LEVITON, BROWN, & SILER: PHILIPPINE VENOMOUS SNAKES 
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B 
A 
Figures 24A-B. Head and body dimensions: (A) head and anterior fourth of body slender {Hydrophis atriceps); 
(B) head and anterior portion of body not distinetly narrowed {Hydrophis ornatus) 
Figures 25A-B. Anterior temporal scales: (A) one anterior temporal scale {Hydrophis spiralis)', 
(B) two anterior temporals scales {Hydrophis cyanocinctus). 
Figures 26A-D. (A-B) Hydrophis cyanocinctus', (C-D) Hydrophis spiralis. Photos courtesy of Harold Voris. 
around midbody 30^3; lowermost lateral seale rows slightly larger than upper lateral seales; 
dorsal seales posteriorly hexagonal, juxtaposed; ventrals usually distinet on anterior fourth of 
body, entire and broader than adjacent dorsal scales, posteriorly distinctly divided by a medi¬ 
an groove. Hydrophis gracilis 
39b. Head and neck normal, not narrow (Fig. 28); scale rows around neck 23-31; scale around mid¬ 
body 25^3; dorsal scales, lowermost lateral scale rows larger than upper lateral scales 
(Fig. 27D); ventrals usually distinct on anterior fourth of body, posteriorly barely larger than 
adjacent scales or not enlarged at all, not divided by a longitudinal groove; greenish or olive 
to gray above, whitish below, 35-55 narrow dark bands, occasionally uniform dark gray; 3-6 
maxillary teeth behind each fang. Hydrophis [Lapemis\ curtus (Figs. 28-29) 
40a. Dorsal scales pointed, strongly imbricate (Fig. 27B); ventrals in two halves; 6-7 maxillary 
teeth behind each fang. Hydrophis [Astrotia] stokesii 
