9. BASILIScUs. 109 
accessory anterior portion ; the former commences above a point a 
little in front of the anterior margin of the ear-opening, the latter 
rises abruptly from a point on a line with the posterior border of 
the orbit. Six or seven labials to below the centre of the eye. The 
three anterior chin-shields in contact with the infralabials. Dorsal 
crest much developed, a little higher than the body, supported by 
bony rays, covered with large thin scales. Caudal crest like the 
dorsal. Ventral scales perfectly smooth. Colour everywhere green, 
becoming blue on the different crests; a row of distant round 
yellow spots from the axilla to the groin, and, usually, a similar row 
along the upperside of the back; usually three vertical pale- 
bordered black spots on the dorsal crest; crested part of the tail 
green, the remainder yellowish, with brown rings. 
Total length .......... 655 millim. 
Head (to ear) ........ 45 ,, 
Fore limb ............ \o1/ aare 
Hind limb............ TTD ys 
ABA! Bo te Wea hee Bees 478 
Costa Rica. 
3. Basiliscus vittatus. 
Corythzeolus vittatus, Gray, Cat. p. 198. 
Basiliscus vittatus, Wiegm. Isis, 1828, p. 873; Dum. § Bibr, iv. 
p. 187; Sumichr. Arch, Sc. Phys. Nat. xix. 1864, p. 56; Bocourt, 
Miss. Se. Mex., Rept. p. 129, pl. xvii. fig.3; Cope, Jowrn. Ae. 
Philad. (2) viii. 1876, p. 125; Giinth. Biol. C.-Amer., Rept. p. 55, 
tab. 28. 
Corythxolus vittatus, Kaup, Isis, 1829, p.1147 ; Wiegm. Herp. Mex. 
. 40, pl. v. 
(Etter pkus vittatus, Wagl. Syst. Amph. p. 148. 
Cristasaura mitrella, Gray, Ann. §& Mag. N. H. (2) x. 1852, p. 489. 
Basiliscus americanus, Salvin, Proc. Zool. Soc. 1860, p. 458. 
Draconura bivittata, Hallow. Proc. Ac. Philad. 1860, p. 482. 
Paraloma bivittata, Cope, Proc. Ac. Philad, 1862, p. 181. 
Basiliscus (Cristasaura) nuchalis, Cope, 4. c. 
Head-crest subtriangular, rising from a line connecting the supe- 
rior borders of the ear-openings, and extending as a strong keel or 
ridge to between the posterior borders of the orbits. Six or seven 
labials to below the centre of the eye. Usually only the first or the 
first two chin-shields in contact with the infralabials. Dorsal crest 
low, supported by bony rays. The lateral fringe of the toes less 
developed than in B. americanus. Caudal crest reduced to a serrated 
ridge. Ventral scales keeled, less distinctly in the adult males. 
Olive or brownish above, usually with more or less distinct black 
cross bars on the back, and a reddish longitudinal band on each 
side, commencing from the orbit; a reddish or whitish band 
from the loreal region to the angle of the jaws, or to the base 
of the fore limb. 
