NATURAL SCIENCES OP PHILADELPHIA. 



347 



We suspect that the true ground of separation of this genus from Hydrophis 

 will be found to be the separation of the frontals from the superior labials by 

 the intervention of the fronto-nasals and preocular, and not the presence of 

 rudimentary gastrosteges. The latter peculiarity is possessed in a less degree 

 by Hydrophia striata, H. nigrocincta, and others. The genus thus 

 defined would include H. p achy c e r c u s, Fischer, loc. cit, pi. 2. Should it, 

 however, be the opinion of herpetologists that the genus be referred to Hydro- 

 phis, as has been done by Dr. J. G. Fischer, the species which we possess must 

 Still continue distinct, as observed by Prof. Jan, its describer. 



58. D. Dumerilii Jan, Rev. et Mag. de Zoologie, 1859, p. 149. Aline 

 from the nostril to the posterior border of the frouto-nasal separates a part of 

 it, which is analogous to the nasal. One postocular. Except two on the neck 

 the slate-black rings are complete, and occupy three gastrosteges. The back 

 between the rings is light slate-color. Tail slate black. 



One sp. ? ? 



Hydbophis Daud. 

 Hist. Rept. vii. 



59. H. Schlegeli Fischer. Abhandl. der Naturwissenschaftlichen Ham- 

 burg, iii., p. 50, 1856. Thalassopkis Schlegeli Schmidt, ibid, ii., p. 83, 1848. ? 

 Chitidia inornata G-ray, Cat. Brit. Mas., p. 56, 1849. 



One sp. Manilla. Dr. Burroughs. 



60. H. gracilis Schlegel. 

 Gray, Cat. Brit. Mus. 

 One sp. Gulf of Siam. 



61. H. striatus Schlegel. 

 One sp. ? 



Microcejphalophis gracilis Lesson, Voy. Belauger. 



A. A. Henderson. 



Lapemis Hard- 



62. H. p e 1 a m i d o i d e s Schlegel. Fauna Japonica, 1838 

 wickii, Gray, Zool. Misc., 1842. 

 Four sp. Gulf of Siam. 



One sp. " " 



One sp. Java. 



Five sp. ? 



Two of our specimens have two postoculars on each side. 

 a large loral on each side. 

 the other. 



Var. annulata Fischer 

 One sp. Manilla. Dr. Burroughs 



While our specimen coincides in all important particulars with Dr. Fischer's 

 plate cited, it differs in having the bands of a chocolate color, each dark scale 

 with a light shade in the middle. The body is rather more compressed than in 

 the ordinary pel am idoides , and there are no traces of carination. Nam 

 Lapemis curtus, Gray, loc. cit ? 



Pelamis Daud. 



A. A. Henderson. 

 Dr. Burroughs. 

 Capt. Harwick. 

 ? 



One of these has 

 Another has two postoculars on one side, one on 



loc. cit., pi. 3. 





