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Insect life London, A. & C. Black, ltd, 1921. arthropoda entomology libraries laboratory manuals trogonoptera brookiana arthropod, This visual showcases two striking specimens of the Ornithoptera brookeana butterfly, highlighting the distinctive differences between the male and female. The upper section features the male, characterized by its vibrant green markings and intricate wing patterns that display a dazzling combination of colors. Below, the female exhibits a more subdued palette with darker tones, yet still shows a remarkable pattern that emphasizes her elegance. Both butterflies are positioned symmetrically to demonstrate their size and features effectively, making this an educational representation of sexual dimorphism in the species. The plate is labeled ''Plate XVI'' and provides a clear view of the beauty and diversity found within the butterfly family. (Photo by: Sepia Times/Universal Images Group via Getty Images)