99 

 7- Gonyocephalus Kaup. 



(Kaup, Isis p. 590, 1825). 



Body compressed, covered with small uniform or unequal 

 scales. Tympanum distinct. A strong transverse gular fold ; a 

 gular sac in males. A dorsal crest, well-developed in the male. 

 No praeanal or femoral pores. 



Distribution. From India to Papuasia and Polynesia; N. E. 

 Australia. 



Key to the I n do- Australia n species. 



A. Supraciliary border strongly raised. 



I. Dorsal crest strong, almost as high as the 



nuchal l. G. doriae^ p. loo. 



II. Dorsal crest much lower than the nuchal. 



a. Ventral scales keeled 2. G. ktihli^ p. loi. 



b. Ventral scales smooth. 



1. Nuchal crest beginning at the occiput, 



not higher than the length of the snout. 3. G. chamaeleontinus^ p. 102. 



2. Nuchal crest beginning at the inter- 

 orbital region, higher than the length 



of the snout 4. 6^. swnatranus^ p. 103. 



B. Supraciliary border normally raised. 

 I. Dorsal scales unequal. 



a. Nuchal and dorsal crests continuous. 

 I Ventral scales smooth (or faintly 

 keeled). 



1. Scales at the base of the crest 



keeled; ventral scales smooth . . 5. C liogaster^ p. 103. 



2. Scales at the base of the crest 

 smooth; ventral scales smooth or 



faintly keeled d. G. herveyi^ p. 104. 



3. Crest slightly notched on the nape; 

 enlarged dorsal scales in a longi- 

 tudinal series ; throat and sides of 

 neck with unequal scales ; ventral 



scales smooth T. G. beyschlagi^ p. 105. 



j-j- Ventral scales keeled. 



1. Enlarged dorsal scales irregularly 



distributed %. G. borneensts, p. 106. 



2. Enlarged dorsal scales in a lateral 



longitudinal series 9. 6". viiotympa?ium^ p. 106. 



