Full-text - Norsk entomologisk forening

174 A. Bakke
baffles and a HPL 125 W mercury-vapour
bulb. The traps were sited with the bulb at a
level of 1 m above the ground.
The catches took place at both sites every
night in the following periods: 1969, from
15 April to 30 September; 1970, from 15
April to 30 October; and 1971, from 10 April
to 8 November.
The moths were anaesthetized and killed
by acetylentetrachloride when they entered
the trap.
Fig. 1. Map of South Norway indicating the
geographical position of the sites, Grimstad and
AmE.
sites are surrounded by agricultural fields
and forests.
Around the Grimstad site, oak trees, Querqus
robur, constitute an important part of
the forest, but Scots pine, Pinus sylvestris
and Norway spruce, Picea abies, are present
in the neighbourhood together with most of
the deciduous trees growing in southern Norway.
Around the horticultural school is a
park area with numerous foreign trees,
bushes, and other plants of various kinds. The
landscape is rather flat, broken by bedrocks.
The trap was sited on a hillock with tall oak
trees close by.
At Amli there are only a few oak trees.
Spruce and especially pine dominate, but
birches, Betula pubescens, willows, Salix sp.,
and poplars, Populus tremula, are scattered
mostly at the edges of the coniferous forests.
The site was at the bottom of a valley, 400 m
from a river, and surrounded by mountains
up to an elevation of 400-500 m. The trap was
sited at a south-west facing edge of the forest.
The light-trap
The light-traps were built after the model of
Robinson (Robinson & Robinson 1950) with
The catches
The material from each night was collected
in paper bags. The following identifications
were made: all specimens of the families
Notodontidae, Saturniidae. Endromididae,
Lasiocampidae, Lymantriidae. Drepanidae,
Polyplocidae, grouped under the name Bombyces,
and Noctuidae, Hylophilidae, Plusiidae
grouped under the name N octuoidea.
The nomenclature follows Opheim (1958,
1962). A total number of 29,128 specimens
comprising 230 species is included in the
material, 15,405 specimens from Grimstad
and 13,626 from Amli.
RESULTS
The total number of moths of each species
collected every year at the two sites is presented
in Table I. Thirty-eight species of
Bombyces were recorded. The number of
species was 32 on both sites, but only 26
were found on both sites. Twelve species were
recorded only on one of the sites, six on
each. Two were recorded for the first time in
Norway; Selenephera lunigera Esp., 5 specimens,
Amli 1970 (Bakke 1971), and Drymonia
trimacula Esp., 9 specimens, Grimstad 1971.
Parmelina ridens F., recorded for the first
time in Norway in 1969 (Bakke 1970) at a
locality close to Grimstad, was found at
Grimstad 1970 (7 specimens) and 1971 (2
specimens).
A total species number of 192 N octuoidea
was recorded, 175 species at Grimstad and
157 at Amli. Sixteen species were found at
Amli, but not at Grimstad, and 34 at Grimstad,
but not at Amli. Erastria trabealis Se.
was new to the Norwegian fauna (Bakke
1970), and 20 species were recorded in Aust­
Agder for the first time.