1895.] MYODES LEMMUS. 37 
of barns. Most of them die there during: the course of the win- 
ter, or, as it is presumed, shortly after the melting of the snow, 
*as they eat themselves to death on the sprouting grass” (fgroen” 
= the sprouts). This supposition which is wide spread amongst 
the people in almost all the raided districts, was, as previously 
mentioned, put forward by Jacob Ziegler so early as 1532 (see 
p. 6), but it has not been possible as yet, to confirm the cor- 
rectness of the statement. 
During the great migratory years the exodus is continued 
far over the lowlands proper. During this they have got so 
far as the distriets around the Christiania Fjord, the coast line of 
Christiansand Stift down to Lindesnæs itself, and the low flats 
of Jæderen. 
On the whole it may be assumed, that scarcely amy accessible 
point of Norway (except the outermost islets) has mot been in- 
vaded by their hordes during ome or other prolific year. 
Whilst in Sweden they are not known to have been met 
with south of Wermelapd (61" N. Lat.), with us, in prolific 
years, they penetrate down to Lindesnæs, situated in latitude 
580 North. 
11. The Frequency and Duration of the Migrations: 
Ås previously stated, no rule can be laid down concerning 
the frequence of prolifie and migratory years. The greatest mi- 
ørations, which extend down to the most distant lowlands, take 
place but seldom on the whole, and barely occur in the southern 
districts of the country oftener than once in ten years, occasion- 
ally at still greater intervals!. 
1 Of late years individuals have only twice, during the migratory 
years 1862—63, and 1875—76, reached the neighbourhood of Christi- 
