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Primary sexual organs. Primates, sexual differences of colour in. Primogeniture, evils of. Prionidae, difference of the sexes in colour. Proctotretus multimaculatus. Proctotretus tenuis, sexual difference in the colour of. Profligacy. Progenitors, early, of man. Progress, not the normal rule in human society; elements of. Prong-horn antelope, horns of.
In the Indian Calotes nigrilabris there is a still greater difference; the lips also of the male are black, whilst those of the female are green. In the Proctotretus tenuis of Chile the male alone is marked with spots of blue, green, and coppery-red. For Proctotretus, see 'Zoology of the Voyage of the "Beagle"; Reptiles, by Mr. Bell, p. 8.
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