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In Tillus elongatus the male is black, and the female always, as it is believed, of a dark blue colour, with a red thorax. The male, also, of Orsodacna atra, as I hear from Mr. Bates's collection, are generally redder but rather duller than the females, the latter being coloured of a more or less splendid golden-green.
Orsodacna ruficollis. Orthoptera, metamorphosis of; stridulating apparatus of; colours of; rudimentary stridulating organs in female; stridulation of the, and Homoptera, discussed. Ortygornis gularis, pugnacity of the male. Oryctes, stridulation of; sexual differences in the stridulant organs of. Oryx leucoryx, use of the horns of. Osphranter rufus, sexual difference in the colour of.
Oriolus melanocephalus, coloration of the sexes in. Ornaments, prevalence of similar; of male birds; fondness of savages for. Ornamental characters, equal transmission of, to both sexes, in mammals; of monkeys. Ornithoptera croesus. Ornithorhynchus, reptilian tendency of; spur of the male. Orocetes erythrogastra, young of. Orrony, Grotto of. Orsodacna atra, difference of colour in the sexes of.
Walsh, B.D., on the proportion of the sexes in Papilio Turnus; on the Cynipidae and Cecidomyidae; on the jaws of Ammophila; on Corydalis cornutus; on the prehensile organs of male insects; on the antennae of Penthe; on the caudal appendages of dragonflies; on Platyphyllum concavum; on the sexes of the Ephemeridae; on the difference of colour in the sexes of Spectrum femoratum; on sexes of dragon-flies; on the difference of the sexes in the Ichneumonidae; on the sexes of Orsodacna atra; on the variation of the horns of the male Phanaeas carnifex; on the coloration of the species of Anthocharis.
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