442 MB. G. A. BOtJXENGER ON THE [May 8, 



23. Arthkoleptis ingtjinalis, sp. n. (Plate XXVII. fig. 2.) 



Tongue without conical papilla. Head moderate, as long as 

 broad ; snout rounded ; canthus rostralis obtuse ; loreal region 

 concave ; interorbital space as broad as the upper eyelid ; tym- 

 panum distinct, three-fifths to two-thirds the diameter of the eye. 

 Fingers and toes rather elongate, slender, the tips merely swollen ; 

 subarticular tubercles very prominent ; first finger not extending 

 beyond second ; toes practically free, the rudiment of web being 

 very indistinct ; a rather large, very prominent, oval, compressed 

 inner metatarsal tubercle ; no outer metatarsal tubercle ; no tarsal 

 tubercle. The tibio-tarsal articulation reaches the eye or between 

 the eye and the end of the snout. Skin smooth. Coloration very 

 variable : greyish or brownish above, uniform or spotted or freckled 

 with darker, or with dark symmetrical markings ; a black canthal 

 and temporal streak; a more or less distinct dark spot or short 

 oblique baud on the groin ; limbs with dark spots or bars ; lower 

 parts white, throat usually freckled with brown. Male with an 

 internal vocal sac. 



From suout to vent 30 millim. 



Numerous specimens from the Benito River (G. L. Bates). 



G-ampsosteontx, g. n. 



Pupil vertical. Tongue free and feebly notched behind. 

 Vomerine teeth. Tympanum distinct. Fingers and toes free, the 

 tips slightly swollen ; terminal phalange of all but the inner toe 

 a sharp curved claw, projecting through a slit on the lower surface 

 of the extremity of the toe. Outer metatarsals bound together. 

 Omosternum and sternum with a bony style. 



The projecting, non-retractile bony claw, uncovered with a horny 

 sheath, which arms the toes with the exception of the hallux, is a 

 feature unique, so far, not only among Batrachians but among 

 Vertebrates. The only other instance I know of bone being ex- 

 posed through the skin in Vertebrates higher than Fishes is to be 

 found in the ends of the ribs of Molge (Pleurodeles) waltlii Mich, 

 and Tylototriton andersonii Blgr. 



24. Gampsosteonyx batesi, sp. n. (Plate XXIX.) 



Vomerine teeth in two small round groups between the choana?. 

 Head large, much broader than long : snout broadly rounded, with 

 short canthi and very oblique, slightly concave lores ; nostril 

 equally distant from the eye and the end of the snout ; eye large ; 

 interorbital space as broad as the upper eyelid ; tympauum very 

 distinct, oval, little smaller than the eye. First finger longer than 

 second, nearly as long as third ; subarticular tubercles of fingers 

 and toes feeble ; a small, oval, inner metatarsal tubercle. The tibio- 

 tarsal articulation reaches the eye. Skin smooth and shiny ; a 

 glandular fold above the tympanum. Dark purplish brown above, 

 white beneath ; a black canthal and temporal streak ; a black 

 transverse line between the eyes ; two dark bars on the upper lip, 



