100 



h. Nuchal and dorsal crests separated. 



••■■ Ventral scales smooth lo. G. megalcpis^ p. 107. 



■•■■* Ventral scales keeled 11. 6". dilophus^ p. 108. 



II. Dorsal scales equal. 



a. Ventral scales smooth 12. 6". grandis^ p. 109. 



b. Ventral scales keeled. 



1. Below the ear some large, flat scales. 



t Crest continuous 13. G. hinotatus^ 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 lA,. G. nigj-igiilaj-is^ p. III. 



b. Posterior gular scales keeled ; dorsal 

 crest higher than nuchal; tympanum 



larger than eye-opening i'^. G, godeffroyl^ p. 112. 



ttt Crests separated 16. C papnensls^ 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. modes/us^ p. 113. 

 /'. Nuchal and dorsal crests continuous, 



latter lower; gular scales small, keeled; 



dorsal scales strongly keeled 18. C. 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". aiiritus^ p. 115. 



d, Nuchal and dorsal crests subcontinuous, 

 notched, latter lower ; gular and dorsal 



scales small, almost smooth 20. G. bruy?}i^ p. 115. 



I. Gonyocephalus doriae Peters. 



Gonyocephalus Doriae^ Peters, Mon. Berl. Ac. 187 1, p. 570; Ann. Mus. Civ. 



Genova 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. 



