pierine

— Rather than reviewing the physics and physiology of butterfly thermoregulation here, I will simply note that thermoregulatory advantage is not yet proven for the seasonal phenotypes of any pierine, though strongly suspected; increased survivorship […]

— The bearing of the geographical distribution of existing Pierine forms upon the preceding phylogenetic conclusions was then considered, and it was shown that the facts of distribution, taken in connection with what was known of the means of transit possible for insects, and especially of the migratory habits of certain Pierines, were in general accordance with the same conclusions.