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of hybrids behave slightly differently in respect to the extent in which union in
pairs takes place. The cause of this peculiar behaviour of the chromosomes is
to be found in the faet, that the affinity between homologous chromosomes of
the same species is lacking between the chromosomes of different species, united
in the hybrids.
Anachoreta Curtu/a Pigra
30Chr. 29 Chr. 23 C hr.
59
Ap x Cd
58
59
57
Pp x Cd
9-8
48
Ap. 30 Chr. (Ap x Cd) cf 59 Chr.
Cp x Pd
47
56
Ap x (Ap x C d) d
59
-•** •’
EXPLANATION OF PLATE.
FIRST AND SECOND SPERMATOCYTE EQUATORIAL PLATES OF PYGAERA ANACHORETA. CURTULA AND PIGRA.
First spermatocyte equatorial plates of the hybrid anachoreta 9 x curtula cT with 58—59 chromo*
somes, so that none or only two chromosomes have united to form a pair. All the others are
about half the size of the first and about the same size as the second spermatocyte chromosomes
of the parent species.
First spermatocyte equatorial plates of secondary hybrid P. anachoreta $ x (P. anachoreta $ x P.
curtula c?) c? with 56 and 59 chrosomomes, (latter in two sections). Of the chromosomes about
30 are large, and consist of two units, paired together, presumably anachoreta chromosomes; about
26, resp. 29, are small, unpaired, presumably univalent curtula chromosomes.
First spermatocyte equatorial plates of the reciprocal hybrids between P. curtula and P. pigra: the
chromosome number is 47—51, there is thus only 1—4 paired chromosomes, all others are univalent.
The figures mark the chromosome number after the maturation*division.
U-
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