In this concluding part of the proposal for the standardised Lepidoptera database (see Metamorphosis Vol 6 No. 1), the field definitions, data entry format and suitable computer programmes are specified. The field definitions are proposed to consist of up to seven separate databases that are linked together.

The rearing of broods of C. ethalion ethalion and C. vansoni is described, with specific emphasis on the differences between adults fed as larvae on the natural foodplant and on an acceptable alternative.  The differences found between adults of C.e.ethalion were subjected to statistical analysis, and found to be highly significant for males, but less so for females.  Antenna/forewing ratios were significantly different, showing that this measure, normally used as a test to distinguish between species, can vary significantly within a species.

Early sightings, results of rearing imagines from larvae, seasonal dimorphism, sex ratios and parasitoids of Pieris brassicae are recorded and discussed.