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. 



Lygosof/ia Gray, Zobl. Journ., iii, p. 228, 1828. 



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



LYGOSOMA ARUNDELI Garman. 



Lygosoma at U7tdc/n GxKUX'S, 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.' The species is of doubtful validity but in the absence 



MEASUREMENTS OF Lygosoma arundeli. 



Cat. No. Stan. Univ. Mus. 



Head and body, length. 

 Tail, length...' 



4969 



Snout to ear ^ 



Snout !« 



Width of head^ 



Fore limb^ i 



Hind limb^ | 



Scales in circumference 



of body I 



Sirbdigital lamellse I 



50 

 74 

 % 

 24 

 12 

 16 

 31 

 44 



28 

 63 



4961 4960 



4962 



48 

 74 

 fo 

 25 

 II 



17 

 28 



43 



30 

 60 



50 

 80 

 % 

 24 

 12 



17 

 28 

 42 



26 

 60 



45 

 69 

 % 



23 

 II 

 16 

 28 

 40 



28 

 52 



47 

 66 



% 

 22 



II 



15 

 28 

 40 



30 

 53 



No. 4969. Right prefrontal coalesced with frontal. 



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



No. 4962. Frontal coalesced vith prefontals. 



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



^ Stejneger (L. ), Hawaiian Land Reptiles. Proc. U. S. Nat. Mus., vol. xxi, 

 . 807, 1899. 

 ^Percentages of length of head and body. 

 Pk.c. Wash. Acad. Sci.,Jul\, 1903. 



