Náttúrufræðingurinn - 1977, Page 34

■lldar, en það var ekki fyrr en fiðrild-
in liöfðu klakist, að í Ijós kom, um
hvaða tegundir var að ræða.
Það er erfiðleikum háð að rækta
fiðrildalirfur með góðum árangri. Sjá
þarf til þess, að þær fái fæðu við sitt
hæfi, ef þær eru ekki fullvaxnar. Þá
þarf einnig að hafa hentugt rakastig
og hæfilegan hita í ílátinu, sem lirf-
urnar eru hafðar í. Mjög hætt er við,
að mygla og sýklar valdi truflunum
eða eyðileggingu. Það er því ráðlegt
að hafa aðeins eina eða fáar lirfur í
hverju íláti.
HEIMILDIR
lijörnsson, Hálfdán, 1951: Gróður og
dýralíf í Esjufjöllum. — Náttúrufr.
21: 112.
Frislrup, B., 1943: Contributions to the
Fauna and Zoogeography of North-
west Iceland. — Ent. Medd. 23: 154.
Lindroth, C. II., Andersson, /-/., Böðvars-
son, H. ir Richter, S. H., 1973: Surts-
ey, Iceland. The Development of a
New Fauna, 1963—1970. Terrestrial
Invertebrates. — Fnt. Scand., Suppl.
5: 92-93.
Nordström, /■'., Kaaber, S., Opheim, M. &
Sotavalta, O., 1969: De Fennoskan-
diska och Danska Nattllynas Utlired-
ning (Noctiudae). Kort nr. 31, 259 og
372.
Wolff, N. L., 1971: Lepidoptera. — The
Zool. of Icel. III, Part 45: 85-86,
102-103, 110-111.
S U M M A R Y
Three migratory moths breed successfully in Iceland
by Erling Ólafsson,
Zoological Institute, Helgonavdgen 3, 223 62 Lund, Sweden,
and Hálfdan Björnsson,
Kvisker, Óraefi,
The noctuid moths Autographa gamma
L., Agrotis ipsilon Huln. and Phlogo-
phora meticulosa L. (Lepidoptera, Noc-
tuidae) have for long been well known
visitors in Iceland. The first two species
are fairly common vagrants, that some-
times invade in considerable numbers.
The third species is often observed, but
massive invasions occur only rarely.
Juvenile stages of these moths were
first discovered in Iceland in 1974 and
1976. On 20 September 1974 a pupa of
Autographa gamma L. was found on a
lettuce plant (Lactuca) from a vegetable
garden in Gardabær near Reykjavík (leg.
Hreggvidur Thorgeirsson). The pupa
hatched on 27 September.
On 10 September 1976 a single larva
A.-Skaft., Iceland
of the species Agrolis ipsilon Hufn. was
found in a potato field at Kvlsker, S.F.-
Iceland (leg. Hálfdán Björnsson). The
larva was taken lrom the grass Poa annua.
It developed to a íull-grown moth, which
hatched on 17 October.
From the middle of August until early
September 1976 rnany larvae at various
stages belonging to the species Phlogo-
phora meticulosa L. were collected and
observed in a garden at Kvísker mainly
on Centaurea montana but also on Aco-
nitum napellus (leg. Hálfdán Björnsson).
Larvae were raised on Centaurea leaves
and lour pupated, hatching on 29 Sept-
ember, 18 and 25 October, ancl 10 Nov-
ember.
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