103 



DESCRIPTION OF A NEW FROG FROM SIAM. 



By G. a. Boulengeh, ll.d., d.Sc, f.r.s. 



With a Plate 



AND A Note by the Collector. 



Baua pileata, sp. n. 



Vomerine teeth in two oblique series converging behind, origin- 

 ating on a line with the hinder edge of the choanae. Lower jaw with 

 two fang-like bony prominences in front, in the males. Head, moderate 

 in the females, very large in tiie males, a little broader than long ; in 

 the males, strong swellings are formed on the lower suface ot the 

 mandible and on each side of the occiput by the extraordinary develop- 

 ment of the masseteric and depressor muscles; snout short, obtuse; 

 canthus rostralis obtuse, loreal region oblique; interorbital region little 

 broader than the upper eyelid in females and half-grown males, twice as 

 broad and very convex in full-grown males; in these the frontoparie- 

 tals form a swelling as in I'elohates fascus and Ram plicatella ; behind 

 the interorbital region a large dermal flap in the full-grown males, 

 rounded and completelj' detached behind ; in snaaller males this flap 

 less developed and in females and j''oung it is absent or represented by 

 a faint semicircular fold ; tympanum distinct, f or i the diameter of the 

 eye in females, quite as large as the eye in adult males. Fingers 

 moderate or rather short, blunt, first extending a little beyond second ; 

 toes moderate, nearly entirely webbed, the tips dilated into small disks ; 

 a feeble cutaneous fringe along the outer side of the fifth toe ; sub- 

 articular tubercles moderate ; inner metatarsal tubercle blunt, elongate, 

 ^ to ^ the length of the inner toe ; no outer tubercle ; a feeble tarsal 

 fold. The tibio-tarsal articulation reaches the ej^e ; tibia about ^ the 

 length of head and body, a little shorter than the fore limb and nearly 

 as long as the foot. Skin with irregular, flit glandules on the back 

 and small tubercles on the upper eyelid ; a strong foil from the eye 

 to the shoulder. 



Green, olive, or brown above, young and half-grown often with a 

 strong tinge of red, with darker spots or marblings, or with .lark 

 edges to the dorsal glandules ; a more or less distinct yellowish 

 angular band, dark-edged beliind. between the eyes ; lips with dark 



VOL. II, DEC. l!ll(). 



