Cromwell chafer  (Prodontria lewisi)

Endemic: A species or taxonomic group that is only found in one particular country or geographic area.
Larval stage: Stage in an animal's lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
Nocturnal: Active at night.
Pupae: Stage in an insect's development when huge changes occur, which reorganise the larval form into the adult form. In butterflies the pupa is also called a chrysalis.

1. IUCN Red List (February, 2008)
   http://www.iucnredlist.org
   
2. New Zealand Department of Conservation: Beetles- scarabs and staphylinids. Scarab beetles: dung beetles, chafer beetles (February, 2008)
   http://www.doc.govt.nz/upload/documents/conservation/native-animals/invertebrates/014-beetles-scarabs-and-staphylinids.pdf
   
3. Ferreira, S.M. and McKinlay, B. (1999) Conservation monitoring of the Cromwell chafer beetle (Prodontria lewisii) between 1986 and 1997. Science for Conservation 123. Department of Conservation, Wellington, N.Z. Available at:
   http://www.doc.govt.nz/upload/documents/science-and-technical/sfc123.pdf
   
4. The State of Our Invertebrate Animals. New Zealand Ministry of the Environment (March, 2004)
   http://www.mfe.govt.nz/publications/ser/ser1997/html/chapter9.7.2.html