The distribution of bird life The distribution of bird life in the Urubamba valley of Peru; a report on the birds collected by the Yale university National geographic society's expeditions distributionofbi00chap Year: 1921 36 BULLETIN 117, UNITED STATES NATIONAL MUSEUM. 9? 90° 6S° BO' 75° 70* 65° 601 5S* Stf 4? 4<? 3? 30' 2S° Fig. 2.—semi-diagrammatic representation of the range of heliochera, a very distinct cotingine genus restricted to the forests of the humid temperate zone, which has pre- sumably been derived from a forest-inhabiting ancestor of the humid tropical zone at the base
The distribution of bird life The distribution of bird life in the Urubamba valley of Peru; a report on the birds collected by the Yale university National geographic society's expeditions distributionofbi00chap Year: 1921 36 BULLETIN 117, UNITED STATES NATIONAL MUSEUM. 9? 90° 6S° BO' 75° 70* 65° 601 5S* Stf 4? 4<? 3? 30' 2S° Fig. 2.—semi-diagrammatic representation of the range of heliochera, a very distinct cotingine genus restricted to the forests of the humid temperate zone, which has pre- sumably been derived from a forest-inhabiting ancestor of the humid tropical zone at the base of the andes. the humid temperate zone forest, and hence the distribution of the genus, is doubtless less continuous than is here indicated.
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