236 IGUANID^. 



occipital shield and the base of the tail ; eight to ten dorsal scales 

 corresjjond to the length of the shielded part of the head ; lateral 

 scales smaller than, but graduating into, the dorsals, keeled and 

 directed obliquely upwards ; thirt}--six scales round the middle of 

 the body. The adpressed hind limb reaches the anterior border 

 of the orbit or the nostril ; tibia longer than the shielded part 

 of the head ; the distance between the base of the fifth toe and 

 the extremity of the fourth equals the distance between the ann 

 and the nostril or the tip of the snout. Thirteen to fifteen femoral 

 pores. Caudal scales nearly as large as dorsals. Male with enlarged 

 postanal scales. Brownish or greenish above, strongly metallic ; a 

 golden dorso-lateral band; a blackish spot at axilla ; hinder side of 

 thighs with a transverse and several vertical blackish bars ; lower 

 surfaces yellowish white, throat sometimes brownish ; male with- 

 out distinctive ventral markings. 



niillim. millim. 



Total length 157 Fore limb 29 



Head 16 Hind limb 52 



Width of head 11-5 Tail 95 



Body 46 



Guatemala and South Mexico. 



«-/". d" , $ , & bgi'. Yucatan. 



21. Sceloporus variabilis. 



Tropidolepis variabilis, Gray, Cat. p. 209. 

 Sceloporus variabilis, Wiegm. Herp. Mex. p. .51 ; Bocnurt, Mis^. Sc. 



Me.v., Rept. p. 200, pi. xviii. bis, fig. 1, and xix. fig. 2 ; Co;je, Proc. 



Am. Philos. Soc. xxii. 1885, p. 394. 

 Tropidolepis variabilis, Dum. S)- Bihr. iv. p. 308. 



Head-shields keeled or striated ; two canthal scales ; a series of 

 four or five large transverse supraoculars ; occipital as long as broad ; 

 parietals very small ; anterior border of ear with three or four 

 slightly enlarged pointed scales. Dorsal scales much larger than 

 ventrals, strongly keeled, sharply pointed, foi'ming twelve to fifteen 

 parallel longitudinal series ; fifty-six to seventy-eight scales between 

 the occipital shield and the base of the tail ; twelve to fifteen scales 

 correspond to the length of the shielded part of the head ; lateral 

 scales much smaller than dorsals, keeled, directed obliqvaely upwards : 

 fifty-six to seventy-eight scales round the middle of the body. The 

 adpressed hind limb reaches the eye, or between the latter and the 

 ear ; tibia usually a little longer than the shielded part of the head ; 

 the distance between the base of the fifth toe and the extremity of the 

 fourth usually equals the distance between the arm and the nostril. 

 Eleven to thirteen femoral pores. Caudal scales as large as or a 

 little larger than dorsals. Male with enlarged postanal scales. 

 Olive or brownish above, sides darker ; a more or less distinct 

 yellowish dorso-lateral band ; frequently a series of transverse 

 blackish spots along each side of the back ; a blackish spot, light- 

 edged in front, above axilla ; lower surfaces yellowish or dirty 



