236 IGUANIDE. 
occipital shield and the base of the tail; eight to ten dorsal scales 
correspond to the length of the shielded part of the head ; lateral 
scales smaller than, but gradvating into, the dorsals, keeled and 
directed obliquely upwards ; thirty-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 arm 
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. 
millim. millim. 
Total length ...... 157 Fore limb ........ 29 
Head xy a é seus Haass 16 Hind limb........ 52 
Width of head .... 11-5 PAE fo satae aise aie ae 95 
Body sca cia coun oe 46 
Guatemala and South Mexico. 
a-f. 3, 2, & her. Yucatan. 
21. Sceloporus variabilis. 
Tropidolepis variabilis, Gray, Cat. p. 209. 
Sceloporus variabilis, Weegm. Herp. Mex. p. 51; Bocourt, Miss. Se. 
Mex., Rept. p. 200, pl. xviii. bis, fig. 1, and xix. fig. 2; Cope, Proe. 
Am. Philos, Soc, xxii, 1885, p. 394. 
Tropidolepis variabilis, Dum. & Bibr. iv. p. 808. 
Head-shiclds 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, forming 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 obliquely 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. Candal 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 
