REPTILES 



97 



Females with a trace of the gular-sac of the male ; no enlarged 

 vertebral scales and tail usually without the median dorsal series en- 

 larged. Coloration similar to that of the male but somewhat duller, 

 lacking the orange coloration of the gular-sac. 



Eleven specimens are in the collection from Cocos Island. 



Genus Lygosoma Gray. 



Lygosoma GRAY, Zool. Journ., in, p. 228, 1828. 



Range. Tropicopolitan. Clipperton Island (one peculiar species) . 



LYGOSOMA ARUNDELI Garman. 



Lygosoma at undelii CARMAN, Proc. N. Eng. Zool. Club, I, p. 61, 1899. 



Range. Clipperton Island. Occurs abundantly on Clipperton 

 Rock, which forms a small projection near the center of the coral 

 atoll. 



Fifteen specimens are in the collection. These agree minutely in 

 squamation with the descriptions of Polynesian specimens of L,. cya- 

 nurum (Lesson) but differ somewhat in coloration. The light stripes 

 of this latter species are represented by a single median light stripe. 

 In the suppression of the lateral light stripes the species approaches 

 some specimens of L. cyanurum from the Hawaiian Islands described 

 by Stejneger. 1 The species is of doubtful validity but in the absence 



MEASUREMENTS OF Lygosoma arundeli. 



No. 4969. Right prefrontal coalesced with frontal. 

 Nos. 4955, 4959, 4961. Frontal touching fronto-nasal. 

 No. 4962. Frontal coalesced with prefontals. 

 Nos. 4960, 4964, 4968. Frontal not touching fronto-nasal. 



1 Stejneger (L. ), Hawaiian Land Repliles. 

 p. 807, 1899. 



2 Percentages of length of head and body. 

 Pr>c. Wash. Acad. Sci., Julv, 1903. 



Proc. U. S. Nat. Mus., vol. xxi 



