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Portax picta, dorsal crest and throat-tuft of; sexual differences of colour in. Portunus puber, pugnacity of. Potamochoerus pencillatus, tusks and facial knobs of the. Pouchet, G., the relation of instinct to intelligence; on the instincts of ants; on the caves of Abou-Simbel; on the immunity of negroes from yellow fever; change of colour in fishes.
Blyth informs me, with an exactly similar series of facts, as in the Portax picta, namely, in the male periodically changing colour during the breeding-season, in the effects of emasculation on this change, and in the young of both sexes being indistinguishable from each other. On the Ant. niger, see 'Proc. Zool. Soc. 1850, p. 133.
Ottawa Acad. Nat. One of the above-named antelopes, the Portax picta, has a large well-defined brush of black hair on the throat, and this is much larger in the male than in the female. In the Ammotragus tragelaphus of North Africa, a member of the sheep-family, the fore-legs are almost concealed by an extraordinary growth of hair, which depends from the neck and upper halves of the legs; but Mr.
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