Key to the Species of Hypnale

1a. No small scales between postfoveal and 3rd supralabial; no diamond-shaped scale between postocular, 1st lower temporal, and 4th and 5th supralabials, which are in contact (Figs. 1 a, 6a, 8a); hemipenial lobe not spinous (Figs. 1 d, 6d) ................................................................................................................................................................................. 2

1b. 1–3 small scales between postfoveal and 3rd supralabial (Fig. 4 a); a diamond-shaped scale between postocular, 1st lower temporal, and 4th and 5th supralabials (Fig. 4 a); hemipenial spines present (Fig. 4 d) ................ Hypnale nepa

2a. Snout tip not elevated; 3–5 small scales behind rostral (Figs. 1 a, 8a); lacunal scale present (Figs. 1 a, 8a)................. 3

2b. Snout tip distinctly elevated (Fig. 6 a); 10–19 small scales comprise wart-like protuberance behind rostral (Fig. 6 a); lacunal scale absent (Fig. 6 a) .................................................................................................................. Hypnale zara

3a. Two rows of distinct suboval or subtriangular blotches meet on dorsal midline, bilaterally symmetrical (especially on tail), sometimes displaced longitudinally on body (Fig. 3 b); 1st infralabials contact one another at a median suture (Fig. 1 c); 7–8 supralabials ......................................................................................................... Hypnale hypnale

3b. A distinct purple-brown, about 3 scales wide paravertebral stripe extends from neck to level of vent (Fig. 9 a); 1st infralabials contact each other on mid line, forming a single scale (Fig. 8 c); 8 or 9 supralabials .... Hypnale sp. ‘amal’