THE CHROMOSOMES OF HABROBRACON

Abstract
There are 10 chromosomes in the normal haploid [male], 20 in the normal diploid [female], and 20 in the anomalous biparental diploid [male]. Spermatogonial counts were made in each type of [male]. Following the spermatogonial divisions both haploid and diploid [male][male] show an abortive 1st maturation division followed by an apparently equational 2nd maturation division. Metaphase plates in secondary spermatocytes gave counts similar to those of spermatogonial plates. The 2 cells resulting from the 2nd maturation division metamorphose into mature sperm cells.

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