Europa-List: Not Europa but can any one identify this aeroplane.

[Pete Lawless <pete@lawless.info>]

Hi

Can anybody tell me what this aeroplane is?  The picture was taken by a
friend's grandfather at the end of WW1.  He was in the RFC.  Been 
looking at
all the likely suspects but none match.  My friend has a boyhood memory 
of
having been told the aeroplane was American.

Regards

Pete