78 3. IGUANIDJE 



side nest of a prairie falcon where, on June 6, 1914, two 

 nearly grown young falcons set up a squawking chorus at 

 my approach." 



Mr. Raymond B. Cowles, states that "During August of 

 1919 they were seen in pairs and seemed to be breeding. 

 Observations seemed to show that a given pair occupied the 

 same territory and rarely traveled far from it. They were 

 seen most of the hottest days, feeding on the leaves of 

 some of the low desert shrubs. Upon being frightened they 

 would drop from the branches and run rapidly, with the 

 entire body raised from the ground, to the nearest burrow, 

 where they would remain for half an hour or more before 

 reappearing. On cloudy days, even though the tempera- 

 ture remained above 100 F. they were seldom seen and 

 appeared to be very sluggish, sometimes allowing one to 

 approach to within a few feet of them before running. 



"Their food seemed to be almost exclusively plants, 

 and they preferred the leaves of an alfalfa plant which hap- 

 pened to be growing near their chosen range. During an 

 entire summer, June 25 until September 25, they were seen 

 eating insects only once. The specimen eating the insect 

 escaped and it is not known what insect it might be, though 

 from a distance it appeared to be one of the Acrididse." 



7. Dipsosaurus dorsalis lucasensis Van Denburgh 

 SAN LUCAS CRESTED LIZARD 



Dipsosaurus dorsalis BAIRD, Proc. Acad. Nat. Sci. Phila., Vol. XI, 1859, 

 p. 299; BOCOURT, Miss. Sci. Mex.,Rept., 1874,p. 146; YARROW, Bull. 

 U.S.Nat. Mus., No. 24, 1883, p. 54 (part); BOULENGER, Cat. 

 Lizards Brit. Mus., Vol. II, 1885, p. 201 (part); COPE, Bull. U. S. 

 Nat. Mus., No. 32, 1887, p. 34; BELDING, West. Amer. Scientist, 

 Vol. Ill, No. 24, 1887, p. 97; VAN DENBURGH, Proc. Cal. Acad. 

 Sci., Ser. 2, Vol. 5, 1895, p. 92 (part); COPE, Report U. S. Nat. 

 Mus. for 1898, 1900, p. 243 (part); TERRON, Mem. y Rev. Soc. 

 Cient. Antonio Alzate, Vol. 39, 1921, pp. 165, 168. 



