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shields are entirely separated), its lower portion is considerably- 

 broader than that of the fronto-nasal. The fronto-nasals extend 

 behind the rostral but remain widely separate. 



Praeocular sub-equal in size to the ocular, which extends as far 

 back as the hinder labial. The first labial in contact with the 

 rostral and nasal. The second with the nasal, fronto-nasal, and 

 prseocular. The third slightly ascends between the praeocular 

 and ocular. The fourth below the ocular. Scales of body in 

 26 longitudinal and about 300 transverse rows. 



Colour blackish olive above, gradually passing to dull yellowish 

 on the belly. Grows to 17 inches. Circumference ^th of 

 entire length. 



Inhabits the Khasi Hills, Assam and Tenasserim. 



T. striolatus, Peters. 



Upper portion of rostral band-shaped, broader than the lower 

 and extending to between the eyes. The nasal is partly united 

 with the fronto-nasal above the nostril and touches the first and 

 second labials. Fronto-nasals not contiguous behind the rostral, 

 their lower portion as long as the corresponding part of the 

 nasals, their hinder margin concave. The second labial in con- 

 tact with the nasal, fronto-nasal and prseocular. The third 

 labial is acutely wedjed in between the prseocular and ocular, 

 which are equal. Eye very distinct. Supraorbitals and parietals 

 broader than the frontals which are equal. Intraparietal nearly 

 twice as broad as frontal. 



Scales of body in 24 tranverse rows. 



Tail shorter than head, terminating in a minute spine. 



Colour olive brown above. The darker terminal part of each 

 Bcale separated from the lighter base by a yellow, posteriorly 

 dark edged transverse streak. Below paler. Grows to 12' 5 

 inches i 



Inhabits Lower Bengal. 



T. bothriorhynchus, Giinther, 

 A round groove larger than the nostril on the suture between 

 the nasal and fronto-nasal, below the nostril; another similar 



