In the year of 1929, I brought back a live female of Streptopelia b. bitorquata from the Batavian Market in Java, and it has mated in my aviary with a wild male of Streptopelia d. decaocto from Saitama Prefecture, Hondo, Japan. In the spring of 1933, this pair of the two different species have produced a pair of hybrids between them. These hybrids seem to me quite new to science, so that I describe them as follows.
S. d. deeaocto _??_×S. b. bitorquata _??_.
Diagnosis. -Very similar in colour to S. d. decaocto; but it resembles bitorquata in the following points: the forehead and the crown of head are pale grey, the hind-neck and sides of neck washed with a very pale vinous, and there is a black semi-ring on the hind-neck bordered by a very distinct white semi-ring on the upper and lower margins. Thegrey of the sides of the head is much paler than in both parents and so is the general colour of the upper side of the body. These parts are the characteristics of the hybrids. They have the dominant characters of S. d. decaocto rather than those of S. b. bitorquata. They seem to be sterile as they have not yet produced F₂.
Locality. -Hatched in my aviary at Akasaka, Tokyo, in the spring of 1933.

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