11. LACHESIS. 553 



23. Lachesis luteus. 



Trimeresurus luteus, Boettg. Jahresb. Offenb. Ver. Nat. 1895, p. 111. 



Eostral broader than deep ; nasal divided ; upper head-scales 

 very small, flat, juxtaposed, smooth on the snout and vertex ; supra- 

 ocular large ; no internasals ; 12 or 13 scales on a line between the 

 supraoculars ; two or three small postooulars and a subocular, which 

 is separated from the labials by two series of scales ; temporal 

 scales keeled ; 7 or 8 upper labials, second forming the anterior 

 border of the loreal pit, third and fourth large. Scales strongly 

 keeled, in 23 or 25 rows. Ventrals 18^-186 ; anal entire ; sub- 

 caudals 72-74. TeUow above, with a dorsal series of rhomboidal 

 dark, black-edged spots partly confluent into a zigzag .band ; a 

 lateral series of small spots ; a blackish streak on each side of the 

 head behind the eye ; yellowish beneath, spotted and clouded with 

 grey. 



Total length 945 millim. ; tail 164. 



Loo Choo Islands. 



24. Lachesis purpureomaculatus. 



Trignnocephalus purpureomaculatus, Gray, 111. Ind. Zool. i. pi. Ixxxi. 



(1832). 

 Trimesurua purpureus, Gray, Zool. Misc. p. 48 (1842), and Cat. p. 8 



(1849). 



carinatus, Gray, II. cc. 



Trigonocephalus puniceus {nan Boie), Cantor, Cat. Mai. Hept. p. 122 



(1847). 

 Trimesurus bicolor, Gray, Ann. 8f Mag. N. H. (2) xii. 1853, p. 392. 

 Oryptelytrops carinatus, Cope, Proa. Ac. Philad. 1859, p. 340. 

 Trimeresurus porphyraceus, Blyth, Journ. As. Soc. Beng. xxix 1861, 



p. 110 ; Theob. Journ. Linn. Soc. x. 1868, p. 64 ; Stoliczka, Journ. 



As. Soc. Beng. xxxix. 1870, p. 218 ; Theob. Cat. Rept. Brit. Ind. 



p. 222 (1876). 

 — ■ — carinatus, Giinth. Rept. Brit. Ind. p. 386 (1864) ; Stoliczka, 



I. c. p. '217 ; Fayrer, Thanatoph. Ind. pi. xiii. (1874) ; Theob. Cat. 



B^pt. Brit. Ind. p. 221. 



purpureus, Giinth. I. c. p. 387. 



andersonii, Theob. Cat. Bept. As. Soc. Mus. 1868, p. 75 ; Sto- 

 liczka, I. c. p. 216, and Journ. As. Soc. Beng. xl. 1871, p. 443 ; 



Fayrer, I. c. pi. xv. ; Theob. Cat. Bept. Brit. Ind. p. 224. 



obscurus, Theob. Cat. Bept. As. Soc. Mm. 1868, p. 76. 



montioola, part., Anders. Proo. Zool. Soc. 1871, p. 194. 



purpureomaculatus, Bouleng. Faun. Ind., Rept. p. 429 (1890), 



and Proc. Zool. Soc. 1890, p. 36 ; W. Sclater, Journ. As. Soc. Beng. 



Ix. 1891, p. 248. 



Eostral as deep as broad ; nasal entire ; upper head-scales very 

 small, juxtaposed, convex or obtusely keeled; supraocular very 

 narrow, sometimes broken up ; internasals small, separated from 

 each other by one or two scales ; 12 to 15 scales in a transverse 

 line between the supraoculars ; two or three small postoculars and 

 a subocular, which is separated from the labials by two or three 



