link:
http://www.telegraph.co.uk/earth/main.jhtml?xml=/earth/2008/07/15/eabug115.xml

A photo is included in the article, direct link is:
http://www.telegraph.co.uk/earth/graphics/2008/07/15/eabug115.jpg

Snip:
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Insect experts at the Natural History Museum have been unable to
identify an insect found in their grounds, despite the museum holding
28 million specimens in its collection.

A tiny red and black bug has baffled experts after being found in the
grounds at the Natural History Museum. The unidentified bug, which
was discovered last spring, is not believed to be native to Europe

The tiny red and black bug, which has baffled specialists from across
Europe, has been spotted all over London and experts believe it could
spread across Britain.

Max Barclay, an entomologist at the museum, discovered the insect last
spring. "I was in the gardens with my son and there was one under the
gate," he said. "I thought, 'That looks interesting, I've never seen
anything like that before'.