Proctostephanus madeirensis is a pale grey/violet species (up to 1.3 mm in length) which is known only from industrial waste tips in Swansea and Liverpool. It was probably introduced to the UK from Portugal or Madeira. Its most distinctive character is the prominent 'crown' on the dorsal side of the fifth abdominal segment (Fig. 1). This has not been recorded since 1977, despite Steve Hopkin and Peter Shaw separately sampling Collembola from a variety of brownfield sites including waste tips.