9. ENGYSTOMA. 161 
Pupil erect. Tongue elliptic, entire, free behind. Vomerine 
teeth none. A dermal ridge across the palate between the choane, 
and another in front of the csophagus. Tympanum_ hidden. 
Fingers and toes free, blunt or dilated at the tips. Outer meta- 
tarsals united. Coracoids united by a simple cartilage; preco- 
racoids none; no omosternum; sternum cartilaginous. Diapo- 
physes of sacral vertebra moderately dilated. Terminal phalanges 
simple. 
America. 
Synopsis of the Species. 
I. Two metatarsal tubercles .......... 1. ustum, p. 161. 
II. A single metatarsal tubercle. 
Snout rather obtuse, not twice as long as the 
diameter OL the Gye. ..' soe SH easy es 2. carolinense, p. 162. 
Snout pointed, projecting, twice as long as 
the diameter of the eye; hip with a round 
dare Meuw it SPObr wes 5's ss kc oad ty 3. elegans, p. 162. 
Snout pointed, projecting, about twice as long 
as the diameter cf the eye; a whitish 
streak along the hinder side of the thighs. 4. ovale, p. 163. 
Snout pointed, strongly projecting, four times 
as long as the diameter of the eye ; tips 
of toes swollen into regular disks ...... 5. microps, p. 163. 
1. Engystoma ustum. 
Engystoma carolinense, part., Giinth. Cat. p. 51. 
Engystoma rugosum, Giinth. le. p. 62. 
Engystoma ustum, Cope, Proc. Ac. Philad. 1866, p. 181, & 1871, 
p- 216; Brocchi, Bull. Soc, Philom. (7) i. p. 193, and’ Miss. Se. 
Mex. , Batr. pl. 10: £ U 
Systoma ustum, Cope, Journ. Ac. Philad. (2) vi. 1867, p. 194. 
Engystoma mexicanum, Peters, Mon. Berl. Ac. 1869, - Dp: esl. 
Snout acuminate, moderately projecting, not twice as long as the 
diameter of theeye. Fore limb considerably longer than its distance 
from the tip of the snout. The hind lhmb being carried forwards 
along the body, the tibio-tarsal articulation reaches the shoulder, or 
slightly beyond. Toes quite free, with blunt tips aud distinct sub- 
articular tubercles ; two very prominent metatarsal tubercles, inner 
largest, oval. Skin smooth or with small tubercles on the back; a 
more or less distinct fold across the head, behind the eyes. Olive or 
brownish above ; generally a light band along each side of the body, 
and a narrow vertebral line; limbs lighter, thigh and leg each with 
a broad dark cross band; a white line from angle of mouth to base 
of arm; beneath marbled with brownish. Male with a subgular 
yocal sac; the throat deep black. 
Mexico. 
