184, HoMALOCRANIUM. 221 
a. 9 (V.159; 0.44). Duefias, Guatemala. O. Salvin, Esq. [C.]. - 
b. Q (V. 147; C. 49). Guatemala. * P Godman, Esq. 
c. 2 (V.186; C.?). Hacienda Rosa de Dr. Rothschuh [C.]. 
Jericho, Nicaragua. 
(Types of H. janz.) 
9. Homalocranium boulengeri. 
Homalocranium boulengeri, Giinth. Biol. C-Am., Rept. p. 148, 
pl. lii. fig. F (1895). 
Eye not half as long as the snout. ostral a little broader than 
deep; internasals more than half as long as the preefrontals; frontal 
hexagonal, obtuse-angled in front, acute-angled behind, scarcely 
longer than broad, longer than its distance from the end of the 
snout, shorter than the parietals ; nostril between two nasals, the 
posterior of which is in contact with the preocular; two post- 
oculars; temporals 1+1; seven upper labials, third and fourth 
entering the eye; first lower labial in contact with its fellow behind 
the symphysial; four lower labials in contact with the anterior 
chin-shields, which are longer than the posterior. Scales in 15 
rows. Ventrals 161; anal divided; subcaudals 46. Uniform red 
above; head black, with the sides of the snout, a spot on the lip 
behind the eye, and a cross-bar on the occiput yellowish; lower 
parts whitish. 
Total length 240 millim.; tail 40. 
Mexico. 
a. § (V.161; C.46). Huatuzco, Vera Cruz. =F. D. Godman, Esq. 
[P.}. (Type.) 
10. Homalocranium schistosum. 
Homalocranium schistosum, Bocourt, Miss. Sc. Mex., Rept. p. 584, 
pl. xxxvi. fig. 10 (1883) ; Giinth. Biol. C-Am., Rept. p. 152 (1895). 
Tantilla schistosa, Cope, Bull. U.S. Nat. Mus. no. 32, 1887, p. 83. 
Eye not half as long as the snout. Rostral a little broader than 
deep, visible from above ; internasals about half as long as the pre- 
frontals ; frontal hexagonal, obtuse-angled in front, acute-angled 
behind, scarcely longer than broad, a little longer than its distance 
from the end of the snout, shorter than the parietals ; nostril be- 
tween two nasals, the posterior of which is in contact with the 
preocular; two postoculars; temporals 1+1,; seven upper labials, 
third and fourth entering the eye; first lower labial widely sepa- 
rated from its fellow, the symphysial being in contact with the 
anterior chin-shields ; three or four lower labials in contact with 
the anterior chin-shields, which are longer than the posterior. 
Scales in 15 rows. Ventrals 121-135; anal divided; subcaudals 
32-38. Dark brown above, snout and a cross-bar on the occiput 
yellowish ; lower parts yellowish. 
Total length 220 millim. ; tail 42. 
Mexico, Guatemala, Nicaragua. 
