Vol. II, Pt. I] VAN DENB URGH—SLEVIN—GALAPAGOAN LIZARDS 135 



rests only upon external characters. The internal organs have 

 not been examined. 



The Galapagos lizards of the genus Tropidnnis have been 

 much better known than any of the other reptiles of the archi- 

 pelago. This is due chiefly to the studies of the late Dr. 

 George Baur, from whose writings we shall quote. 



Previous Collections and Studies 



The presence of lizards in these islands probably was 

 recorded first by Amasa Delano in A Narrative of Voyages 

 and Travels published in Boston in 1817. He mentioned the 

 land "guana," the sea "guana," and lizards. 



The largest kind of lizards found here resembles the land guana in 

 everything except size ; they being only a little more than half the length. 

 Their color and coarse appearance are the same with exception of a 

 bright vermilion red throat ; which makes it appear as if bloody. There 

 are to be found there also two smaller kinds of lizards. The smallest is 

 not much larger than a man's finger. The size of the other kind is be- 

 tween the two. There is no particular difference in the shape of the three 

 kinds, but the color of the two latter is gray. 



Charles Darwin, in 1835, during the voyage of the 

 "Beagle," collected the specimens upon which Thomas Bell, 

 in 1843, based the first scientific description of a Galapagos 

 Tropidurus. These specimens "were taken in Chatham Island 

 and in Charles Island." They were named by Bell Leio- 

 cephalus Grayii. 



In 1851, Dumeril recorded, under the name Holotropis 

 Grayii, some Galapagos specimens without definite locality 

 labels, which were collected during the visit of the "Venus." 



Dr. Kinberg, during the voyage of the "Eugenie," secured 

 lizards on Chatham, Charles and Albemarle islands. Dr. 

 Peters, in 1871, described the Chatham specimen as a new 

 species, Craniopeltis bivittata; and recorded the Charles and 

 Albemarle examples under the name Craniopeltis Grayii. 



In 1872, Dr. Steindachner visited the Galapagos in connec- 

 tion with Louis Agassiz and the "Hassler" expedition. He ob- 

 served these lizards on Albemarle, Indefatigable, James, and 

 Jervis islands. Four j^ears later Dr. Steindachner published 

 an account of the lizards and snakes of the Galapagos islands. 

 Dr. Habel, in 1868, had collected some lizards on "Indefati- 

 gable [ ?] and Bindloe" islands. These were described by 

 Dr. Steindachner, as Tropidurus (Craniopeltis) paciUcus and 



