Full-text - Norsk entomologisk forening

238 A. Lillehammer
high altitude lakes and streams both with
stony stable substrata and with sand and
unstable substrata. The species occurs in all
parts of Sweden (Brinck 1949).
Nemoura flexuosa (Fig. 44) has been taken
both in southern and northern Norway, but
seems to be more common in the north. The
species is absent from western Norway, the
coastal areas of eastern Norway, and Setesdal
in the south. In southern Norway the
species has only been taken within the coniferous
forest areas. It seems to be most common
in small forest streams in the areas west
of Oslo and around Tynset, Hedmark. In
northern Norway it is most common in the
Sub-Alpine belt of the fjord areas of Finnmark.
In Sweden the species is rare towards
north (Brinck 1949).
N emoura sahlbergi (Fig. 45) has only been
taken in the counties of Finnmark, Troms
and in Nordland at Narvik, although it has
been taken further south in Sweden. The
species is common in the fjord areas of Finnmark
and has been taken mainly in the Sub­
Alpine belt. In Pasvik the species occurs in
the Sub-Arctic and Boreo-montane Sub-zone.
N emoura sahlbergi seems to be most common
in small streams. In Sweden the species has
been taken as far south as Messaure (Muller
& Thomas 1972).
N emoura viki (Fig. 46) has only been found
in Finnmark where it may be numerous in
slow-flowing small streams; it has also been
collected in lakes and outlets. The species has
been taken in the Sub-Arctic and Boreo-montane
Sub-zone, and in the Sub-Alpine and
Low-Alpine belts where Salix occurs along
the watercourse.
N emurella picteti (Fig. 47), although present
in both southern and northern Norway, has
not been found in the coastal areas of North
Rogaland and Vestfold. The species occurs
in small and large streams, rivers and lakes,
both in the lowlands and in the mountains.
N emurella picteti is among the highest altitude
species in the mountains, and it may be
the sole herbivorous species in lakes of the
Low-Alpine belt. It is also sometimes collected
together with CaJmia atra in such
habitats. The highest locality is at about 1400
m a.s.l. in 0vre Heimdalen. The species
occurs on both stable stone substrata and in
substrata composed of sand and mud. The
species is taken in all parts of Sweden
(Brinck 1949).
Protonemura intricata (Fig. 48). I have only
taken it twice in Norway in small streams
in the Sub-Alpine zone of the northern part
of Finnmark. The species is not recorded from
Sweden but has been collected in both the
northern and southern parts of eastern Finnoscandia
(Meinander 1965).
Protonemura meyeri (Fig. 49) occurs in both
southern and northern Norway, but is rare
in the fjord areas of northern Norway. In
the coastal areas in the west and south it is
common and often numerous.
In south Norway Protonemura meyeri has
been taken in the Low-Alpine vegetation belt
up to altitudes of 1300 m a.s.1. It occurs in
small and large streams and in rivers, but is
most numerous in small streams. The species
is found in all parts of Sweden (Brinck 1949).
Fam. CaJmiidae
In this family there are five Norwegian species,
all herbivores.
CaJmia atra (Fig. 50) was taken in both
the north and the south, but not in the southern
parts of western Norway. In Hardanger
and Sogn the species was taken in the inner
fjord areas. Further northwest the species
may be more common than indicated in Fig.
50. In eastern Norway the species has not
been collected south of Oslo and H j artdal in
Telemark. In southern Norway the species
is most common in the mountains, where it is
numerous in streams and lakes. The highest
record is from a stream at about 1500 m a.s.l.
in 0vre Heimdal, located in the Middle­
Alpine vegetation belt. In the central lowlands
of eastern Norway the species occurs
on stony substratum in small and large
streams, rivers and large lakes such as Mjesa.
However, the main distributional area in
southern Norway is Sub- and Low-Alpine
belts of the central mountain areas. In northern
Norway, CaJmia atra is common in lakes,
outlets, small streams and large rivers.
Both in North-Norway and in the central
mountain areas of South-Norway the species