HERPETOLOGY OF PORTO RICO. 



621 



Dimensions. 



The largest specimen in our museum ( No. 29374) measures as follows: 



mm. 



Total length (tail reproduced) 260 



Snout to vent 95 



Tail ( reproduced ) .• 165 



Snout to ear 23 



Width of head 16 



Fore leg from axilla 32 



Hind leg from groin 62 



Outer toe without claw 8. 5 



Inner toe without claw 4.5 



The specimen described by Boulenger measured from snout to vent 

 122 mm., and was consequently a much larger animal. It seems 

 doubtful, however, if A. alboguttata reaches the same extreme size 

 as A. exul. 



Habitat. — This form, as far as known, is restricted to the small 

 island of Mona. 



List of specimens of Ameiva alboguttata. 



Genus CELESTUS" Gray. 



1838. Celestus Gray, Ann. Nat. Hist, II, Dec, 1838, p. 288 



(type C. striatus). 

 1845. Oneyda Gray, Cat. Liz. Brit. Mus., p. 119 (type 0. 



owenii). 



1860. Siderolamprus Cope, Proc. Phila. Acad., 1860, p. 368 



(type S. enneagrammus) . 



1861. Panolopus Cope, Proc. Phila. Acad., 1861, p. 494 (type 



P. costatus). 



In spite of the great external resemblance to the 

 skinks as exemplified by the Mabuya, described above, 

 the lizards forming this genus belong to a totally dif- 

 ferent family, the Anguidss, of which our "glass 

 snake'' is perhaps the best known example. They are 

 with equal propriety called "slippery backs." being 

 smooth and glossy, and this name might appropriately 



« According to Agassiz Celestus is a name of some person. It is quite as likely, 

 however, that it is a nonsense word coined by Gray. 



Fig. 73.— Shields 

 on top of head 

 of Celestus. /, 

 frontal ;/», fron- 

 tonasal ; ip, in- 

 terparietal; oc, 

 occipital; p, pa- 

 rietal; pf, pre- 

 frontal; r, ros- 

 tral; m, supra- 

 nasal; so, supra- 

 oculars. 



