No. 624] 



REACTIONS OF PHRYNOSOMA 



53 



1898. The Crocodilians, Lizards and Snakes of North America. Re- 



port V. S. N. M., 1898: 153-1270. 



Dice, L. E. 



1916. Distribution of the Land Vertebrates of Southeastern Washing- 



ton. Uni. Cal. Publ. Zool., 16: 293-348. 

 Ditmars, E. L. 



1908. The Eeptile Book. New York. 



1853. A Monographic Essay on the Genus Phrynosoma. Stansbury's 

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Grinnell, Jos. 



1917. Field Tests of Theories Concerning Distributional Control. 



Am. Nat., 51: 115-128. 

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1899. Notes on a Collection of Lizards from New Mexico. Bull. 



Sci: Lab. Dennison Vni., 11: 117-148. 

 Nelson, J. W., Holmes, L. C, and Etkmann, E. C. 



1914. Soil Survey of the Middle Eio Grande Valley Area, New Mexico. 



U. S. D. A., Advance Sheets, Field Operations, Bureau of 

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1907. Influence of Light and Heat on Melanophores. Jonr. Ex. Zool., 



Eedfield, Alfred C. 



1917a. The Eeactions of the Melanophores of the Horned Toad. 



Froc. Nat. Acad. ScL, 3: 3. 

 1917&. The Coordination of the Melanophore Eeactions of the Horned 



1903. Some Experiments in Feeding Lizards with Protectively Col- 

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 Euth, E. S., and Gibson, E. B. 



1917. Disappearance of the Pigment in the Melanophores of Philip- 

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1911. Physiological Animal Geography. Jour. Morph, 22: 552-618. 



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tion. Biol. Bull, 23: 331-370. 

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1913b. The Eeactions of Certain Animals to Gradients of Evaporat- 

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1915. Principles and Problems of Ecology as Illustrated by Animals. 

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 . Geog. Bev., 



