100 



b. Nuchal and dorsal crests separated. 



* Ventral scales smooth IO. G. megalepis, p. 107. 



** Ventral scales keeled n. G. dilophus, p. 108. 



II. Dorsal scales equal. 



a. Ventral scales smooth 12. G. grandis, p. 109. 



b. Ventral scales keeled. 



1. Below the ear some large, flat scales. 



t Crest continuous 13. G. binotatus, p. no. 



ft Crest subcontinuous, with a notch 

 above the shoulder. 



a. Gular scales smooth; dorsal crest 

 lower than nuchal; tympanum 

 smaller than eye-opening ; gular 



fold black or grey 14. G. nigrigularis, p. in. 



b. Posterior gular scales keeled ; dorsal 

 crest higher than nuchal; tympanum 



larger than eye-opening 15. G. godeffroyi, p. 112. 



ftt Crests separated 16. G. papuensis, p. 113. 



2. No large scales below the ear. 



a. Nuchal crest low, formed of 4 6 

 widely separated scales; dorsal crest 

 indistinct; gular scales very small, 



granular; dorsal scales small, keeled 17. G. modestus, p. 113. 



b. Nuchal and dorsal crests continuous, 

 latter lower; gular scales small, keeled; 



dorsal scales strongly keeled 18. G. geelvinkianus^ p. 114. 



c. Nuchal and dorsal crests low, sub- 

 continuous ; gular scales small, smooth ; 

 dorsal scales small, keeled; a black 



spot on each side of the head. ... 19. G. auritus, p. 115. 



d. Nuchal and dorsal crests subcontinuous, 

 notched, latter lower ; gular and dorsal 



scales small, almost smooth 20. G. bruyni, p. 115. 



i. Gonyocephalus doriae Peters. 



Gonyocephalus Doriae, Peters, Mon. Berl. Ac. 1871, p. 570; Ann. Mus. Civ. 



Geneva III 1872, p. 28, pi. Ill, fig. I. 

 Gonyocephalus doriae, Boulenger, Cat. Liz. I 1885, p. 284. 



Snout slightly longer than the diameter of the orbit ; canthus 

 rostralis strongly projecting; supraciliary borders strongly raised, 

 forming an angle in its posterior part; tympanum distinct, 

 smaller than the eye-opening. Head-scales small, smooth ; no 

 enlarged scales on the temple; twelve upper and lower labials. 



