SNAKES. 75 



27. Hydrops. 



Head small, distinct, rather depressed ; frontal plates 3, small ; 

 anterior triangular, transverse ; vertebral and occipital moderate ; 

 superciliary small ; loreal none ; one large anterior and two posterior 

 oculars : eye over fourth labial : upper labial plates all simple ; 

 hinder large, high, the seventh largest and highest: body sub- 

 cylindrical ; scales rhombic, broad, smooth, truncated, polished, in 

 fifteen series ; ventral shield broad, rounded. 



Hydrops, Wagler, Si/st. Amph. 170, 1830. Gray^ ZooL Misc. 

 67. Fitz. S. JR. 25. Elaps sp., Wagler, Serp. Braz. Homalopsis 

 sp., Schlegel, Phys. Serf. 



1. The Hydrops. Hydrops Martii, Wagler., Syst. Amph. 170. 

 Gray., Zool. Misc. 67. Fitz. S. R. 25. Hydrops triangularis, 

 Wagler., Syst. Amph. 170. Homalopsis Martii, Schlegel, 356, t. 13, 

 /. 19, 20. Elaps Martii and E. triangularis, Wagler, Serp. Braz. 

 t. 2, /. 2, t. 2 a, f. 2, junior. ? Coluber Nicandri, Merrem, Tent. 

 97, from Seha, ii. t. 64, /. 2. 



Scales in 15 series, truncated : blackish ; body and tail with 

 numerous red-brown rings. 



Inhab. Brazil. Mus. Ley den. 



28. Hygina. 



Body elongate, slender, subcylindrical ; scales broad, rhombic, 

 smooth : ventral shields rather narrow, regularly rounded : head 

 small; crown rather depressed, shielded; one anterior large and 

 two posterior smaller ocular shields, lower hinder partly under the 

 eyes ; hinder labial plates large, seventh largest ; loreal shield none : 

 eyes small, over the fourth labial: anterior frontals 3; front one 

 transverse, triangular: tail elongate, tapering; subcaudal plates 

 two-rowed. America. 



Hygina, Gray, Zool. Misc. 67, 1842. 



1. The Hygina. Hygina fasciata. Gray, Zool. Misc. 67. 

 Blackish brown, with subalternating white cross-bands on the 

 sides and beneath. 



a, b. In spirits. Demerara. Presented by Lieut. Friend, R.N. 

 c—f. In spirits. Demerara. 



H 2 



