792 MR. G. A. BOULENGER ON THE [June 20, 



apart on the sacral region; tympanum usually yellow. Some 

 specimens, from Florida, whitish, handsomely marbled with dark 

 brown (S. albus Garm.). Lower parts white, carneous under the 

 thighs ; metatarsal tubercle and tips of inner toes black. 



Iris brassy yellow or golden, veined with black, or with a black 

 transverse bar forming a cross with the vertical pupil. 



Male with an internal vocal sac, opening into the mouth by 

 a slit on each side of the tongue. Inner side of the two or three 

 inner fingers, during the breeding-season, with bands of hlack 

 asperities. 



Mbastteements (in millimetres). cJ . ? . 



From snout to vent 67 73 



Length of head 20 22 



Width of head 28 29 



Diameter of eye 8 8 



Interorbital width 7 9 



From eye to nostril 5*5 6 



„ „ „ end of snout 10 12 



Fore limb 33 36 



Hind limb 72 78 



Tibia 20 22 



Metatarsal tubercle 5 6 



Inner toe (from tubercle) 4 5 



Skeleton. 



Skull strongly ossified, studded with granular asperities above 

 and at the sides. Nasals large, in contact along their entire 

 length, and joining the fronto-parietals, the ethmoid being 

 entirely hidden above ; fronto-parietals broad, expanded into 

 obtusely angular wings at the posterior borders of the orbits ; 

 squamosals with the zygomatic process enlarged, plate-hke, and 

 suturally united with an ascending process of the maxillary. 

 Ethmoid produced forwards, confluent with the ossified nasal 

 capsule, nearly reaching the prsemaxillaries ; vomers moderately 

 large, narrowly separated from each other ; palatines strong ; 

 parasphenoid J_-shaped, not reaching to between the palatines ; 

 pterygoids extending forwards to the palatines, their inner branch 

 joining the parasphenoid. A well-developed columella auris. 

 Teeth with very obtuse, rounded crowns. 



Mandible with the mento-meckelian distinct on the inner side 

 only. 



Hyoid apparatus not unlike that of Pelobates, with detached 

 cornua and a fenestra on each side, but the anterior processes are 

 not turned inwards, or, rather, they may be regarded as absent, 

 the anterior fenestrated portion of the hyoid representing the 

 anterior portion of the eeratohyal cornu fused with the lateral 

 wing \ The postero-lateral process is elongate and the ossified 

 . thyrohyals are in contact at the base. 



1 See Bidewood, P. Z. S. 1897, p. 577. 



