162 IGUANIDE. 
b. Outer parietals at least twice as 
large as inner ............ 7. carinatus, p. 165, 
2. Ventral scales keeled .......... 8. herminieri, p. 166. 
B. Parietal plates transversely divided. 
Upper head-scales smooth or feebly stri- 
ated; a dorso-lateral crest; ventral 
scales strongly keeled .............. 9. aculeatus, p. 167. 
Upper head-scales smooth; ventrals smooth 
or feebly keeled ...............04. 10. tridescens, p. 167. 
Upper head-scales unicarinate; ventrals 
heeled ag casngtage eh Ailes cid ee taare a 11. erythrogaster, p. 168. 
II, Head-scales small, parietals indistinct. 
A. No supraciliary crest. 
1. Upper head-scales not keeled; a 
series of transversely enlarged 
supraoculargs........... 00005 12. formosus, p. 168. 
2. Upper head-scales keeled. 
43 scales round the middle of the body ; 
gular scales as large as dorsals ...... 13. ornatus, p. 168. 
47 scales round the middle of the body ; [p. 169. 
gular scales smaller than dorsals .... 14. trachycephalus, 
61 to 75 scales round the middle of the 
BODY. cited aS Asay d sect aot a auncres aoa wie 15. guentheri, p. 169. 
B. A supraciliary crest. 
Posterior supraciliary scales compressed ; 
temporal scales imbricate .......... 16. tricristatus, p. 170, 
Supraciliary crest ending in a large py- 
ramid-shaped tubercle; temporal scales 
tubercular, cc... ese nce deere es 17. dumeriliz, p. 170. 
1, Liocephalus schreibersii. 
Pristinotus schreibersii, Gravenh. N. Acta Ac. Leop.-Carol. xviii. 
1838, ii. p. 739, pl. liv. figs. 15, 16. 
Steironotus schreibersii, Fitzing. Syst. Rept. p. 70. 
Liocephalus schreibersii, Cope, Proc. Ac. Philad. 1868, p. 123. 
Upper head-scales large, striated; nasal in contact with the 
rostral; supraorbitals in contact; supraoculars seven or eight, 
band-like, separated from the supraorbitals by a series of small 
scales; parietals two pairs on one row, subequal, or outer pair a 
little larger. Sides of neck strongly plicate, covered with very 
small granular scales. Dorsal crest low. Dorsal scales small, not 
mucronate, the keels forming nearly straight longitudinal lines ; 
