11. LACHEsIs. 545 
Bothrops mexicanus, F, Miill. Verh. Nat. Ges. Basel, vii. 1882, 
p. 154. 
Trigonocephalus affinis, Garm. N. Amer. Rept. p. 125 (1883). 
Thanatophis nummifer, Posada-Arango, Bull. Soc. Zool. France,~ 
1889, p. 343. 
Snout broad, rounded, with moderately marked canthus. Rostral 
as deep as broad or a little broader than deep ; nasal divided, some- 
times separated from the rostral by a series of small scales; upper 
head-scales imbricate, strongly keeled, 7 to 10 in a series between 
the supraoculars, which are very narrow and sometimes broken up; 
no enlarged internasals ; three or four series of scales between the 
eye and the labials; temporal scales strongly keeled; loreal pit 
separated from the labials by small scales; 10 or 11 upper labials, 
fourth and fifth largest. Scales in 25-27 rows, strongly keeled, 
tubercularly on the back in the adult. Ventrals 121-134; anal 
entire; subcaudals 26-36, all or greater part single. Pale brown 
above, with a dorsal series of dark brown, black-edged, rhomboidal 
spots, which may be confluent and form a zigzag band; a lateral 
series of dark brown or black spots or vertical bars; a dark brown 
streak on the side of the head, from the eye to the angle of the 
mouth; whitish beneath, uniform or spotted with dark brown. 
Total length 800 millim. ; tail 90. 
Mexico and Central America. 
a-c. 3 (Sc. 25; V.131; Mexico. Mr. H. Finck [C.]. 
C. 35), 9 (Se. 23; V. 
134; 0. 26), & hgr. (Se. 
293; V. 182; C. 32). 
d. Her. (Se. 25; V. 128; -Teapa, Tabasco. F. D. Godman, Esq. 
C. 32 ; 
. 82). P.}. 
e. Hgr. ‘Be, 25; V.133; Huatuzco, Vera Cruz, F. D oe Esq. 
C. 31). he 
4. 2 * So 27, 27; V. Vera Paz, low forest. O. Salvin, Esq. [C.]. 
129, 128; C. 33, 82) 
& her. (Sc. 25, 27; V. 
121, 125; C. 35, 33). . 
k-l. 9 (Sc. 27, 25; V. Hacienda, Rosa de Dr. E. Rothschuh 
129, 129; C. 82, 30). Jericho, Nicaragua, [C.]. 
3250 ft. 
m. Q (Sc. 25; V. 180; Matagalpa, Nicaragua. ee E. Rothschuh 
C. 32 
. 82). ai 
n. 2 (Sc. 25; V. 126; Monte Redondo, Costa Mr. C.F. Underwood 
C. 28). Rica. [C.]. 
13. Lachesis godmani. 
Bothriechis godmanni, Giinth. Ann. & Mag. N. H. (8) xii. 1863, 
p. 364, pl. vi. fig. G, and Biol. C.-Am., Rept. p. 190, pl. lvii. fig. A 
(1895). 
Bothrops brammianus, Bocourt, Ann. Sc. Nat. (5) x. 1868, p. 201. 
Bothriopsis godmannii, Cope, Proc. Ac. Philad. 1871, p. 208. ‘ 
Bothrops (Bothriopsis) godmanii, F. Mull. Verh. Nat. Ges. Basel, vi. 
1878, p. 402, pl. iii. fig. B. 
VOL, III. 2N 
