8O HELLER 



This species is generally distributed over Hood and Gardner, but as 

 on the other islands of the archipelago they occur much more abun- 

 dantly near the coast. 



Food consists of insects, seed capsules and berries. Stomachs ex- 

 amined contained grasshoppers, beetles, caterpillars, seeds and berries. 



TROPIDURUS BIVITTATUS (Peters). 



Leiocephalus grayii BELL, Zool. Beagle Kept., p. 24, 1843 (P art ). GRAY, 



Cat., p. 218, 1844 (part). GUNTHER, Proc. Zool. Soc., p. 67, 1877 



(part). 



Crainopeltis bivittata PETERS, Mon. Berl. Ac., p. 645, 1871. 

 Tropidurus {Crainopeltis) grayii STEINDACHNER, Festschr. Zool.-Bot. Ges., 



Wien, p. 310, 1876 (part). 



Tropidurus grayii BOUL. , Cat., II, p. 172, 1889 (part). 

 Tropidurus lemniscatus COPE, Proc. U. S. Nat. Mus., xn, p. 145, 1889. 



BAUR, Biol., Centralbl., x, p. 475, 1890. 

 Tropidurus bivittatus BOUL., Ann. N. H. (6), vn, p. 501, 1891. BAUR, 



Festschr. Leuckart, p. 272, 1892. 



Range. Galapagos Archipelago ; Chatham Island (Darwin, Kin- 

 berg, Albatross 1888, Baur, Hopkins Stanford Expedition.). 



Specific Characters. Two oblique folds on side of neck ; no 

 folds between ear opening and anterior oblique fold; sides of neck 

 scaled. Male with two longitudinal light stripes above. Scales in 

 circumference of body 55 to 65. Small, length of head and body in 

 male 66 to 85 mm., female 57 to 61 mm. 



Plates on top of head small and numerous ; about equal in size. 

 The frontal and azygos plates between prefrontals and frontonasals 

 equal in size to prefrontals. Prefrontals transversely divided forming 

 eight ; frontonasals four. Crest of male about one half internasal dis- 

 tance in height, highest on tail. 



Coloration in life of adult male, Cat. No. 4951, Stan. Univ. Mus. ; 

 above olive-brown, top of head darker brown ; a light stripe two 

 and one half scales wide beginning behind eye, running slightly up- 

 ward above ear and along sides to base of tail ; a narrow stripe of the 

 same color beginning at axilla and extending along sides to base of 

 thigh. Belly yellowish, red-tinged ; breast, tail and hind limbs below 

 soiled whitish or grayish ; throat and lower jaw same ; sides of head 

 grayish ; sides of body below lateral stripe barred yellow and brick 

 red ; a black antehumeral spot. Limbs above spotted with brown and 

 gray; tail posteriorly light brown. 



The fourteen adult males in the collection are all dusky-spotted on 

 breast, throat, mandible and limbs. The immature males are whitish 

 below without dusky spots. One large male is wholly buff below. 



Length of head and body 66 to 85 mm. 



