o .eg an Jo of En1tomol0lD' - Norsk entomologisk forening

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Fig. 14. Activity density for Atheta fungi in each of
the 12 fields.
when it probably reproduces. From Fig. 13 it is, however,
not possible to conclude whether it has I or 2
generations a year, or even 3, as reported by Fuldner
(I 960).
Atheta fungi (Gravenhorst), making up 5.3% of
the material, was numerous both at Jel0Y (5.9), As
(5.4) and Ski (4.0). It is common in European fields
(Geiler 1959/60, Pietraszko & Clercq 1978, Topp &
Trittelvitz 1980). Maximum activity density occurred
in July-Aug. (Fig. 14), and during June-Sept. about
IS callow specimens were caught. Possibly it emerges
from pupae in June-Sept. and reproduces the
same summer. According to Topp (I 975) it overwin­
'ters as adults.
Phi/onthus ochropus (Gravenhorst) made up 5.2 %
of the material. It was most numerous at As (8.7),
more scarcely caught at Jel0Y (0.7) and Ski (0.4),
which shows that it probablYoPrefers clay soil. Geiler
(I 959/60)found it in fields, otherwise little is known
about it appear