Butterflies of Norway

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BOLORIA IMPROBA

 

English name: UK: Dusky-winged Fritillary. US: Dingy Arctic Fritillary.
Norwegian name: Dvergperlemorvinge.
Auctor: (Butler, 1877)
Original description: as Argynnis Improba in Ent. Month. Mag., 13 : 206.
Syn.: - - -
Type locality of nominate species: Winter Cove and Cambridge Bay, NW Territories, Canada.
Worldwide distribution: Mountains of Arctic Fennoscandia. Polar tundra of Siberia to Chukotka, even Novaya Zemlya Is., Alaska,
North-western Canada, small areas of Colorado and Wyoming.
Subspecies in Norway: B.i.improbula.
Recognized subspecies: B.i.improba (Butler, 1877) - Alaska, North-west Canada.
B.i.acrocnema - San Juan Mts., Colorado.
B.i.harryi - Wind River Mts., Wyoming.
B.i.improbula Brykner, 1920 - Northern Fennoscandia.
Notes: According to Tuzov & al. (2000), specimens from East Chukotka (the extreme North-East tip of Russia, at the
Bering Strait) resemble f. youngi (Holland, 1900), a yellowish form described from Alaska.
 

 

B.improba improbula

Auctor: (Bryk, 1920)
Syn.: as Argynnis improba f. improbula in Ent. Tidskrift, 41:131.
Type locality of subspecies: Torneträsk, Swedish Lapland.
Distribution in Norway: Mountains of inner Troms, North Norway.
Notes: B.improba is one of Norway's rarest butterflies. Until recently, the only confirmed records from Norway were from
1893 (leg. Hans Jacob Sparre Schneider), 1922 (leg. Tron Soot-Ryen) and 1948 (leg. Henrik Bruun).

But in 2008 a previously unknown population was found in Bardu kommune (leg. Lars Andersen).

Today improba is recorded from localities in Troms regions, elevation approx 900 - 1130 m above sea-level.
B.improba inhabits the most exposed glacial plateaus, where it flies close to ground, or just crawls among low
flowers in the strong wind.
Described forms found in Norway: - - -
Etymology: improba: improbus = below standard, of bad quality, poor, inferior (a rather improper name for a butterfly surviving
in some of this planet's most harsh areas!).
improbula is a patronymic derivation from improba.
 




impr-19.JPG (12171 bytes)

1 2 3


BOLORIA  IMPROBA  IMPROBULA

Specimen

EIS

Region

Kommune

Coll. date

Legit

In coll.

Remarks

1 147 TRI Bardu 18-VII-1893 Hans Jacob Sparre Schneider ZMO m
2 148 TRI Målselv 20-VII-1922 Tron Soot-Ryen ZMO m
3 156 TRI Storfjord 10-VII-1948 Henrik Bruun ZMO m






impr-28.JPG (42267 bytes)

1 2 3


BOLORIA  IMPROBA  IMPROBULA  -   vental view

Specimen

EIS

Region

Kommune

Coll. date

Legit

In coll.

Remarks

1 147 TRI Bardu 18-VII-1893 Hans Jacob Sparre Schneider ZMO m
2 148 TRI Målselv 20-VII-1922 Tron Soot-Ryen ZMO m
3 156 TRI Storfjord 10-VII-1948 Henrik Bruun ZMO m



For further notes, photos and maps of this species, check out
the Lepidoptera homepage of the Zoological Museum of Oslo/Norwegian Entomological Society/Skogforsk
(text in Norwegian).


 

Butterflies of Norway | Systematic list of the Norwegian butterflies | Bibliography
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