— 6 — 



occipital regions ; supraocular elongate, very narrow, occupying outer edge of 

 the supraocular region, their width being about one-fourth of the distance 

 between them ; about 7 scales on a line between supraoculars ; one prenasal, 

 rather large ; supranasal elongate, divided into- two shields, posterior one very 

 narrow ; nostril exceedingly large, in the middle of a large nasal ; two sub- 

 nasals, posterior one much larger than the anterior ; four loreals behind the 

 nasal, upper three subequal in size, the lowest one largest, in contact with 

 third supralabial ; eye on sides and below surrounded by 14 scales (13 on 

 right side) ; two rows of keeled scales between supralabials and suborbitals ; 

 temporals numerous, strongly keeled except the lower row, lower temporal 

 scales as large as the supralabials ; 11 supralabials, fourth largest ; four lower 

 labials in contact with anterior chin-shields ; posterior chin-shields scarcely 

 differentiated, separated by small scales ; 27 rows of pointed scales, all except 

 the outer row strongly keeled ; 164 ventrals ; anal entire ; 54 pairs of 

 subcaudal. 



Color (in alcohol) pale grayish brown above, with three longitudinal 

 series of dark brown, black-rimmed and narrowly white-edged spots, of which 

 the median series much larger than the others ; interspaces between each spot 

 are occupied by irregular small spots of the same color ; top of head of the 

 ground color, with three large spots similar to those on body, one on the 

 interorbital space, followed by two others; a dark rather broad, postocular 

 baud reaches to the angle of mouth, occupying temporal region ; labials 

 whitish, broadly edged or mottled with black ; underside white, with trian- 

 gular black spots; subcaudals dusky, mottled with black. 



Total length 800 mm. 



Snout to vent 670 mm. 



Vent to tip of tail 130 mm. 



Described from a specimen from Ako, collected by Eiji Matsuda in 

 August, 1919. 



Habitat : — Ako, Southern Formosa ; Chipon and Kwarenko, Eastern 

 Formosa. 



Remarks : — In three other specimens preserved in the museum of the 

 Government Institute of Science, supranasal is not divided into two shields 



