Tele. 
12. 
Not as above 6 
Head dark red; body with more than 30 reddish, square 
markings; tail ringed with red and brown moellendorffi 
Not as above i 
Top of body and tail with large, dark brown, round spots; 
side of body and tail with smaller, irregular spots... 
davidi 
Body usually with indistinct light crossbars... 
schrenki 
Only stripe on head a short, dark postorbital one; back with 
black trapezoidal blotches, at rear of body forming black 
stripe taeniura 
Not as above 9 
Top of head with 3 short, longitudinal stripes not crossing 
head porphyracea 
Stripes or bands cross top of head 10 
Body with stripes Nal 
Body with spots, diamonds, or crossbars 2 
Stripes on top of head form 2 V's, each continuous with 
stripes on body rufodorsata 
Stripes on top of head form one V continuous with stripes on 
body dione 
Body with a row of round, dark spots on each side connected 
over back by dark crossbars bimaculata 
Not as above 13 
Back with large dark diamonds having light centers... 
mandarina 
Back with black crossbars perlacea 
Lycodon 
No preocular, prefrontal and loreal border eye; dorsal 
scales weakly keeled; back black, a few (10) white crossbars 
anteriorly subcinctus 
Preocular present; prefrontal not bordering eye 2 
Scales smooth; loreal not bordering eye 3 
Middle scale rows weakly keeled; loreal not touching 
internasal 4 
Loreal with a broad contact with internasal aulicus 
Loreal narrowly in contact with internasal laoensis 
Back and belly with black and yellow rings fasciatus 
Back with alternating black and white crossbands; ventrals 
white ruhisitra ta 
Natrix 
One preocular; 7 upper labials; back uniform olive green 
natrix 
Three preoculars; 8 upper labials; back with alternately 
arranged, large black spots tesselata 
Oligodon 
Fewer than 17 scale rows at midbody 2 
At least 17 scale rows at midbody 4 
Scale rows 13 at midbody eberharti 
