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 Indo-Australia n species. 



A. Supraciliary border strongly raised. 



I. Dorsal crest strong, almost as high as the 



nuchal I. G. doriae, p. 100. 



II. Dorsal crest much lower than the nuchal. 



a. Ventral scales keeled 2. G. kuhli, p. 101. 



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. G. sumatranus, p. 103. 



B. Supraciliary border normally raised. 

 I. Dorsal scales unequal. 



a. Nuchal and dorsal crests continuous. 

 | Ventral scales smooth (or faintly 

 keeled). 



1. Scales at the base of the crest 



keeled 5 ventral scales smooth . . $. G. liogaster^ p. 103. 



2. Scales at the base of the crest 

 smooth; ventral scales smooth or 



faintly keeled 6. G. hcrveyi, 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 7. G. beyschlagi, p. 105. 



tf Ventral scales keeled. 



1. Enlarged dorsal scales irregularly 



distributed 8. G. borneensis, p. 1 06. 



2. Enlarged dorsal scales in a lateral 



longitudinal series 9. G. miotympanum^ p. 106. 



