FORMOSAN SNAKES. 1 89 



7. Natrix swinhonis (Günther). 



Measurements of the specimens. 



Collection. 



No. 



Locality. 



Date. 



Collector. 



Scale rows 



m 

 "ri 



> 



Anal. 



d 

 T3 

 3 

 ri 

 U 

 >Q 

 3 



cn 



Oculars. 



6 



cu 



1 



-i ^ 



ET— 



Total 

 length. 



Length I 

 of tail. 1 



Formosan 

 Mus. 





Bansbiro, 

 Kagi 



May 14, 

 1907 



Kikuchi 



15 



•37 



2 



62 



'»3 



1t2 



l + :< 

 ÇR) 



6 



m.ni. 

 463 



m.in. 

 122 





li 







1» 



15 



142 



2 



58 



1,2 



I J- 2 



6 



5SO 



III 



8. Natrix trianguligerus (Bote). 



Measurements of the specimens. 



Collection. 



No. 



Locality. 



Date. 



Collector 



Scale rows. 



Ventrals. 



Anal 



Subcaudals 



Oculars. 



Temporals. 



Supra - 

 labials. 



Total 

 length 



M rt 



c 



V <*« 



HH O 



Formosan 

 Mus. 



86 







Kikuchi 



19 



144 



2 



71 



i,3 



2 + 2 



9 



in.m, 

 420 



ni. m 

 IOO 



9. Natrix namiei n. sp. 



Rostral twice as broad as deep, just visible from above ; nasal 

 semidivided ; internasal much narrowed in front, with convex outer 

 border, as long as prefrontals which are broader than long and 

 broadly in contact with supraocular ; frontal once and a halt 

 so long as broad, longer than the distance from tip of snout but 

 considerably shorter than parietals ; loreal divided into two shields, 

 the upper one very small ; three pre-and three post-oculars ; three 

 suboculars separating the eye from labials ; anterior temporals 3, the 

 following ones differentiated into minor shields ; 7 supralabials, the 

 fifth, sixth and seventh largest ; four lower labials in contact with 

 anterior chin-shields, which are shorter than the posterior. Scales very 

 strongly keeled, in 25 rows ; 149 ventrals ; anal divided ; 52 pairs of 

 subcaudals. 



