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 Ind o- A ustralian species. 



A. Supraciliary border strongly raised. 



I. Dorsal crest strong, almost as high as the 



nuchal 1.6". don'ae, p. loo. ^ * "^ "v^-^ * 



II. Dorsal crest much lower than the nuchal. 



a. Ventral scales keeled 2. G. kuhli^ p. loi. -^ ^-AT""*- 



b. Ventral scales smooth. 



1. Nuchal crest beginning at the occiput, .^ o w 

 not higher than the length of the snout. 3. G, chamaeleo?itinus^ p. 102. \ a 



2. Nuchal crest beginning at the inter- 

 orbital region, higher than the length 



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



B. Supraciliary border normally raised. 

 I. Dorsal scales unequal. 



a. Nuchal and dorsal crests continuous. 

 t Ventral scales smooth (or faintly 

 keeled). 



1. Scales at the base of the crest 



keeled; ventral scales smooth . . ^. G. liogaster^ p. 103. 



2. Scales at the base of the crest 



smooth ; ventral scales smooth or u ^ x j ^^ k. 



faintly keeled d. G. herveyi-, p. 104. * ^ ? "^ c 



3. Crest slightly notched on the nape ; 

 enlarged dorsal scales in a longi- 

 tudinal series ; throat and sides of 

 neck vi'ith unequal scales ; ventral 

 scales smooth T. G. heyschlag'i^ p. 105. 



It Ventral scales keeled. 



1. Enlarged dorsal scales irregularly 



distributed 8. 6". borneetisis, p. 106. \ji & ■< >- 



2. Enlarged dorsal scales in a lateral ^ 

 longitudinal series 9. 6". viiotympanum^ p. 106. \ "i « 



vj W. 



