136 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



T. paciiicus (var. Habelii). Craniopeltis bivittata Peters was 

 regarded as a synonym of Tropidurus (Craniopeltis) Grayii, 

 which was said to occur on Chatham, Charles, Albemarle, 

 James, Indefatigable, and Jervis islands. 



In 1877, Dr. Giinther recorded the specimens secured by 

 Cookson, during the visit of the "Peterel." The Albemarle 

 lizards were regarded as Liocephalus Grayii (Bell), while 

 those from Abingdon were referred both to this species and 

 to L. paciiicus (Steind.). Steindachner was followed in re- 

 garding Craniopeltis bivittata Peters as a synonym of L. 

 Grayii. 



Boulenger in his Catalogue of Lizards, 1885, accepted the 

 views of Giinther, but placed these lizards in the genus Tropi- 

 durus. 



In reporting upon the collections made by the "Albatross" 

 in 1887-88, Professor Cope, in 1889, recorded Tropidurus 

 grayi from James, Gardner, Hood, Indefatigable, Albemarle, 

 and Duncan islands. The Duncan specimens were mentioned 

 as a variety with a dark lateral band not very distinct. Speci- 

 mens from Abingdon were referred to Tropidurus pacificus, 

 while those from Chatham were described as a new species, 

 Tropidurus lemniscatus. 



The following year, Dr. George Baur studied these speci- 

 mens collected by the "Albatross," one hundred and twenty- 

 eight in number, and published his conclusion that nearly 

 every island has its peculiar variety or species of Tropidurus, 

 and no island has more than one kind. He described five new 

 species, and stated the distribution of Tropidurus, in the archi- 

 pelago to be as follows : 



Tropidurus Grayii Bell Charles Island 



" lemniscatus Cope Chatham Island 



" paciiicus Steindachner Bindloe Island 



" Delanonis Baur Hood and Gardner islands 



" Alhemarlensis Baur Albemarle Island 



" indefatigabilis Baur Indefatigable and James islands 



" Duncanensis Baur Duncan Island 



" Ahingdonensis Baur Abingdon Island 



The name Tropidurus Delanonis was changed in the reprints to T. 

 Hoodensis. 



Dr. Boulenger reviewed the subject in 1891, and concluded 

 that Craniopeltis bivitta Peters differed from Leiocephalus 

 Grayii Bell ; that Tropidurus lemniscatus Cope is a synonym of 

 Craniopeltis bivittata Peters ; that T. habelii and T. abingdonii 



