. Bulletin of the British Ornithologists' Club. Bulletin Vol. 88 rather than pear shaped. Two hybrid specimens with penelope, one from known parents and one from putative parents, are identical. They are a little larger than clypeata and show the roundness of penelope, giving them a more typical anatine form. Two specimens of a penelope x sibilatrix hybrid have been seen and in one the bulla is nearest that of the former but is a little larger and slightly more bulbous. However, the second speci- men is smaller than either parent but has the same general form of the first. americana has
. Bulletin of the British Ornithologists' Club. Bulletin Vol. 88 rather than pear shaped. Two hybrid specimens with penelope, one from known parents and one from putative parents, are identical. They are a little larger than clypeata and show the roundness of penelope, giving them a more typical anatine form. Two specimens of a penelope x sibilatrix hybrid have been seen and in one the bulla is nearest that of the former but is a little larger and slightly more bulbous. However, the second speci- men is smaller than either parent but has the same general form of the first. americana has a small bulla which is not bulbous nor particularly rounded (Fig. 2). The hybrid with a putative falcata is intermediate in size and form showing some of the roundness of this parent and the A. cyanoptera Hybrids (2) Fig. 3. Syringes of hybrid Anatini—crosses with the Garganey. Ventral view x } querquedula has a syrinx which differs from the rest of the Anatini. The bulla is flask shaped (Fig. 3), and lies ventrally over both the bronchi with the larger lobe over the right bronchus. The syrinx of strepera is typically anatine but the hybrid, while of similar size to both parents, shows some of the characteristics of querquedula. The bulla extends but little to the left, and the right apex, while still between the bronchi, is enlarged and rounded. The small syrinx of cyanoptera has the left apex of the bulla displaced posteriorly. The larger of two hybrid specimens, of putative. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Ornithologists' Club. London : British Ornithologists' Club
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