11. LACHESIS. 557 



Snout with strong canthus, oblicjnely truncate, more prominent 

 than in L. gramineus ; eye small. Rostral as deep as broad ; nasal 

 entire or divided ; upper head-scales small, smooth, imbricate, 8 to 



10 in a transverse series between the supraoculars, which are 

 narrow ; two or three scales separating the internasals in front ; 

 two or three postoculars and a subocular, which is in contact with 

 the third or third and fourth labials ; temporal scales smooth ; 9 to 



11 upper labials, second forming the anterior border of the loreal 

 pit, third largest. Scales smooth or feebly keeled, in 21 rows. 

 Ventrals 170-187 ; anal entire ; siiboaudals 55-73. Tail prehen- 

 sile. Bright green or olive above, uniform or spotted or barred with 

 reddish brown ; a series of bright yellow or salmon-pink spots on 

 the outer row of scales ; green, olive, or greenish yellow beneath ; 

 end of tail sometimes red. 



Total length 1060 millim. ; tail 160. 

 Philippine Islands. 



a, b. d (V. 184 ; C. 63) Philippines. H. Cuming, Esq. [0.]. 



& hgr. cJ (V. 178; (Types.) 



0. 65). 



c. Hgr. S (V. 182 ; 0. 73). Philippines. H. Cuming, Esq. [C.]. 



(Type of M. ornata.) 



d. Yg. (V. 178 ; 0. 61). Philippines. H. Cuming, Esq. [C.]. 



(Type of M. variegata.) 



e. cJ (V. 173 ; C. 64). Placer, N.E. Min- A. Everett, Esq. [0.]. 



danao. 

 f-4. 5 (V. 187 ; C. 66) & Luzon. Dr. A. B. Mever [C.]. 



yg. (V. 170, 181, 177; 

 C. 61, 55, 61). 



L. jiavomaeulatus should perhaps be regarded as a variety of 

 L. gramineus. 



27. Lachesis sumatranus. 



Coluber sumatranus, Rafles, Trans. Linn. Soc. xiii. 1822, p. 334. 

 Trigonocephalus formosus, Schleg. in Temm. Verh. Nat. Gesch. 



Nederl. Ind., Rept. p. 52, pi. vii. (1844). 

 Bothrops formosus, Jan, Elenco, p. 126 (1863), and Icon. Gen. 47, 



pi. V. fig. 1 (1875) : Modigliani, Ann. Mtis. Genova, (2) vii. 1889, 



p. 121. 

 Trimeresurus formosus, Bouleng. Ann. S,- Mag. N. H. (6) xvi. 1885, 



p. 388. 

 Bothrops sumatranus, v. Lidth de Jeude, Notes Leyd. Mus. viii. 1886, 



p. 52, pi. ii. fig. 6. 

 hageni, v. Lidth de Jeude, I. c. p. 53. 



Head rather elongate. Eostral as deep as broad or a little 

 broader than deep ; nasal entire or divided ; upper head-scales 

 rather large, flat, smooth, imbricate or subimbricate, largest on the 

 Snout, 4 to 9 in a transverse series between the supraoculars, 

 which are large ; two or three postoculars and a subocular, which 

 is in contact with the third or third and fourth labials ; temporal 

 scales smooth; 9 to 11 upper labials, second forming the anterior 

 border of the loreal pit, third largest. Scales feebly keeled, in 



