They sound like greenfly - perversely these are often white (dead?
       cast-off skins?)  There's an easy way to tell though - tap the plant.
       If they fly away, they're whitefly.  If they don't, they're greenfly
       (or maybe mealy bugs, fluffy scale, whatever.)  This makes whitefly
       quite a menace, as they'll just distribute themselves around your 
       collection.  I like the yellow card and vaseline idea that was 
       mentioned the other day - must try it.
       Happy exterminating,
                         Peter 
snail:Peter Cole,17 Wimmerfield Cr. :mailto:carnivor@bunyip.demon.co.uk
     Killay, SWANSEA SA2 7BU, WALES :http://www.angel.co.uk/flytrap/index.htm
  vox:+44 1792 205214               :carnivorous plants, didjeridu & caving