THE RErXILES OF THE GALAPAGOS ISLANDS. 85 



of G. ocellatus, the scales uiuler the fourth toe arc smaller 

 toAvard the base ; in our species they are about equal in 

 size. 



Bab. Wreck Bay, Chatham Islaud. 

 Orophis biserialis. 



Herjietodryas biserialis Gthr., 1860, Pr. Zool. Soc. 



Lond., 97. 

 Dromicus ChamissonisV^i., 1869, M. B. Berl. Akad., 



719. 

 D. CJiamissonis var. biserialis Gthr., 1870, Zool. 



Eec.,vi, 1869, 115. 

 D. C/iamissonisvnr. dorsalis and var. Habelii Steind., 



1876, Schl. u. Eid. der Galap.-Inseln, p. 6, pi. 1. 

 Opheomor'plius Chamissonis Cope, 1889, Pr. U. S. 



Mus., 147. 



There is a single specimen of this suake in the collection 

 from Hood Island. It is intermediate between Giiuther's 

 species biserialis and Steindachner's variety Habelii. Struc- 

 turally it agrees with the type described by Giinther, but 

 it has no s[)ots on the back. The dorsal band is coutinuous, 

 though faiuter and indistinctly margined behind the middle 

 of the length. The type from which the species was origi- 

 nally described Avas said to be from Charles Island. The 

 present specimen from another locality possesses the 

 squamation of one of the so-called varieties and the color- 

 ation of the other. This seems to me to indicate the exist- 

 ence of but one variety, of which the spotted foinis and 

 those with three postorbitals are individual variations. 

 There is nothing in the published evidence to show that 

 the striped form, the spotted form, that with two postor- 

 bitals, and that with three do not occur amongst the indi- 

 viduals of any of the localities inhabited by this snake. 



