58 



Male with n 16 praeanal pores in a short angular series. 

 Tail cylindrical, annulate, covered with quadrangular smooth 

 scales, larger beneath; each annulus is composed of 8 u 

 rows of scales above, 3 beneath ; above large conical tubercles 

 in 6 longitudinal series; below the large scales are transver- 

 sely dilated, forming two symmetrical series. Limbs long; digits 

 free, strongly dilated, below with undivided curved lamellae. 



Brown or brownish-grey above, variegated with darker tints, 

 usually with transverse rows of white spots; sometimes a 

 X-shaped dark brown mark on the head ; tail banded with 

 darker and lighter. Lower parts whitish, variegated with grey. 

 Length of head and body 190 mm.; tail 180 mm. 



Nom. indig. Bewak pongo (mal.). 



Habitat: Nias!; Sumatra (Deli!, Indragiri, Langkat!, 

 Bingin Telok, Tandjung Laut, Palembang, Padang, Taluk !) ; 

 Borneo (Bandjermassin, Labuan, Kapuas river, Kuching, Rejang 

 river, Undup, Akar river, Sandakan, Mt. Dulit); Java (Buiten- 

 zorg, Depok, Bantam). Malacca; Burma; Andamans; Nicobars. 



10. Ptychozoon Kuhl. 



(KUHL, in Fitzinger, N. Class. Kept. p. 13, 1826). 



Digits strongly dilated, entirely webbed, with undivided lamel- 

 lae below (fig. 37); all except the inner ones with a compressed 

 curved distal phalanx with retractile claw, beginning a little 

 before the extremity of the dilatation. Limbs and sides of 

 head, body and tail with much developed cutaneous expan- 

 sions, used for concealing purposes. Body covered above with 

 juxtaposed granular scales and tubercles; lower surfaces with 

 small, slightly imbricate scales. The membrane covered above 

 with imbricate square scales, below without scales. Pupil ver- 

 tical. Males with praeanal and femoral pores. 



Distribution. Western part of the Archipelago. 



Key to the I ndo- Australian species. 



A. Body covered with granular scales and longi- 

 tudinal rows of widely distributed tubercles. 

 End of tail with a broad flap. Male with prae- 

 anal pores only i. P. homalocephalum p. 59. 



B. Body covered with granular scales only, no 

 tubercles. Tail bordered from base to tip by 

 rounded lobes. Male with praeanal and femoral 



pores 2. P. horsfieldi p. 61. 



