183 CALIFORNIA ACADEMY OF SCIENCES [Peoc. 4th See. 



The grassy area commences at about 1500 feet and extends to 

 the rim of the crater at 3150 feet. 



General remarks. — While the lizards of these islands are so 

 similar that we have been able to find no characters which will 

 serve to distinguish them, they nevertheless are not absolutely 

 identical. The Indefatigable Island lizards have scales some- 

 what larger than those of the James Island specimens. A 

 similar average difference probably exists between the hzards 

 of Narborough and Albemarle. As may be seen when the 

 counts of the scales about the body are plotted, the curves for 

 the various islands do not coincide, although their bases over- 

 lap. It thus becomes evident that differentiation has begun on 

 these islands also, although it still is too intangible to be recog- 

 nized in momenclature. 



Conolophus subcristatus (Gray) 

 Land Iguana 



Trachycephahis subcristatus Gray^ Cat., p. 188. 



Amblyrhynchus subcristatus Gray^ Zool. Misc., 1831, p. 6, and Zool. 

 Beechy's Voyage, Rept, p. 93; Darwin, Journ. Beagle, p. 469. 



Amblyrhynchus demarlii Dum & Bibr., IV, p. 197; Bell, Zool. Beagle, 

 Rept, p. 22, pi. XII. 



Hypsilophus {Conolophus) demarlii Fitzinger, Syst. Rept., 1843, p. 55. 



Conolophus subcristatus Steindachner, Festschr. Zool.-Bot. Ges. 

 Wien, 1876, p. 322, pis. IV-VII; Gunther, Proc. Zool. Soc, 1877, p. 67; 

 BouL, Cat. Lizards, II, p. 187, 1885; Garman, Bull, Essex Inst., XXIV, 

 1892, p. 5 (part) ; Heller, Proc. Wash. Acad. Sci., V, 1903, p. 85. 



Conolophus subcristatus pictus Roth & Hart, Novit, Zool., VI, 1899, 

 p. 102. 



Diagnosis. — Rostral once and a half times as broad as 

 high; dorsal crest not so high as in C. pallidus; snout less 

 pointed; coloration above, yellow on head, neck and fore 

 limbs ; red, brown, or olive on back, hind limbs, and tail. 



Distribution. — The land iguana was formerly abundant on 

 James, Indefatigable, South Seymour, Albemarle, and Nar- 

 borough islands. It now is very rare on Albemarle, and prob- 

 ably extinct on James and Indefatigable. 



Material. — A few bones were collected on James. Sixteen 

 or eighteen specimens were secured on South Seymour, two 

 at Tagus Cove, Albemarle, and twenty-one on Narborough. 



There seem to be no constant differences between the speci- 

 mens at hand from these islands. The Narborough iguanas 

 have red backs, while the South Seymour ones usually have 



