, . diapause post-diapause chilling? 
(genetic — ** ► vernal adult 
pupa 
diapauser 
1978] 
Shapiro — Pierid Butterflies 
277 
1. Schematic representation of developmental and phenotypic options available to Pieris napi. Not all options 
in all populations, but all except those queried have been demonstrated in the laboratory. 
