388 OPHIDIA. 



the scales as smooth, whilst they are keeled in our species, as in all the Trimeresuri. Mr. Elliot possesses 

 a drawing of a young specimen, named T. malabaricus, Jerd. It resembles our species in coloration, but 

 has a white, black-edged temple-streak instead of a black one. Mr. Jerdon does not mention either a 

 black or a white temple-streak. 



Quite indeterminable is another of Mr. Jerdon's species, for which he has proposed in his notes the 

 name of T. ivardii, 1. c. 



Teimeresueus monticola. (Plate XXIV. fig. B.) 



Parias* maculata, Gray, Ann. ^ Mag. Nat. Hist. 1853, xii. p. 392 (not Trimesurus maculatus) . 



The second upper labial shield forms the front part of the facial pit ; a pair of small shields 

 behind the rostral. Scales on the head smooth, those of the body slightly but distinctly 

 keeled, in twenty-three series. Ventrals 137-141 ; subcaudals 41. Male blackish ash, female 

 and young pale brown ; two series of square black spots along the back : the spots of the two 

 series are either placed alternately with each other, or they are confluent into a single series 

 of large quadrangular spots; sides with small, rounded black or brown spots; a white or 

 yellow streak runs from the back edge of the eye to the side of the neck ; the middle of the 

 neck with a Y-like yellow or whitish mark, more distinct in the male than in the female ; 

 belly densely marbled with brown. 



We have received this species from Nepal and from Sikkim; an adult female is 21 inches 

 long, the tail measuring 2^ inches. 



Trimeresurus wagleri. 



Trigonocephalus wagleri, Schleg. Phys. Serp. ii. p. 542. pi. 19. figs. 16-18. 



Trimesurus macidatus. Gray, Zool. Misc. p. 48, and Viper. Snakes, p. 8. — [This TV. maculatus is 



composed of young specimens of Tr. wagleri, Schleg., and of Tr.formosus, Gray; I consider 



the latter as a Bornean variety of IV. wagleri, and diflerent from the Tr. formosus of Miiller 



and Sehlegel.] 

 Trigonocephalus sumatranus. Cantor, Mai. Rept. p. 121. pi. 40. fig. 9 (not Coluber sumatranus, 



Raffles, a snake said to have 184 ventral shields). 

 Trimesurus sumatranus, Gray, Viper. Snakes, p. 10. 

 subannulatus, Gray, Viper. Snakes, p. 9. Motley ^' Dillwyn, Nat. Hist. Labuan, p. 44 



c. tab. (var.). 

 formosus. Gray, Viper. Snakes, p. 10 (not Mull. ^ Schleg.). 



The shield forming the front part of the facial pit is separate from the second upper labial. 

 The whole upper surface of the head covered with strongly keeled scales ; supraciliary shield 

 present. Scales in from twenty-three to twenty-five series. Ventrals 139-150 ; subcaudals 

 42-53. Coloration very variable according to age and locality: either green with whitish 

 spots or transverse bands ; or black with yellow spots. The Malayan variety shows the fol- 

 lowing coloration : — 



Young : Grass-green above, lighter on the sides ; a cinnamon-red line with the upper 



* All the Farias of Gray have keeled scales. 



