Seems a curious decision, but they'll save a lot of money.

http://www.thenorthernecho.co.uk/sport/cricket/4126662.Durham_do_without_an_overseas_player/

if you read the article they

1. are foregoing an overseas player til Chanderpaul is available in July
2. may still sign an overseas player for the T20
3. will rely on di Venuto (Australia) and Benkenstein (SA) for their runs
4. were going to sign Hughes from Australia til he was picked for Test team

so don't build your hopes up that Durham have gone all politically correct - like us they have been searching long and hard but just not found anyone!