lb'4 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
ascens most abundantly on the Alps or grassy slopes of Gray's Peak, 
between the timber line and the bare rocky summit, i. e. , between 11,000 
and 1.3,000 feet, the mountain being 14,341 feet elevation. 
In Utah, Eastern Idaho, and Montana Anabrus simplex (Fig.2)abouuds 
atelevations of much less height, and its breeding grounds adjoin those of 
the locust. For ex- 
ample, the black 
cricket of the Great 
Salt Lake region 
breeds and lives on 
b Z^Jt. ^^^L, the bench -la nds 
FIG. 2.— Anabrus simplex nat. size; a. female; b, end of body of male. S U 1" I' (> 11 11 d i U g the 
showing the claspers. ] a k e . uu t even here 
they do not usually lay their eggs in the more fertile, moist, cultivated 
lands infested by the Kocky .Mountain locust. From the bench-lands 
of the Great Salt Lake the cricket ranges up as far at least as about 
S,000 feet in the Wasatch Mountains, breeding in great quantities about 
the mining towns, and in the passes among the mountains. 
Although, therefore, ordinarily the crickets lay their eggs and the 
young develop in the dry bench-lands and sides of the foot-hills, they 
emigrate from this region, press down sometimes in great numbers and 
invade the wheat-fields, corn-fields, and pasture lands in the lower, 
moister tracts. I have often been informed thai this was the habit of 
the cricket in the vicinity of Salt Lake City. This is corroborated by 
the observations of Mr. Thomas, published in Hayden's Report on the 
Geology of Montana for 1871. Referring to Anabrus simplex, the com- 
mon brown cricket of Northern Utah and Eastern Idaho, he writes as 
follows : 
At some points we found them so abundant as literally to cover the ground. In two 
or three instances they all appeared to be moving in one direction, as if impelled by 
some common motive. I recollect one instance, on Portneuf River, where an array 
was crossing the road. It was probably as much as 200 yards in width. I could form 
no idea as to its length. I only know that as far as I could distinguish objects of this 
size (being on horseback) I could see them marching on. I think that in all the cases 
where I saw them thus moving, it was towards a stream of water. They appear to be 
very fond of gathering along the banks and in the vicinity of streams. In the north 
part of Cache Valley I frequently noticed the ditches and little streams covered with 
these insects, which, having fallen in, were floating down on the surface of the water, 
and, though watching them for hours, they would flow on in an undiminished stream. 
While encamped on a little creek near Franklin, in this valley, it was with difficulty 
we could keep them out of our bedding ; and when one went to breakfast, we found 
the underside and legs of the table and stools covered with them, all the vigilance of 
the cook being required to keep them out of the victuals. 
Thefollowing account of the movements of an army of the large brown 
cricket (Anabrus simplex) is extracted from Mr. Thomas's notes of his 
journey in 1871 : 
June 18, Sunday, between Carpenter's Station and the toll-gate at Poftneuf Cross- 
ing, I saw a large army of this species moving in regular order ; they were crossing 
