294 COLVBRID^. 



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. lanshcrgi, D. & B. ; N. spilogaster, Peters.) 



a. 9 (V. 143; 0. 43). Intac, E. Ecuador. Mr. Buckley [CI. 



b O (V. 149 ; 0. ?). Pallatanga, E. Ecuador. Mr. Buckley [C. J. 



c-d. 9 (V. 143 ; C. 51) Puerto Caballo. Prof. Peters [P.]'. 



&hgr. (V. 142; C.?). 



e, f. 2 (V. 153, 147 ; - Caracas. 



'C. 47, 49). 



g. S (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. ati-atus, Hallow. ; S. drozii, D. & B.) 



a. 9 (V. 153; C. 47). W. Ecuador. Mr. Eraser [C.]. 



b. 2 (V. 157 ; C. 50). Puerto Oabello. 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. cJ (V. 142 ; C. 62) & $ Cartago, Costa Rica. 



(V. 141, 155, 140 ; C. 50, 53, 52); 

 e. S (V. 130 ; C. 56). Chontales, Nicaragua. 



D. Four (rarely five) lower labials in contact with tlie 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.. sebce, D. & B. ; K fasciatus, Hallow. ; S. col- 

 laris, Jan.) 



a. J (V. 140; C. 65). Chontales, Nicaragua. 



h. 2 (V. 138; C. 60). Guatemala. 0. Salvin, Esq. [C.l. 



c. 5 (V. 136; C. 50). Pacific coast of Guate- O. Salvin, Esq. [C.J. 



mala. 



d. ? (V. 140; C. 51). Yzabal. O. Salvin, Esq. [C.]. 



