. British birds. Birds. OTES. ON THE PERSISTENCE OF THE RIGHT OVARY AND ITS DUCT IN BIRDS. With reference to the notes on this subject (c/. antea Vol. IV., pp. 188 and 216), I think it may be worth while to put on record, that on March 19th, 1911, I received a female Lesser Kestrel {Falco cenchris) which had been shot the day before near Empoli (Tuscany, Italy), and on dissecting it I discovered that it had both ovaries equally well developed, but the right oviduct was not so wide as the left. This bird is in the rare stage of plumage, due to age, I .-po crpo^c^ think, of an old female that ha
. British birds. Birds. OTES. ON THE PERSISTENCE OF THE RIGHT OVARY AND ITS DUCT IN BIRDS. With reference to the notes on this subject (c/. antea Vol. IV., pp. 188 and 216), I think it may be worth while to put on record, that on March 19th, 1911, I received a female Lesser Kestrel {Falco cenchris) which had been shot the day before near Empoli (Tuscany, Italy), and on dissecting it I discovered that it had both ovaries equally well developed, but the right oviduct was not so wide as the left. This bird is in the rare stage of plumage, due to age, I .-po crpo^c^ think, of an old female that has (in cC^^o& '^S'oH V'^"^^) acquired the plumage of the f^^O ^^Si^ adult male. The feathers of the f^ °i§'^ crown have a blue-grey central stripe ^^^ becoming paler towards their mar- ^f^- ^tlK ^^^^' ^^'^i^h are light rufous; sides ^ / " of the head, of the neck, and of Ovaries ot Falco cenchris, ^^^ upper-breast bluish-ash ; rump, specimen a, 18th March, upper tail-coverts and tail of a sizeV ^'^^^^^^^ bright blue-grey, this latter slightly barred and with a broad subterminal black band, and broadly tipped with white ; a few narrow lines and small spots on the mantle ; upper-breast narrowly streaked, the lower-breast and flanks with a few blackish spots. I am not aware of any recorded instance of the present species assuming a plumage resembling that of the adult male, as appears to be the case, not very infrequently, in very old females of F. tinnunculus. In about twenty years' experience, some thousands of specimens of many species have come into my hands. I have always paid special attention to the sexual glands of the females, and have accumulated notes on this subject. The case of F. cenchris seems to me of a peculiar interest, because it is the first time that I have found both ovaries present in this species. I venture to add a list of the birds which have passed through my hands with the right as well as the left ovaries present, because I can record so
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