stage.

283-284. First spermatocyte, growth stages.

285. First spermatocyte, prophase.

286-287. First spermatocyte, later prophases, showing the
heterochromosome pair (_x_).

288. First spermatocyte, metaphase.

289. Second spermatocyte, metaphase.

290. First spermatocyte, equatorial plate.

291-292. Second spermatocyte, equatorial plates.

_Euvanessa antiopa_ (_Lepidoptera_).

293. First spermatocyte, equatorial plate.

[Illustration: STEVENS PLATE XV.

N. M. S. del.

HEMIPTERA AND LEPIDOPTERA]

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