20 IGUANIDE. 
¥# Dorsal scales granular, smooth, very small. 
Head very short........-.. 2 eee eens eeee 106. obtusirostris, 
p. 95 
2, Tibia at least as long as the distance between the end of 
the snout and the ear. 
a. Dorsal scales keeled. 
a. The third phalanx of the fourth toe distinctly wider 
than the basal. 
* Ventral scales smooth or indistinctly keeled. 
Supraorbital semicircles separated by one row 
of scales of nearly equal size......-..... 72. cymbops, p. 73. 
** Ventral scales keeled. 
+ Scales of the supraorbital semicircles in contact 
medially or separated by one row of very 
small scales. 
Scales on the forehead not keeled; tail with [p. 77. 
a dorsal series of enlarged scales ........ 79. palpebrosus, 
Scales on the forehead keeled ............ 95. lemurmus, p. 86. 
+t Scales of the supraorbital semicircles separated 
by one to four series of scales. 
+ Occipital as large as or larger than the ear- 
opening. 
Dorsal scales much larger than laterals, smaller 
than ventrals; supraorbital semicircles 
separated from each other by one or two 
series of scales, and from the occipital by 
two or three series; 13 or 14 lamelle under 
phalanges IT. and III. of the fourth toe .. 84. eupreus, p. 80. 
Dorsal scales very small; supraorbital semi- 
circles separated from each other by two to 
four series of scales, and from the occipital 
by three to five series; 13 or 14 lamelle.. 93. godmani, p. 85. 
Scales of the three or four median dorsal [p. 87. 
series nearly as large as the ventrals .... 96. trachyderma, 
Dorsal scales very small; 17 or 18 lamelle 98. biporcatus, p. 88. 
tf Occipital smaller than the ear-opening. 
Occipital minute or wanting.............. 91. pecilopus, p. 84. 
Occipital enlarged, little smaller than the ear- 
OPCMING ssy-sncce es aad See 8 ee aes 97. stigmosus, p. 87. 
8. The three basal phalanges of the fourth toe of 
nearly equal width. 
* Head nearly twice as long as broad. 
Eleven longitudinal series of large dorsal scales 69. bitectus, p. 71. 
