184. HOMALOCRANIUM, 225 
17. Homalocranium mestum. 
Homalocranium meestum, Giinth. Ann. & Mag. N. H. (8) xii. 1863, 
. 852; Bocourt, Miss. Sc. Mex., Rept. p. 583, pl. xxxvi. fig. 9 
{ise3); Gtinth, Biol. C.-Am., Rept. p. 152, pl. lii. fig. E (1896). 
Tantilla moesta, Cope, Proc. Ac. Philad, 1866, p. 126. 
Eye nearly half as long as the snout. Rostral small, a little 
broader than deep, scarcely visible from above; internasals not half 
as long as the prefrontals; frontal hexagonal, obtuse-angled in 
front, acute-angled behind, 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 separated from its fellow, the 
symphysial in contact with the anterior chin-shields; four lower 
labials in contact with the anterior chin-shields, which are longer 
than the posterior. Scales in 15 rows. Ventrals 140-148; anal 
divided; subcaudals 55-63. Blackish brown above and below, 
throat, temples, and occiput yellowish white. 
Total length 300 millim. 
Guatemala. 
a. 9 (V. 148; C.?). Peten. O. Salvin, Esq. [C.]. 
(Type.) 
18. Homalocranium vermiforme. 
Lioninia vermiformis, Hallow, Proc. Ac. Philad, 1860, p. 484. 
Tantilla vermiformis, Cope, Proc. Ac. Philad. 1861, p. 74, and Journ. 
Ac. Philad. (2) viii. 1876, p. 145. 
Snout prominent. Rostral large, acute behind; frontal hexa- 
gonal, large, somewhat longer than broad; nostril between two 
nasals; two postoculars; seven upper labials, third and fourth 
entering the eye; symphysial in contact with the anterior chin- 
shields. Scales in 15 rows, Ventrals 122; anal single; sub- 
caudals 26. Whitish above, with numerous small brown spots; 
sometimes a narrow black vertebral line; head brown above, lighter 
on the snout, with a whitish blotch on the occiput; lower parts 
white. 
Total length 130 millim.; tail 18. 
Nicaragua. 
19. Homalocranium breve. . 
Homalocranium breve, Giinth. Biol. C.-Am., Rept. p. 150 (1895), 
Eye not half as long as the snout. Rostral a little broader than 
deep, well visible from above; internasals more than half as long 
as the prefrontals; 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 in contact with the preocular ; 
VOL. III. Q 
