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



CLIPPERTON ISLAND. 



Clipperton Island is an atoll about three miles long, at one 

 end of which may be seen a large black rock known as Clip- 

 perton Rock. The following species seems to be the only- 

 land reptile known from Clipperton Island. 



1. Emoia arundelii (Carman). 



Lygosoma arundelii Garman, Proc. N. Eng. Zool. Club, I, 1899, p. 61 ; 

 Hell];r, Proc. Wash. Acad. Sci., Vol. V, 1903, p. 97. 



Sixty-five specimens (Nos. 9025-9089) were collected on 

 Clipperton Rock, August 10, 1905. These lizards appear to 

 be more abundant on Clipperton Rock than elsewhere on the 

 island. The following color description was taken from a liv- 

 ing specimen, now number 9054, of the Academy collection : 



Back very dark brown with a fairly distinct grayish stripe 

 running from tip of snout to base of tail, gular region a little 

 darker than belly, which is dull slate; under surface of hind 

 legs yellowish. 



We have not compared these lizards with E. cyanura. 



The scales around the middle of the body were counted in 

 38 specimens and found to be in 28 rows in all. The scales 

 in a row down the middle of the back from the base of the 

 head to a line joining the posterior surface of the thighs vary 

 from 51 to 56; being 51 twice, 52 six times, 53 ten times, 54 

 eight times, 55 eight times, and 56 four times. 



COCOS ISLAND. 



Two species of lizards from this island have been described. 



1. Sphaerodactylus pacificus Stejneger. 



SphcBvodactylus pacificus Stejneger, Proc. Biol. Sci. Wash., Vol. 

 XVI, 1903, p. 3. 



This species was described by Dr. Stejneger from five speci- 

 mens collected in 1902 by Prof. Biolley, naturalist of the Museo 

 Nacional, San Jose, Costa Rica. Although a careful search 

 was made during a week's stay, September 5-12, 1905, by the 

 Academy's Galapagos expedition, no specimens of this gecko 

 were obtained. 



