Dipper (closely allied races inhabit other parts of the Palæarctic Region).
2. Parus cristatus
Crested Titmouse.
3. Anthus obscurus
Rock Pipit.
4. Linota rufescens
Lesser Redpoll (closely allied races in N. Asia and N. America).
5. Loxia pityopsittacus
Parrot Crossbill (a closely allied form in N. Asia).
We find, that out of a total of 118 British Passeres there are:
32 species which range to North Africa and Central or East Asia.
25 species which range to Central or East Asia, but not to North Africa.
43 species which range to North Africa and Western Asia.
6 species which range to North Africa, but not at all into Asia.
7 species which range to West Asia, but not to North Africa.
5 species which do not range out of Europe.
These figures agree essentially with those furnished by the mammalia, and complete the demonstration that all the temperate portions of Asia and North Africa must be added to Europe to form a natural zoological division of the earth. We must also note how comparatively few of these overpass the limits thus indicated; only seven species extending their range occasionally into tropical or South Africa, eight into some parts of tropical Asia, and six into arctic or temperate North America.
Range of East Asian Birds.—To complete the evidence
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