Oxyrhabdium

Key to Philippine species.

1a. Loreal scale separated from or in contact with second supralabial scale; if loreal scale in contact with second supralabial scale, their length of contact is less than half the length of the contact between loreal and postnasal scales (Fig. 42A); usually eight supralabial scales (rarely seven), with fifth and six (rarely fourth and fifth) supralabial scales bordering eye (Fig. 42A); dorsal surfaces of head, body, and tail brown or reddish-brown in color; juveniles have distinct white nuchal collar, but lack light crossbands on other parts of the body............................................................... Oxyrhabdium modestum

1b. Length of contact between loreal scale and second supralabial scale similar to length of contact between loreal scale and postnasal scale (Fig. 42B); seven supralabial scales, with fourth and fifth supralabial scales bordering eye (Fig. 42B); dorsal surfaces of head, body, and tail dark gray or olive in color; juveniles have distinct white nuchal collar plus light crossbands on other parts of body and tail; pale crossbands may be faintly visible in adults....................... 2

2a. Adult dorsal color pattern uniform (lacking pale crossbands); number of ventral body scales + subcaudal scales 192–230.......................... Oxyrhabdium leporinum leporinum

2b. Adults and juveniles with narrow white dorsal body crossbands and white nuchal collar; number of ventral body scales + subcaudal scales 221–235... Oxyrhabdium leporinum visayanum