One of my correspondents in Vienna (Austria) obtained a remarkable
success in the rearing of Roylei. From the twenty-five eggs he had
twenty-three larvae hatched, which produced twenty-three fine cocoons.
The same correspondent, with thirty-five eggs of _Samia gloveri_,
obtained twenty cocoons. My other correspondents did not obtain any
success in rearing these two species, as far as I know.

_Hybrid Roylei-Pernyi_.--I have said that it is extremely difficult to
obtain the pairing of Roylei moths in captivity. But the male Pernyi
paired readily with the female Roylei. I obtained six such pairings, and
a large quantity of fertile ova. The pairings of Roylei (female) with
Pernyi (male) took place as follows: two on the 21st of May, one on the
3d of June, two on the 4th of June, and one on the 6th.

The larvae of this new hybrid, _Roylei-Pernyi_, contrary to what might
have been expected, were much easier to rear than those of Roylei, and
the cocoons obtained are far superior to those of Roylei, in size,
weight, and richness of silk. The cocoon of my new hybrid has, like
Roylei, an envelope, but there is no space between this envelope and the
true cocoon inside. Therefore, this time, the crossing of two different
species (but, it must be added, two very closely allied species) has
produced a hybrid very superior, at least to one of the types, that of
Roylei. The cocoons of the hybrid _Roylei-Pernyi_ seem to me larger and
heavier than any Pernyi cocoons I have as yet seen.

The larvae of this new hybrid have been successfully reared in France,
in Germany, in Austria, and in the United States of North America. The
cocoons obtained by Herr L. Huessman, one of my German correspondents,
are remarkable for their size and beauty. The silk is silvery white.