HYDROPHIS. 



18S 



II. Head very small ; neck very slender ; 

 eye not much shorter than its distance 

 from mouth. 

 A. 23-40 scales round neck, 33-55 round 

 body. 



1. Two superposed anterior temporals. 

 35-38 scales round neck, 48-50 round body ; 



ventrals 280-309 *. . H. ccsrulescens, p 187. 



27-29 scales round neck, 39 round body ; 



ventrals 310-331 H. nigrocincttis, p. 187. 



2. A single anterior temporal. 



a. Third labial not in contact with 

 prsefrontal. 

 u. Frontal as long as its distance 

 from rostral. 

 Rostral broader than deep ; 31-40 scales ' 

 round neck, 40-50 round body ; ventrals 



310-438 H. diadema, p. 188. 



Rostral broader than deep ; 31 scales round 



neck, 55 round body ; ventrals 422 H. rhomhifer, p. 188 



Rostral nearly as deep as broad ; 25-31 

 scales round neck, 40-48 round body ; 



ventrals 345-500 H.fasciatus, p. 189. 



/3. Frontal much shorter than its 

 distance from rostral. 



5 upper labials ; 25 scales round neck, 33 



round body ; ventrals 360 H. Mossi, p. 190. 



6 or 7 upper labials ; 33-45 scales round neck, 



43-45 round body ; ventrals 240-290 .... H. torquatus, p. 190. 

 c. Third labial in contact with pra3- 

 frontal ; 23-25 scales round neck, 

 41-47 round body ; ventrals 412- 



456 H. cantoris, p. 191. 



B. 19-21 scales round neck, 29-33 round 



body ; ventrals 225-297 H. f/rucilis, p. 191, 



197. Hydrophis stokesii. 



Hydrus stokesii, Gray, in Stokes, Discov. Austral, i, p. 502, pi. iii 



(1846). 

 Hydrophis annulatus, Grav, Cat. Sn. p. 59 (1849). 

 Hydrophis stokesii, Giinth". Rept. Brit. Ind. p. 363 (1864). 

 Distira stokesii, Bouleng. Faun. Brit, lud., Rept. p. 408 (1890 \ : 



id. Cat. Sn. iii, p. 288 (189G). 



Head moderate ; body stout. Eye shorter than its distance 

 from the mouth. Rostral as deep as broad ; frontal longer 

 than broad, as long as or slightly longer than its distance from 

 the rostral ; one proe- and two postoculars ; 9 or 10 upper 

 labials, fourth, fifth, and sixth entering the eye, if not divided 

 to form a series of suboculars ; 2 or 3 superposed anterior 

 temporals ; no chin-shields. 39 to 47 scales round neck, 48 to 57 



