456 AMBLYCEPHALID &. 
12. Leptognathus turgida. 
Cochliophagus insquifasciatus (non D. § B.), Cope, Proc. Ac. 
Philad. 1862, p. 347. 
a ame turgida, Cope, Proc. Ac. Philad. 1868, pp. 108 and 
—- ane (non Schleg.), Boettg. Zettschr. ges. Naturw, Wiii. 
1885, p. 288; Peracca, Boll. Mus. Torin. x. 1895, no. 195, p. 21. 
Body feebly compressed. Eye moderate. Rostral broader than 
deep, scarcely visible from above ; internasals two thirds the length 
of the prefrontals ; frontal slightly broader than long, as long as its 
distance from the end of the snout, much shorter than the parietals ; 
nasal divided; loreal once and a half as long as deep, bordering 
the eye; no ‘preeocular, prefrontal entering the eye; two post- 
oculars ; temporals 1+2; seven upper labials, third and fourth 
entering the eye; first lower labial in contact with its fellow behind 
the symphysial; four pairs of chin-shields, anterior a little longer 
than broad. Scales in 15 rows, vertebrals not enlarged. Ventrals 
149-159; anal entire; subcaudals 41-51. Pale brown above, 
with a dorsal series of large transverse black, white-edged spots 
not extending down the sides, and a lateral series of smaller spots— 
the first spot forming a collar, descending to the sides of the neck; 
a cross-shaped black marking on the head, with two large spots on 
each side of it; lower parts white, with an irregular series of small 
black spots on each side. 
Total length 255 millim, ; tail 43. 
apes Matto Grosso. 
gr. (V. 159; C. 44). Asuncion, Paraguay. Dr. J. Bohls [C. 
5. ve v. 152; o} 45). Corumba, Matto Grosso. 8. Moore, Esq. 
13. Leptognathus alternans, 
Leptognathus alternans, Fischer, Jahrb. Hamb. Wiss. Anst. ii, 1885, 
p- 105, pl. iv, fig. 8. 
Body slender, strongly compressed. Eye large. Rostral broader 
than deep, scarcely visible from above; internasals half as long as 
the prefrontals ; frontal as long as broad, as long as its distance 
from the end of the snout, much shorter than the parietals; nasal 
entire; loreal deeper than long, separated from the eye by two 
preoculars ; two postoculars ; temporals 1+ 2; nine upper labials, 
fourth, fifth, and sixth entering the eye; first lower labial in con- 
tact with its fellow behind the symphysial; three pairs of chin- 
shields, anterior a little longer than broad. Scales in 15 rows, 
vertebrals feebly enlarged. Ventrals 197; anal entire; subcaudals 
110. Pale reddish brown above, with two series of elongate oval, 
dark brown, light-edged spots, opposed to each other or alternating, 
narrowly separated on the vertebral line, and descending to the 
sides of the ventrals; neck dark brown above; head pale brown, 
with a large, oval, dark brown, white-edged spot on each parietal 
