Batrachians in the British Museum. 405 



the diameter of the eye. Fingers moderate, first much longer 

 than second ; toes slender, not fringed : subarticular tubercles 

 strong; sole smooth, with a small oval inner metatarsal 

 tubercle ; a tarsal fold. The tibio-tarsal articulation reaches 

 midway between the eye and the end of the snout. Skin 

 smooth ; a glandular fold on each side of the back from eye 

 to groin ; another from the eye to the shoulder ; a ventral 

 discoidal fold. Pale brown above ; glandular folds black- 

 edged ; a dark brown triangular blotch on the back of the 

 head, the base between the eyes, the apex between the 

 shoulder; sides of head whitish, with a black canthal streak 

 and three dark brown spots on the lip, the second extending 

 to the eye ; sides of limbs with large dark brown spots; a 

 white dark-edged streak along the back of the thighs ; uni- 

 form white beneath. 



From snout to vent 43 millim. 



A single specimen from Bebedero, Costa Rica, collected 

 by Mr. 0. F. Underwood. 



CORYTHOMANTIS, gen. nov. {Hylidarum). 



Pupil rhomboidal. Tongue subcircular, scarcely free 

 behind, entire. Vomerine teeth. Head a bony casque, with 

 projecting labial borders, formed as in Triprion and Dia- 

 fflena Tympanum distinct. Fingers free, toes webbed, the 

 tips dilated into regular disks. Outer metatarsals united. 



Agrees with 'Triprion and Diaglena in the curious shape of 

 the head, but differs in the absence of teeth on the para- 

 sphenoid. 



Corythomantis Greeningi. (PI. XVII. figs. 3-3 b.) 

 Vomerine teeth forming a transverse series on two strong 

 triangular bony prominences between the posterior borders of 

 the choanse. Head extremely depressed, entirely bony, rough, 

 its posterior border slightly raised and notched in the middle ; 

 forehead concave; canthus rostralis raised, curved ; snout pro- 

 jecting far beyond the mouth, flat beneath ; tympanum half 

 the diameter of the eye. Fingers rather short, disks as large 

 as the tympanum ; toes two-thirds webbed, the disks a little 

 smaller than those of the fingers; subarticular tubercles 

 strong. The tibio-tarsal articulation reaches the posterior 

 border of the eye. Sides of body with closely-set small 

 round tubercles ; belly and lower surface of thighs granulate. 

 Greyish olive above, freckled with darker ; tubercles whitish ; 

 lower parts whitish. No vocal sacs. 

 From snout to vent 78 millim. 



