294 é COLUBRID. 
19 rows, more or less strongly keeled. Ventrals 130-157; anal 
entire; subcaudals 37-67. Coloration very variable. 
Total length 360 millim. ; tail 60. 
From Mexico to Venezuela and Ecuador. 
A. Five lower labials in contact with the anterior chin-shields ; 
fourth, fourth and fifth, or third and fourth upper labials 
entering the eye. Dark brown or blackish above, with or 
without a yellowish collar; belly yellowish, uniform or dotted 
with brown. (S. lansbergi, D. & B.; N. spilogaster, Peters.) 
a. 9 (V. 143; C. 43). Intac, E. Ecuador. Mr. Buckley [C.}. 
b. 2 (V.149; meee Pallatanga, E. Ecuador. Mr. Buckley [C.]. 
c-d. 9 (V. 148; C.51) Puerto Caballo. Prof. Peters [ P.}. 
& hgr. (V. 142; C.?). 
e, f. 2 (V. 153, 147; Caracas. 
C. 47, 49). , 
g- 3 (V. 150; C. 59). Colombia. 
B. Four lower labials in contact with the anterior chin-shields ; 
fourth, or third and fourth upper labials entering the eye. 
Dark brown or blackish above, with a more or less distinct 
yellowish collar or occipital blotch ; belly yellowish or brown. 
(C. atratus, Hallow. ; S. drozii, D. & B.) 
a. 9 (V. 153; C.47). W. Ecuador. Mr. Fraser [C}. 
b, 9 (V. 157; C. 50). Puerto Cabello. Prof. Peters [P.]. 
C. Four (rarely five) lower labials in contact with the anterior 
chin-shields ; third and fourth upper labials entering the eye. 
Head and body brown or purplish grey above; a black bar 
across the nape; black spots or cross bars on the back ; belly 
yellowish, with square black spots, which may become con- 
fluent and form three stripes. (S. maculatus, Peters, pavi- 
mentatus, Bocourt.) 
a-d. 3 (V. 142; C. 62)& 9 Cartago, Costa Rica. 
(V. 141, 155, 140; CO. 50, 53, 52). 
e. d (V. 180; C. 56). Chontales, Nicaragua. 
D. Four (rarely five) lower labials in contact with the anterior 
chin-shields ; third and fourth (rarely fourth and fifth) upper 
labials entering the eye. Head and nape black, separated by a 
yellow collar; body red or reddish brown above, uniform, or 
spotted, or barred with black ; belly yellow, uniform or dotted 
with brown. (S. sebe, D. & B.; E. fasciatus, Hallow. ; S. col- — 
laris, Jan.) 
a. 3 (V. 140; C. 65). Chontales, Nicaragua. ; 
b. 2 (V. 188; C. 50). Guatemala. O. Salvin, Esq. [C.}. 
ec. 9 (V. 186; C. 50). eT coast of Guate- O. Salvin, Esq. [C.). 
mala, 
d. 9 (V.146; 0.51). Yzabal. __ O, Salvin, Esq. [0.}. - 
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