1. CHAM-SLEON. 441 



Tubercles of the gular crest covered willi 



scales or granules 2]. tceniobroncJms, p. 458. 



2. Gular crest formed of long compressed lobes. 



a. Gular lobes thin, narrow, 

 pointed, destitute of scales 

 or granules 20. fjutturaUs, p. 457. 



h. Gular lobes scaly. 



Gular lobes all longer than broad ; tail 



not longer than head and bodj' 22. immilus, p. 458. 



Anterior gular lobes (in the adult) at 

 least as broad as long ; tail consider- 

 ably shorter tlian liead and body .... 23. ventralis, p. 459. 



Anterior gular lobes at least as broad as 

 long ; tail considerably longer than 

 head and body 24. damaranus, p. 460. 



B. Parietal crest bifurcating in front 

 and joining the supraciliaries ; 

 lepidosis uniform 25. tirjris,]}. 401. 



IV. Neither gular nor ventral crest. 



A. Snout not ending in a single, more or less flexible, compressed 

 appendage. 



1. . No fin-like dorsal crest. 



a. No trace whatever of occipital dermal lobes. 



a. Body uniformly granular, or with only a few very 

 slightly enlarged tubercles on each side. 



* No rostral process. 



Parietal crest very feebly marked; no 



dorsal crest 26. affiais, p. 461. 



Parietal crest strong ; a series of large 



bony txibercles, covered with scales, 



along the back 27. namaquensis, p. 462. 



** Snout of male armed. 



Two compressed rostral processes ; no 



parietal crest 27. hijidus, p. 463. 



Two compressed rostral processes ; parie- 

 tal crest distinct, though feebly marked 29. ?mnor, p. 464. 



Bostral process simple and flattened at 



the base, bifid at the end 30. furcifer^ p. 464. 



