NORSK ENTOMOLOGISK TIDSSKRIFT - Norsk entomologisk forening

New Records of Capnia bifrons (Newman) 95
Fig. 3. Skytterbanebekken.
Common to both the two C. bifrons streams is that they come
from a wooded area in the mountains, and run through cultivaterl
fields. Leafy trees fringe the course of the streams and a considel -
able quantity of foliage and plant remnants is found among the
debris on the stream bed; further, the water is neutral or slightly
acidic, and a moderate amount of CaO dissolved in the water.
It does not seem, however, as if the amount of CaO in the water
restricts the extension of C. bifrons in the manner Brinck (1949)
mentions, as Sseterbekken (Lillehammer 1965) was poor in lime
with only 7.9 mg CaO/l. I think the amount of plant remnants
in the stream is quite important.
C. bifrons could certainly be found in other places in East
Norway in that it has been found in two places as wide apart as
Bserum and Tynset. It is an open question, however, whether
it would appear north of Dovre or in West Norway.
Summary
Considerable numbers of Capnia bifrons were found at Tynset,
farthest north in the county of Hedmark, East Norway, about
490 m above sea level. This is the northernmost known record
of this species in Scandinavia. The emergence of Capnia bifrons
was observed from 1114 to 1914 1965 and the nymphs climbed up
on the bank and moved about until the nymph skin was shed.