On the Galapagos Lizards of the Genus Tropidurus. 501 



drooping, comparatively large ; tongue, ocelli, and maxillary 

 palpi invisible ; forehead with a projecting fringe of hairy 

 scales ; antenna? broken ; hind tibiae with a broad expanding 

 tuft of hairs in the middle. 



Type Isopteryx discoloralis, Wlk. xxxiv. p. 1315. 



[To be continued.] 



LVIII. — On the Galapagos Lizards of the Genus Tropidurus. 

 By G. A. Boulengeu. 



I HAVE lately reexamined the specimens of Tropidurus 

 brought home by Darwin and Commander Cookson, with the 

 view of testing the value of the supposed new species from 

 the Galapagos Islands recently described by Cope * and by 

 Baur j". The specimens known from the Galapagos Islands 

 were referred by Steindachner and myself to two species, T. 

 Grayi, Bell, and T. pacificus, Stdr., the form with two light 

 dorsal stripes described by Peters in 1871, from Chatham 

 Island, as Graniopeltis bivittata being regarded as a variety 

 of T. Grayi. It is this very form which has been redescribed, 

 from the same island, by Cope under the name of Tropi- 

 durus lemntscatus, sp. n., without any reference whatever to 

 Peters's description. What is almost worse is Baur's bold 

 statement, " Ueber Tropidurus ( Graniopeltis) livittatus (sic) , 

 Peters, dessen Fundort unbekannt istj, kann ich kein Urteil 

 abgeben." Is it too much to expect from herpetologists 

 in America that they will look up the literature, and 

 avoid quoting, as if seen by them, works to which they 

 have not referred, as is evidently the case with Dr. Baur? 

 I should also like to know where the latter gentleman 

 has found T. pacificus quoted by me from Albemarle. 

 I do not believe in most of the characters set forward 

 by Baur to distinguish different species in the different 

 islands ; his statements are to a great extent contradicted by 

 the typical specimens themselves, as when he says that the 

 striped form, from Chatham Island, has 55-61 scales round 

 the middle of the body, and that the specimens with 65 scales 



* Proc. U. S. Nat. Mus. xii. p. 145 (1889). 



t Biol. Centralbl. x. p. 475 (1890). 



\ Peters states in his original description, " Das einzige mir vorlie- 

 gende Exemplar .... stammt von der Galapagosinsel Chatham " (MB. 

 Berl. Ac. 1871, p. 645.) 



Ann. & Mag. N. Hist. Ser. 6. Vol vii. 34 



