27. iRonoaROs. Ito 



male ; lower surfaces yellowish or greenish white, throat and chest 

 frequently spotted with black ; the male's throat usually black. 



millira. milliin. 



Total length 250 Fore limb 4-i 



Head 20 Hind limb 72 



Width of head IG Tail 160 



Body 70 



Galapagos Islands. 



a, b, c-ff. (^ ,2,&yg. Chatham and Charles C. Darwin, Esq. [P.]. 



Islands. (Types.) 



h. cj*. Albemarle Island. Commander Cookson [P.]. 



i. Hgr. c?. Abingdon Island. Commander Cookson [P.]. 



2. Tropidurus pacificus. 



Tropidurus (Craniopeltis) pacificus, Steindaclm, Festschr. zool.-hot. 

 Ges. Wien, 1876, p. 313, pi. ii. tigs. 2, 3. 



Distinguished from 1\ gmi/i by the much smaller and less strongly 

 keeled dorsal scales ; they little exceed the ventrals in size and are 

 never mucronate ; ninety-one to ninety-live scales round the middle 

 of the body. Dark olive above, with small black and greenish spots ; 

 antehumcral fold black ; lower surfaces greenish or bluish-grey, 

 throat and chest spotted with black. 



Size and proportions as in the preceding, 



Galapagos Islands. 



a,b. (S . Abingdon Island. Commander Cookson [P.]. 



3. Tropidurus occipitalis. 



Lsemopristus occipitalis, Peters, Mon. Berl, Ac. 1871, p. 645, 



Scales on the snout keeled ; seven or eight broad supraoculars ; 

 occipital very large, twice as broad as long. A strong transverse 

 gular fold, with denticulated edge, in front of the autehumeral fold. 

 A dorsal crest of very pointed scales, extending on the tail. Dorsal 

 scales keeled, larger than the smooth ventrals ; lateral scales 

 smallest, keeled. Grey-brown above, with four irregular rhom- 

 boidal transverse spots, the first on the middle of the nape, the 

 second between the shoulders, the two others on the anterior part 

 of the back ; on each side of the back a yellowish-green metallic 

 longitudinal band ; antehumeral fold black ; lower surfaces yellowish. 



Tern. 



4. Tropidurus bocourtii. 



Aneuporus occipitalis, Bocoia-t, Miss. Sc. Me.v., JRept. p. 215, pi. xviii. 



Craniopeltis occipitalis. Cope, Jourii. Ac. Philad. (2) viii. 1876, 

 p. 173. 



Upper head- scales smooth ; a series of four or five transverse 



