162 ENTOMOLOGISK TIDSKRIFT 1914. 
(on July oth). EKMAN tells us, he has never found this spe- 
cies in water warmer than + 14° C. It seems therefore in 
the region of Helagsfjäll to be exposed to less arctic condi- 
tions than farther north. But for all that this animal, as also 
Polyartemia forcipata, must be looked upon as a real arctic 
species. Besides in the above named pond, I saw the crea- 
ture also close to the south of the mountain in two other, 
though not so extremely heated waters. All of them are 
drying up later in the year. x 
Polyartemia forcipata and Pranchinecta paludosa are 
widely distributed in north-southerly direction through the arc- 
tic alpregion of Sweden. The former is previously found at 
Karesuando (northernmost part of Sweden) by C. P. LAESTA- 
DIUS, as also by S. EKMAN in the vicinity of the Torne träsk, 
in the Sarek-alps (both localities in Lapland) and at Frost- 
viken (Jämtland). Later on at Helagsfjäll by the author. 
Branchinecta paludosa, that here in Sweden first was captured 
by S. EKMAN, is by him noticed from the region of Torne 
träsk and the Sarek-alps, and last summer the author caught 
it at Helagsfjall. In Norway it is observed farther south 
in the high Dovre-alps, and in the northernmost part, too, 
on Magerö and in East Finmark. ZFolvartemia, on the other 
hand, is in Norway found only in the far north, viz. in the 
whole Finmark at many localities. 
It is very possible that the new Swedish above named 
localities for Polyartemia and Pranchinecta are the most sou- 
thernly ones, in which the two species occur in our country. 
But at the present state of our knowledge it is too early to 
decide, whether the area of distribution is fully continuous 
or not. Between the two southern Swedish localities for 
Polyartemia (see map I) there is a lower portion of our 
country (the province of Jämtland), a vide alp-pass with only 
certain mountain tops reaching up. into the birch and the arc- 
tic zone. Dranchinecta in the Dovre mountains in Norway 
is by SARS regarded as being a glacial relic from the ice 
age. Perhaps a more careful investigation may show that also 
the locality at Helagsfjäll is isolated from the northern area 
of distribution. 
