CHERSYDRUS 77 



whole length; palatines and pterygoids toothed. Hypapophyses 

 developed throughout the vertebral column. Scales not or but 

 slightly imbricate." (Boulenger.) 



This subfamily, consisting of several genera, is distributed 

 over southeastern Asia, the East Indies, and Central America. 

 Only Chersydrv^ is known in the Philippines. Xenodermus, 

 Acrochordus, Stoliczkaia, and Anoplohydrus enter the East 

 Indies, the first with a single species extending from Siam and 

 the Malay Peninsula to New Guinea ; the second extending from 

 the Malay Peninsula to Java and Sumatra ; the third has been 

 found in Borneo, but is apparently absent from the other East 

 Indian islands; and the fourth is from Sumatra. It is signif- 

 icant that most of these genera are monotypic. 



Genus CHERSYDRUS Cuvier 



Hydrus, part., Schneider, Hist. Amph. 1 (1799) 243. 



Chersydi~ws CuviER, Reg. Anim. 2 (1817) 75; Gray, Cat. Vip. Snakes 



(1849) 60; Dumeril and Bibron, Erp. Gen. 7 (1854) 40; Gunther, 



Rept. Brit. India (1864) 336; Boettger, Ber. Senck. Nat. Ges. 



(1886) 115; Boulenger, Fauna Brit. India, Rept. (1890) 355; 



Cat. Snakes Brit. Mus. 1 (1893) 173. 

 Aerocyiordus, part., Schlegel, Phys. Serp. 2 (1837) 424. 

 Potamophiis, part., Schmidt, Abh. Naturw. Hamb. 2 (1852) 75. 



"Teeth subequal, 12 to 15 in each maxillary. Head not distinct 

 from neck, small, covered with granular, juxtaposed scales; 

 nostrils close together on the top of the snout ; eye very small, with 

 vertically subelliptic pupil. Body stout, compressed ; scales very 

 small, juxtaposed, rhomboidal, with a short tubercle-like keel, 

 spinose on the belly; no ventral shields; a fold of the skin 

 running along the median line of the abdomen. Tail short, 

 compressed, prehensile, scaled like the body." (Boulenger.) 



For the distribution of the family see that of the single species. 



CHERSYDRUS GRANULATUS (Schneider) 



Plate 3, fig. 1 



Hydrus granulatus Schneider, Hist. Amph. 1 (1799) 243. 



Acrochordus fasciatus Shaw, Zool. 3 (1802) 576, pi. 130; Schlegel, 

 Phys. Serp. 2 (1837) 429, pi. 14, figs. 14-16. 



Pelamis granulatus Daudin, Rept. 7 (1803) 370. 



Acrochordus granulatus Cantor, Cat. Mai. Rept. (1847) 59. 



Chersydrus granulatus Gray, Cat, Vip. Snakes (1849) 61; Gunther, 

 Rept. Brit. India (1864) 336; Theobald, Cat. Rept. Brit. India 

 (1876) 186; Boulenger, Fauna Brit. India, Rept. (1890) 355, 

 fig.; Cat. Snakes Brit. Mus. 1 (1893) 174; Griffin, Philip. Journ. 

 Sci. § D 6 (1911) 255. 



Chersydrus annulatus Gray, Cat. Snakes (1849) 61. 



Potamophis fasciata Schmidt, Abh. Naturw. Hamb. 2 (1852) 75. 



Chersydrus fasciatus Dumeril and Bibron, Erp. Gen. 7 (1854) 41. 



