9. BASILISCU3. 109 



accessory anterior portion ; the former commences above a point a 

 little iu front of the anterior marjjjin 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 iufralabials. 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 87 „ 



Hind limb 175 ,, 



Tail 478 „ 



Costa Rica. 



3. Basiliscus vittatus. 



Coryth;i3olus vittatus, Gray^ Cat. p. 193. 

 Basiliscus vittatus, Wiegm. Isis, 182S, p. 873 ; Dum. ^- Bibr. iv. 



p. 187 ; Sumichr. Arch. Sc. Pkt/s. Nat. xix. 1864, p. 56 ; Bocourt, 



Miss. Sc. Mex., Kept. p. 129, pi. xvii. fig. 3 ; Cope, Jonrn. Ac. 



Fhilad. (2) viii. 1876, p. 125; Gunth. Biol. C.-Amer., Rept. p. 55, 



tab. 28. 

 Corythfeolus vittatus, Kaup, Isis, 1829, p. 1147 ; Wiegm. Ilerp. Me.v. 



p. 40, pi. V. 

 ffidicoryphus vittatus, Wagl. Si/st. AmpJi. p. 148. 

 Cristasaura mitrella. Gray, Ann. ^- Mag. N. H. (2) x. 1852, p. 439. 

 Basiliscus americanus, Salvin, Froc. Zool. Soc. 1860, p. 453. 

 Draconura bivittata, IIullow. Proc. Ac. Philad. 1860, p. 482. 

 Paraluma bivittata, Cope, Proc. Ac, Phi/ad. 1862, p. 181. 

 Basiliscus (Cristasaura) uuchalis, Co2)e, I. c. 



Head-crest sub triangular, 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 sei'rated 

 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 tlie loreal region to the angle of the jaws, or to the base 

 of the fore limb. 



