9. EXGTSTOITA,— 10. lUCROHTLA. 163 



4. Engystoma ovale. 



Engystoma ovale, Gunth. Cat. p. 51. 

 Rana oralis, ScJmeid. Hist. Aiitph. p. 13 ; Shaw, Zoot. iii. p. 3. 

 Biifo surinamensis. Baud. Rain. pi. .■3:5. f. 2, and liept. viii. p. 184. 



oralis, Daiid. liain. p. 9i*, and liept. riii. p. 187. 



Rana bufonia, Merr. Tent. p. 177. 



Engystoma ovale, Fitz. Neue Classif. Sept. p. 65 ; Dum. ^ Bibr. 



p. 741 ; Steindachn. Verh. zool.-bot. Ges. Wieti, 18G4, p. 285, 



pi. 18. f. 4. 

 O-xyrliyncluis bicolor, (Valenc.) Guerin, Icon. Hejit. pi. 27. f. 2. 

 Microps uuicolor, JFar/l. Si/si. Amph. p. 200. 

 Stenocephaliis microps, Tsckudi, Batv. p. 88. 



Snout pointed, projecting, about twice as long as the diameter of 

 the oye. Fore limb short, longer than its distance from the tip of 

 the snout ; fingers short, first shorter than second. The hind limb 

 being carried forwards along the body, the tibio-tarsal articulation 

 does not reach the shoulder ; toes quite free, with blunt tips and 

 distinct snbarticiilar tubercles ; a very small inner metatarsal 

 tubercle ; no outer tubercle. Skin perfectly smooth : a fold across 

 the head, behind the eyes. Brown above ; lower surfaces lighter, 

 marbled with brown ; a whitish streak along the hinder side of 

 the thighs. Male with, a subgular vocal sac, and the throat black. 



S. America. 



a. 2 . Bogota. 

 h. 2 . America. 

 c~d. S 2 • ? 



5. Engystoma microps. 



Engystoma microps, Giinth. Cat. p. 52. 

 Eno-ystoma microps, Dum. Sf Bihr. p. 744 ; Steindachn. Verh. zool.- 

 bot. Ges. Wien, 1864, p. 285, pi. 15. f. 3. 



Snout very long, pointed, strongly projecting ; eyes very small, 

 one fourth the length of the snout. Fore limb very short, as long 

 as its distance from the tip of the snout ; fingers very short, first 

 shorter than second. Hind limb very stout ; it being carried 

 forwards along the body, the tibio-tarsal articulation reaches the 

 shoulder ; toes quite free, the tips swoUen into regular disks ; first 

 toe very short ; subarticular tubercles indistinct ; a very small, 

 scarcely distinct, inner metatarsal tubercle ; no outer tubercle. 

 Skin ])crfectlv smooth. Dark brown above, more or less dotted with 

 whitish ; light brown beneath, immaculate. 



Brazil ; Guiana. 



a-d. 2 • Demerara Falls. 



10. MICROHYLA. 

 Microhrla, Tsckudi, Batr. p. 71 ; Dum. ^- Bibr. viii. p. 613 ; Giinth, 

 Cat. p. 121 ; Cope, Journ. Ac. Philad. (2) vi. 1867, p. 193. 



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