Fróðskaparrit - 01.01.1993, Blaðsíða 110

114
THE LEAFHOPPERS (HOMOPTERA, AUCHENORRHYNCHA) OF THE FAROE ISLANDS
found in Reykjavik in Iceland. We also
knew, that elm trees (i.e. Ulmus glabra )
had been planted more than a hundred
years ago in downtown Tórshavn (Høj-
gaard etal., 1989). If any of these trees still
existed, there would be a good chance of
finding the specíes. On August 31 st we
found a single specimen on a fir tree in the
plantation in Tórshavn. We knew then, that
there must be at least one elm tree some-
where near, and we did fmd it downtown on
Sep. 5th 1992 in the old garden to “Christi-
nesminde” with an entrance surrounded by
the lower jaw from the largest finwhale
caught in the Faroes (Michelsen, 1930).
Ribautiana ulmi is widespread in Eu-
rope, including Scotland and Norway and
has been introduced into North America.
Streymoy: Tórshavn, 31 August 1992 (P.Ketil/L.Trolle)
Tórshavn, 5 September 1992 (P.Ketil/L.Trolle)
7. Macrosteles ossiannilssoni Lindb.,
Figs. 13 and 14. New to the Faroes,
map, Fig. 48.
1 mm.
Fig. 13: Macrosteles ossiannilssoni Lindb. male
Streymoy, Dalá - 22 August 1992
Fig. 14: Macrosteles ossiannilssoni Lindb. female
Eysturoy, Svínáir - 24 August 1992
The genus Macrosteles is a “difficult’’ one.
The markings on the head may give a clue
to the species, but are unfortunately very
variable at least in some species. The male
is readily identified by the shape of the
aedeagus and the apodemes of the 2nd ab-
dominal stemum. While the females of
some species can be identified with certain-
ty, the females of the so-called sexnotatus-
group cannot be identified. On the Faroes
the main problem is to separate M. ossian-
nilssoni-females from M. /aevA-females