The Essex Naturalist
101
Genus: Lasius. There are records for nine of the ten currently accepted British
species.
Lasius alienus s.l.
National status Local
[L. alienus Foerster & L. psammophilus Seifert]
Seifert (1992) has recently split L. alienus s.l. into two species found in Britain
L. alienus (Foerster) and L. psammophilus Seifert. It has been possible to examine
most of the Essex specimens of L. alienus s.l. and we appear to have both species
in the county although they are rare. An older record for Havering-Atte-Bower
Roundhouse (TQ5093) in 1984 by the Passmore Edwards Museum Survey Team
has not been critically examined. Barrett (1979) shows a pre 1961 record for
TM02 and post 1961 record for TL70.
L. alienus (Foerster) [s.s.]
National status Unknown County status Essex Rare
Threat status Essex Vulnerable Frequency Ratio 1.0
Tetrad Percentage 0.2% Recorded 1km sq. percentage 0.4%
L. alienus (Foerster) [s.s.]
Distribution
There are records for only two localities, at Bartlow Hills just inside North Essex
and a very small area just south of Hadleigh Castle in South Essex.