CHECK-LIST AND KEY OF PHILIPPINE SNAKES, 263 



a^. Nostrils valvular, on the upper surface of the snout; aquatic snakes. 



Subfamily Homalopsinas. 

 6'. Nasals in contact. Scales keeled; numerous small scales in place of the 



parietals Grcnus Hurria. 



c'. Four lower labials in contact with the anterior chin-shields ; scales strongly 

 keeled, in 23 to 27 rows, ventrals 132 to 160. Light brown above and 

 below, spotted and barred with dark brown. 



Hurria rhynchops (Schneider). 

 Manila {Jan) ; Batu, Daraga, and Buhi, Luzon (Peters) ; Negros 

 {Giinther) ; Placer, Mindanao (Gilnther) ; Palawan [Boulenger) ; Ban- 

 tayan, Polillo, Palawan, Cuyo (Bureau of Science oolleotion). Found 

 along the coasts of India, Ceylon, the Malay Peninsula and Archipelago, 

 the Pelew Islands, Timor, and the Moluccas. 

 cr'. Three lower labials in contact with the anterior chin-shields; scales fully 

 keeled, in 29 rows; ventrals 163 to 165. Color about the same as in 



Hurria rhynchops (Schneider) Hxirria microlepis (Boulenger). 



Philippines (Boulenger); Camiguin (Bureaii of Science collection). 

 Not recorded from any other locality. 

 6". Nasals separated by a single internasal. Dark olive or gray above, with 

 . a broad white band on each side. 



Gerardia prevostiana (Eydoux et Gervaise. ) 

 Manila (Dumiril and Bihron). Found along the coasts of India, Ceylon, 

 and Burma, 

 a^ Nostrils not valvular, lateral; mostly tree or bush snakes. 



Subfamily Boiginse. 

 6'. Anterior mandibular teeth strongly enlarged ; scales without pits ; sub- 

 caudals single; pupil round; scales smooth; solid maxillary teeth equal, 

 20. Hypapophyses developed to some extent throughout the vertebral 

 column. Brown above, with black spots on the head and neck, and a black 

 line on each side of the posterior part of the body and the tail; lower 



parts yellowish _ Hologerrum philippinum Gilnther. 



Philippines (Boulenger) . A genus containing only a single species, and 

 limited to the Philippines. 

 6". Solid maxillary teeth subequal ; head very distinct from neck, pupil vertical. 



Genus Boiga. 

 c'. Anterior palatine teeth but slightly enlarged. 



(P. Snout longer than the diameter of the eye; scales in 21 rows. Ringed 

 by alternating, broad black and narrow yellow, bars. 



Boiga dendrophila (Boie). 

 Samar ( Peters ) ; Mindanao ( Giinther ) ; southern Mindanao ( J. G. 

 Fischer) ; Palawan and Mindanao (Boulenger) ; Palawan, Rizal 

 Province, Polillo (Bureau of Science collection). Found throughout 

 the Malay Peninsula and Archipelago. 

 dr. Snout as long as the eye; scales in 19 rows. Grayish or yellowish brown, 

 with dark brown spots and cross bars, the latter extending across the 



belly _ Boiga angulata (Peters). 



Leyte (Peters); Polillo (Bureau of Science collection). A strictly 

 Philippine species, 

 c^. Anterior palatine teeth strongly enlarged. 



d^. Scales in 19 rows. Brownish yellow above with black cross-bars. 



Boiga philippina (Peters). 

 Luzon (Peters). Not found elsewhere. 



