Posted by Steve Crellin on 27-01-2015 12:17
#16
John Carr wrote:
Quaedfliegh wrote:
I haven't found that yet. It seems that the continental Western European species do not seem to like travelling. England used to be connected to the continent yet it lacks quite some species when compared to the Netherlands and Belgium (and a lot when compared to France), like Antipalus varipes, Dysmachus (Didysmachus) picipes, Paritamus (Neomochtherus)geniculatus, Neoitamus socius, and then some. But that common species like Machimus (Tolmerus) atricapillus and Dysmachus trigonus (present in England) couldn't make it IOM or Ireland makes one wonder....But as John Carr mentioned that D. hyalipennis has been introduced into North America why not in Ireland. Was it introduced on purpose?
There is no reason to introduce such a generalist predator intentionally. I am sure it was accidentally introduced.
A number of insects seem to have arrived on Man in recent years either by hitching a lift or under their own power. Examples include
Osmia rufa,
Dolichovespula media and
Harmonia axyridis. Sadly from my point of view, no new asilids!