G12 REPORT OF NATIONAL MUSEUM, 1898. 



He also adds the following remarks: 



Of all our North American Cuemidopbori this seems to be the most distinct species, 

 Cnemidophorus ( Vcrtkaria) luipenjthriis not even excepted. As will be seen from im 

 enumeration of the characters by which it differs from them all, viz: The peculiar 

 relations of the nasals and anterior labials, the arrangement of the preanals, the 

 low number of femoral pores, twelve to thirteen, brachials in three subequal rows, 

 femorals in only four to five rows. Of these the first-mentioned character seems 

 even to be unique in the genus, as I have seen no mention of it in the descriptions 

 of extralimital species, and after a careful examination of about three hundred 

 specimens of the various North American forms, I can find no approach to the con- 

 dition which is 80 characteristic of the present species, in all five specimens of 

 which it is equally well pronounced. The low number of femoral pores is also well 

 worth noting, inasmuch as it entirely destroys the usefulness of one of the sections 

 of Boulenger's key to the species (Cat. Liz. Brit. Mus., II, pp. 360 and 361), relied upon 

 to separate the South American species, C. occUifer and niultiUneatus, from the other 

 species with eight longitudinal rows of ventral plates and the nostrils ojiening in 

 the nasal. The fusion of the two posterior preanals into one wide transversal plate 

 seems to be another good character. It is true that this state of affairs is occasion- 

 ally seen in specimens of C. sexUneatus or its numerous subspecies, but the occur- 

 rence is rare, hardly reaching 2 per cent in the enormous series examined by me, 

 while in the Cerros Island species it is normal, since found equally well represented 

 in all live specimens. 



LACERTID^. 



Lacertiens CuviER, part, Regue Anim., II, 1817, p. 22. 



Lacerthridw Gkay, Ann. Phil. (2), X, 1825, p. 200 ; Phil. Mag. (2), II, 1827, p. 55. 



Trachydromoidea, Lacertoidea Fitzinger, part, Neue Classif. Kept., 1826, pp. 19, 22, 



Autarchoulossw pleurodontes Waglek, part, Syst. Amph., 1830, p. 154. 



Lacerta; WiEGMANN, part, Herpt. Mex., 1834, p. 9. 



Lacertiens coelodontes Dumeril and Bibkon, Erp. Gen., V, 1839, pp. 16, 153. 



Lacertinidw, Zonaridw Gray, part. Cat. Liz., 1845, pp. 26, 45. 



Holaspidoi Gray, Proc. Zool. Soc, 1863, p. 152. 



Lacertidw Cope, part, Proc. Acad. Nat. Sci. Phila., 1864, p. 237. 



Lacertidw Boulenger, Ann. and Mag. Nat. Hist. (5), XIV, 1884, p. 120. 



Tongue flat, elongate, bifid in front and behind, covered with rhom- 

 boidal scale like papilhi^. or overlapping plic«, converging forward. 

 Dentition strictly pleurodont, the teeth hollow at the base; lateral teeth 

 bicuspid or tricuspid; pterygoids frequently toothed. Premaxillary 

 bone single; nasal and frontal double; parietal single; postorbital and 

 postfrontotemporal arches complete; interorbital septum and colu- 

 mella cranii well developed; palatines and pterygoids separated on the 

 median line. Skull with bony dermal plates, roofing over the supra- 

 temporal fossai. Limbs well developed, pentadactyle. Clavicle dilated 

 and perforated proximally; interclavicle cruciform. Tail long, fragile. 

 Pupil round; eyelids well developed. Ear opening distinct; femoral 

 pores usually present. 



Head with symmetrical shields; those on the u))per surface are 

 (normally) a frontonasal, a pair of prefrontals, a frontal, two to four 

 supraoculars, a pair of frontoparietals, a pair of parietals, and inter- 

 parietal, and an occipital. The latter shield is absent in many species, 

 and so are the frontoparietals in the genus Mohisjjis. Dorsal scales 



