452 AMBLYCEPHALIDZ. 
5. Leptognathus brevifacies. 
Tropidodipsas brevifacies, Cope, Proc. Ac. Philad. 1866, p. 127. 
Leptognathus brevifacies, Cope, Proc, Ac. Philad. 1868, p. 108, 
Dipsadomorus fasciatus, Bocourt, Bull. Soc, Philom. (7) viii. 1884, 
. 136. 
Leptoguathus torquatus, Cope, Proc. Amer. Philos, Soc, xxii, 1885, 
p- 172. 
Eye large. Nasal divided ; loreal usually entering the eye; one 
or two proculars ; three postoculars; nine or ten upper labials, 
fourth and fifth entering the eye; two anterior pairs of lower 
labials in contact with each other behind the symphysial; four 
pairs of chin-shields. Scales in 15 rows, vertebrals scarcely 
enlarged. Ventrals 162-171; anal entire; subcaudals 86-89. 
Black, with narrow whitish annuli. 
Total length 153 millim., ; tail 57. 
Yucatan. 
6, Leptognathus andiana. (Prare XXIII, fig. 2.) 
Body 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, shorter than the parietals; nasal divided ; 
loreal as long as deep, bordering the eye; no preocular ; prefrontal 
entering the eye; two postoculars; temporals 2+3,; eight upper 
labials, third and fourth entering the eye; first lower labial in 
contact with its fellow behind the symphysial ; two ‘pairs of chin- 
shields, first as long as broad. Scales in 15 rows, vertebrals 
strongly enlarged, the largest twice as broad as long, many divided 
into two. Ventrals 184; anal entire; subcaudals 82. Yellowish 
above, with interrupted fine black longitudinal lines; large verti- 
cally elliptic black, white-edged blotches on the side extending to 
the vertebral line and alternating with those on the other side; a 
large {)-shaped black marking on the head; lower parts uniform 
hite 
white. 
Total length 255 millim. ; tail 60. 
Ecuador. 
a, Yg.(V. 184; C. 82). Quito, 
7. Leptognathus elegans. (Puave XXIII. fig. 3.) 
Leptognathus mikanii (non Schleg.), Giinth. Biol. C-Am., Rept. 
p. 141 (1895). 
Body strongly compressed. Eye large. Rostral nearly as deep 
as broad, not visible from above; internasals one third the length 
of the preefrontals ; frontal slightly broader than long, as long as its 
distance from the end of the snout, much shorter than the parietals ; 
nasal entire; loreal once and a half as long as deep, bordering the 
eye; a preocular above the loreal; two postoculars; temporals 
