r 



9. £>'GYSTOMA. 161 



Pupil erect. Tongue elliptic, entire, free behind. Vomerine 

 teeth none. A dermal ridge across the palate between the choanae, 

 and another in front of the oesophagus. Tympanum hidden. 

 Fingers and toes free, blunt or dilated at the tips. Outer meta- 

 tarsals imited. Coracoids united by a simple cartilage ; preco- 

 racoids none ; no omosternum ; sternum cartilaginous. Diapo- 

 physes of sacral vertebra moderately dilated. Terminal j^halanges 

 simple. 



America, 



Si/no2:)sis 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 of the eye 2. carolinensc, p. 162. 



Snout pointed, projecting, twice as long as 



the diameter of the eye ; hip with a round 



dark-brown spot 3. elegans, p. 162. 



Snout pointed, projecting, about twice as long 



as tlie diameter of 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., G'imtli. Cat. p. 51. 

 Eng-j stoma rugosum, G'unth. I. c. p. 52. 

 Engystoma ustum, Cope, Pruc. Ac. Philad. 1866, p. 131, & 1871, 

 p. 210; Brocchi, Bulk Soc. Pkilom. (7) i. p. 193, and Miss. Sc. 

 Me.r., Batr. pi. 10. f. 1. 

 Sjstoma ustum, Cope, Journ. Ac. Philad. (2) vi. 1867, p. 194. 

 Engj'stoma mexicanum, Peters, Mon. Berl. Ac. 1869, p. 881. 



Snout acuminate, moderately projecting, not twice as long as the 

 diameter of the eye. Fore limb considerably longer than its distance 

 from the tip of the snout. The hind limb 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, 

 find 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 

 vocal sac ; the throat deep black. 



Mexico. 



