1895.] MYODES LEMMUS. 41 
least as far as Surendal in the West, as well as the adjoining 
distriets of Sweden right down to the Baltic. 
In these latter regions the wanderings were as å rule in å 
tolerably regular course from west to east. The highest moun- 
tains, thus the real radiating-centre, were situated in this in- 
stanee to the West, and most of the valleys of the adjoining 
portions of Sweden mainly run in an easterly or south-easterly 
direction. 
During the migration of 1875—76, an increase commenced 
80 early as the autumn of the first year in the mountains of 
Thelemarken, and the southern portions of the Lang-Fjeldene, 
where the swarms inundated the adjacent valleys in Christian- 
sand Stift, and the south-eastern portions of Christiania Stift. 
During this, stray individuals reached the Christiania Fjord 
itself, Skien, and the coastal districts in the Christiansand 
Stift. 
The distance from Christiania to the nearest mountains in- 
habited by this species, is about 90 kilométres. 
In 1876, the increase continued on the northern portions of 
the Lang-Fjeldene, on the Romsdal mountains and the Dovre- 
fjeld; and the valleys on both sides of the Dovre mountains 
were then occupied, on the North as far as the Trondhjem's 
Fjord, and to the South as far as the districts bordering the 
lake Mjösen, Kongsvinger, and Christiania. 
During the entire summer of 1876, they continued to re- 
main in the southern lowlands, even if not very numerous, and 
bred there in many localities. The last young ones I met near 
Christiania on the 6th August, and the last adult individuals in 
the middle of October. 
In the summer of 1877, they had entirely disappeared from 
the lowlands, and even the mountains appeared quite deserted. 
