
Appearance
The species of Pierella have larger hindwings than forewings, unique among butterflies. The oval green flash on the forewing is also unique. It is caused by diffraction, the wing scales forming a diffraction grating.
Naming
SubspeciesPierella hyalinus hyalinus (Gmelin, [1790]) (= Papilio hyalinus, Pierella hyalinus fusimaculata, Pieris dracontis)
Pierella hyalinus extincta Weymer, 1910
Pierella hyalinus schmidti Constantino, 1995
Pierella hyalinus velezi Constantino, 1995

Reproduction
The life history of Pierella hyalinus fusimaculata (Brown) (Lepidoptera: Satyridae) is described from material reared in captivity on grasses in eastern Trinidad. The complete life cycle takes 84 days (8 days in the egg stage, 60 days in four larval instars, and 16 days as a pupa).References:
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http://www.troplep.org/TLR/1-1/pdf004.pdf