44-45. First spermatocyte, spireme stage showing the unequal pair of heterochromosomes.
46. First spermatocyte, prophase.
47-49. First spermatocyte, metaphase.
50-51. First spermatocyte, equatorial plates, x the heterochromosome pair.
52. First spermatocyte, showing metakinesis of the unequal pair.
53. First spermatocyte, anaphase.
54-55. Second spermatocyte, equatorial plates.
56. Second spermatocyte, anaphase.
Odontota dorsalis (Family Chrysomelidæ).
57. Equatorial plate of male somatic cell from walls of the testis, 15 large chromosomes, 1 small one.