TROPIDONOTUS. 133 
6. Tropidonotus scaliger. 
Tropidonotus scaliger, Jan, Arch. per la Zool. iii. p. 214 (1865) ; Bouleng. Cat. Sn. i. p. 203. 
Eutema scalaris, Duges, La Naturaleza, i. p. 129, t. 13. fig. 17 (1888) ; Bocourt, Miss. Sc. Mex., 
Rept. p. 768, t. 56. figg. 6 (excl. synonymy). 
Hab. Mexico, Guanajuato (Dugés), Mexico city (Doorman). 
7. Tropidonotus godmani, sp. n. 
Hab. Mexico, Omilteme and Amula in Guerrero (H. H. Smith). 
Scales in seventeen rows, strongly keeled, with the exception of those of the outer- 
most series, which are short, rhombic, smooth or very faintly keeled. Head moderate, 
distinct from neck. The diameter of the eye is equal to its distance from the nostril. 
Anterior frontals subtriangular, truncated in front. Vertical very little shorter than 
occipitals ; one preeocular, which just reaches the upper surface of the head; three 
postoculars. Seven upper labials, of which the third and fourth enter the orbit; five 
lower labials are in contact with the anterior chin-shields, which are shorter than the 
posterior. Temporals 1+2. Ventrals 145, 146, 151; subcaudals 76, 76, 81. 
Brown above, with a yellowish vertebral line, one scale broad; a greenish lateral 
band occupies the sixth and seventh rows of scales; a few small black markings 
occupy the sides of the body, but are generally covered by the overlapping neighbouring 
scales. Lower parts greenish, sometimes finely marbled with blackish. Upper labials 
whitish, with the posterior margin black. 
Seven examples, showing a remarkable agreement in structure and colour, were 
collected at Omilteme and Amula. One of the largest specimens is 24 inches long, of 
which the tail takes 6. The stomach of one contained young mice. 
8. Tropidonotus variabilis. 
Hemigenius variabilis, Dugés, Proc. Am. Phil. Soc. 1888, p. 182 (cum fig.) ; La Naturaleza, 1890, 
p- 403, t. 27. fig. 14; Bocourt, Miss. Sc. Mex., Rept. p. 741, t. 53, figg. 5. 
Hab. Mexico, Guanajuato and Guadalajara (Dugés). 
This species is not isodont, but has the dentition of a Tropidonotus, 
9. Tropidonotus melanogaster. 
Tropidonotus melanogaster, Peters, MB. Ak. Wiss. Berl. 1864, p. 8389; Gtnth. Zool. Record, 1865, 
p- 154; Bouleng. Cat. Sn. i. p. 225. 
Eutenia melanogaster, Cope, Bull. U. S. Nat. Mus. no. 32, p. 73; Bocourt, Miss, Sc. Mex., Rept. 
p. 779, t. 58. fig. 4, t. 55. fig. 3. 
Tropidonotus mesomelanus, Jan, Arch. per la Zool. iii. p. 230 (1865) ; Iconogr. Ophid. xxvii. t. 5. 
fig. 3, and t. 6. fig. 2. ; 
Regina mesomelena, Cope, Bull. U. S. Nat. Mus. no. 32, p. 74; Dugés, La Naturaleza, 1. p. 130 
(1888). : 
Tropidonotus baronis-miilleri, Troschel, in Miill. Reise Mex. iii. p. 610, 
