120 OPHIDIA. 
2. Zamenis oaxace. 
Coryphodon constrictor (part.), Dum. & Bibr. Erpét. vii. p. 184. 
Coryphodon testaceus (part.), Giinth. Cat. Col. Sn. p. 108. 
Coryphodon oaxaca, Jan, Elench. sist. Ofid. p. 63. 
Bascanion oaxaca, Bocourt, Miss. Sc. Mex., Rept. p. 701, t. 48. figg. 2, 2 a-d. 
Zamenis oaxace, Boulenger, Cat. Sn. i. p. 386. 
Hab. Mexico, Oaxaca (Mus. Paris). 
3. Zamenis rhombifer. (Tab. XLV.) 
Coryphodon rhombifer, Giinth. P. Z. S. 1860, p. 236. 
Hab. Panama, Chiriqui (Champion).—CotomBiA; E. Perv. 
Body moderately slender; head rather short and high; eye large, two-thirds of the 
length of the snout; rostral shield rather broader than deep, reaching to the upper 
surface of the head. Anterior frontals one-half or one-third the size of posterior ; 
vertical as long or nearly as long as occipitals. Nostril wide ; loreal subquadrangular, 
with the posterior angle produced backwards; preocular single, concave, extending 
to the upper surface of the head, but not reaching the vertical; two postoculars. 
Temporals 2+2 (the two posterior may coalesce into a single shield). Normally 
nine upper labials, the fourth, fifth, and sixth entering the orbit. Scales keeled, in 
seventeen rows, those of the outer series smooth. 
Ventrals 165; anal bifid; subcaudals a. (Esmeraldas.) 
» 100; 7 i 93. (Moyobamba.) 
»  1d7; 95 9 88. (Chiriqui.) 
Upper parts brownish grey, with a series of large, irregularly rhombic, dark brown, 
black-edged spots along the back; they become fainter in large specimens, and only the 
black edges remain ; sides of the body and of the ventral shields marbled with irregular 
black spots. 
An adult specimen is 37 inches long, the tail measuring 12 inches. 
We have figured the typical specimen from Esmeraldas, restoring its tail, and the 
specimen from Chiriqui, which is young. 
4. Zamenis flavigularis. 
Psammophis flavigularis, Hallowell, Proc. Ac. N. Sc. Phil. vi. p. 178 (1852); and in Sitgreave’s 
Exped. Zuni R. p. 181, t. 11 (not good). 
Coryphodon mento-varius, Dum. & Bibr. Erpét. vii. p. 187. 
Bascanium mentovarium, Cope, Proc. Am. Phil. Soc. xviii. p. 271 (1879) ; Bull. U. S. Nat. Mus. 
uo. 82. p. 71; Bocourt, Miss. Sc. Mex., Rept. p. 699, t. 45. figg. 6, 6 a-d. 
Zamenis mentovarius, Boulenger, Cat. Sn. i. p. 389. 
Bascanion suboculare, Cope, Proc. Ac. N. Sc. Phil. xviii. p- 319 (1866). 
Bascanion lineatus, Bocourt, Miss. Sc. Mex., Rept. p. 700, t. 48. fige. 1, 1 a-c. 
Zamenis lineatus, Boulenger, Cat. Sn. i. p. 888. . 
