"sw" wrote in message
...
Brian Watson wrote:

The bodies have a kind of blotchy, almost zigzag dark pattern when
viewed
from above, and the pipe-type "tail" is actually about as long as the
body.

Any ideas?

Some type of hoverfly larva? Specifically that known as the 'rat-tailed
maggot', the larva of the Drone Fly _Eristalis tenax_ (the tube is very
extensible). I have these in my half-barrel 'pond' and would not be
surprised to find them in a water butt to which the adults could gain
access. They are harmless, and the adults are good pollinators.

http://res2.agr.ca/lethbridge/scitech/kdf/rat_e.htm

Excellent! That's the one, I'm sure.

"Adults feed on nectar and probably serve a minor beneficial role by
pollinating flowers" and "harmless to livestock, pets and people"

Thank you very much.

--
Brian
"Stuck down a hole, in the fog, in the middle of the night, with an owl."