74 



T. piscator p. 75. 



Key to the Ind o- Australian species. 



A. Maxillary teeth gradually enlarged posteriorly. 



I. Internasals much narrowed in front ; nostrils 

 directed upwards and outwards; scales in 19 

 rows ....................... I- 



II. Internasals broadly truncate in front ; nostrils 

 lateral. 



a. Scales in 15 rows. 



f Upper labials 8 usually. 

 X Subcaudals less than 60. 



1. Scales strongly keeled; three or four 

 postoculars ............... 2. 



2. Scales feebly keeled; two postoculars. 3. 



3. Scales feebly keeled; three post- 

 oculars. 



aa. Internasals shorter than praefron- 

 tals; frontal longer than its dis- 

 tance from the tip of the snout. 4. 

 bb. Internasals as long aspraefrontals; 

 frontal as long as its distance from 

 the tip of the snout ....... $. 



XX Subcaudals usually more than 60. 



1. Ventrals 137 141 ; subcaudals 



65 75; i prae- and 3 postoculars. 6. 



2. Ventrals 137 170; subcaudals 



51 no; 2 prae- and 3 postoculars. 7. 



3. Ventrals 164; subcaudals 76; 2 prae- 

 and 3 postoculars; tail with longitu- 

 dinal dark bands ........... 8. 



4. Ventrals 162 165; subcaudals 72 ; 2 

 prae- and 3 postoculars; posterior part 



of body with dark longitudinal lines. 9. 

 ft Upper labials 9. 



aa. Ventrals 162; belly white, with 6 longi- 

 tudinal rows of black dots ...... 10. 



0. Ventrals 172 180; belly white ante- 

 riorly, speckled and powdered with 

 blackish in the middle, black poste- 

 riorly ................... ii. 



. Scales in 17 rows. 



I. Three labials entering the eye; ventrals 

 141 158; subcaudals 50 85 ...... 12. 



T. picturatus p. 76. 

 T. truncatus p. 77. 



T. celebicus p. 78. 



T. novae-gnineae p. 78. 



T. sarasinorum p. 79- 



T. mairi p. 79. 



T. montanus p. 80. 

 T. elongatus p. 80. 

 T. punctlventris p. 81. 



T. halmahericus p. 82. 

 T. doriac p. 82. 



