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HONG KONG BUTTERFLIES
V. R. BURKHARDT
Richard South, the author of the most popular handbook of British butterflies, prefaces his work by saying, "Almost everyone admires the wild flowers that Nature produces so lavishly, and in such charming variety of form and colour; but, in addition to their own proper florescence, the plants of woodland, meadow, moor, and down have other blossoms that arise from them, although they are not of them. These are the beautiful winged creatures called butterflies, which, as crawling caterpillars, obtain their nourishment from plant leafage, and in the perfect state help the bees to rifle the flowers of their sweets, and at the same time assist in the work of fertilisation.
English butterflies rarely obtrude themselves on the stroller's gaze apart from the whites which devastate his cabbages, and the apparently aimless flight of the Meadow Brown, when crossing a hayfield. The real country lover passing through the leafless copse on a sunny windless day in February, may be heartened by the sight of the sulphur yellow of the male Brimstone which, as the "butter-coloured fly", gives its English name to the whole race. In Hong Kong, the most unobservant cannot fail to notice the brilliant "aerial flowers" referred to by the British naturalist, as the purple shot Euploeas, or the yellow Euremas pass him in the very centre of the city.
Though the Colony lies just within the tropic of Cancer, at least seventy per cent of its butterflies are Palaearctic, that is to say, to be found normally in a zone running from Africa north of the Sahara across Europe and Asia to Japan and Formosa. The geology and climate of the Colony both militate against the luxurious vegetation associated with a tropical country. Though much has been done by the Government in the way of afforestation, there has not been time since the British occupation to produce the leaf mould and rich subsoil found in primitive jungle and forest, and the flora on which the larvae of butterflies feed is much more restricted than in countries like Malaya and Indonesia.
Early collectors identified about 140 different species of butterflies in the Colony, and J. C. Kershaw in his "Butterflies of Hong