could not stop to capture; but 
very few of the migratory kind among these. Country between Ben- 
ton and McLeod is all high, dry, and alkaline, and is for the most part 
an excellent breeding ground for all kinds of locusts. The water in a 
great many of the isolated springs contains a large per cent. of sulphate 
of magnesia, and hence is very trying on the traveler, since it is the 
only water to be obtained. The grasses over this stretch of country 
improve in quality and length as we move northward, and also as we 
approach the mountains. 
The general surface is comparatively smooth and slopes gently away 
to the east, only becoming broken and somewhat barren in the vicinity 
of the rivers and deep coulées, where the features of the bad-lands of 
Dakota and Eastern Montana are again repeated, though in a less de- 
gree. This entire section at a period not long past was literally over- 
run by buftalo, and hence can be relied on as a splendid stock range. 
Where buffalo range, the winters, though at times cold and severe, are 
comparatively free from snow, and hence are suited to winter grazing. 
August 3.—Here, in the vicinity of Fort McLeod, there is a great 
variety of native locusts, and on the flat, stony grounds to the south- 
west they are quite numerous. They are mostly Gidipodine, with a few 
forms of Acridine. While on our journey to the mountains west of 
Fort McLeod we succeeded in capturing a great many of them that 
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*Zerene catenaria (Cramer). 
‘Circotettix carlingiana Thos. 
