330 



REPORT OF NATIONAL MUSEUM, 1898. 



Anterior border of meiitus auditoriiis paler. A large blue i)atch on 

 each side of the belly extending from axilla to groin, and not meeting 

 its fellow on the middle line. Throat yellowish, faintly reticulated 

 with blue. Posterior face of femur with a light band, bordered by 

 dark above and below. A black spot on side over scapula. 



3f€asurenients.— Total length, 180 mm,; length to vent, 59 mm.; to 

 collar, 15 mm.; of anterior leg, 27 mm.; of posterior leg, 44 mm.; of 

 posterior foot, 21 mm. 



This species is about the size of the Sceloporus consobrinus. It seems 

 to be rare, as Mr. Taylor took only one specimen. 



Lysopiychus lateralis Cope. 



SCELOPORUS Wiegmann. 



Sceloporus Wiegmann, Isis, 1828, g. 369; Herpt. Mex., 1834, p. 48.— Fitzixger, 



Kept. Syat., 1843, p. 75.— Bocourt, Miss. Sc. Mex., Rept., 1874, p. 167.— Bou- 



LENGEH, Cat. Liz. Brit. Mus., II, 1885, p. 216. 

 Tropidolejns CuviER, Reg. Aaini., 2tl ed., IT, 1829, p. 38.— Dum15:kil and Bibron, 



IV, 1837, p. 294.— FiTZiNGEU, Rept. Syst., 1843, p. 76.— Gray, Cat. Liz., 1845, 



p. 208. 

 Tropidurus Wagler, part, Syst. Aniph., 1830, p. 146. 



No gular constriction ; one lateral fold on the neck. Femoral jjores. 

 Scales all imbricated; rhomboidal, rather verticillate on tail; above 

 generally carinated. Head above with regular plates. Superciliary 

 plates imbricate toward a median keystone scale; labials not imbricate. 

 Ears distinct. Nostrils superior within thecanthusrostralis. Tongue 

 fleshy; arrow-shaped; rounded at tip; broadly adherent, except at end, 

 where are two triangular disks beneath. No palatine teeth. Cheek 

 teeth compressed, the summit 3-lobed. Tail rounded, very brittle. 



The genus Sceloporus consists of terrestrial, and therefore depressed 

 thoracopleurous Iguanida^, with flat scales and distinct parietal scuta, 

 and femoral pores, without preanal pores and gular, dermal fold, or 

 collar. Its especial habitat is Mexico and Central America, the south- 

 western parts of the United States and California. A single species 

 ranges over the entire eastern district of the Neartic Realm. Outside 

 of the districts named it does not occur. 



Osteology. — As a basis for an examination of the osteology of this 

 genus I have before me two skeletons of the 8. undtilatus und one of the 

 S. spinosiis, from the U. S. National Museum. 



The premaxillary bone has a long superior spine, and is truncate on 

 the palatal face, and has the button-like process. The nostrils are par- 

 tially vertical, so that the nasals are a little shortened in front. Tbe 

 latter are rather large and are distinct. The frontal is simple and nar- 



