60 DR. J. ROUX ON THE TOADS [Jan. 16, 



This is tlie largest species of tlie genus. The diagnosis given 

 by Boiilenger in 1891 was drawn up from a male specimen from 

 Mt. Dulit, Borneo. Since then the collection of the British 

 Museum has been increased by several specimens, especially 

 females, which I have had the privilege to study. As is often 

 the case with Bufo, in this species the female individuals are 

 notably larger than the males. The distinctive characters 

 indicated by Boulenger are generally very well mai-ked in the 

 female. The head is broader in comparison with the length. 

 The canthus rostralis is well marked. The loreal region is 

 nearly vertical and shows a slight depression in the upper part. 

 The interoi'bital space, twice as broad as the upper eyelid, is very 

 distinctly concave, as well as the part of the head situated near 

 the parotoids. The tympanum is very distinct ; it is suboval, 

 vertically elongated, and half as long as the eye. The parotoids 

 are well marked, pj^riform, and begin immediately behind the eyes. 



As to the limbs, we have noticed individual variations in the 

 length, especially in the hind limbs. The fore limb is relatively 

 long : the fingers, webbed only at the base, are bordered by the 

 membrane, and the distal part is subtiiangularly enlarged ; this 

 peculiarity is more appreciable in the fingers than in the toes. 

 The hind limbs of most of the individuals observed are longer 

 than in the type specimen. The hind limb being carried forward 

 along the body, the tibio-tarsal articulation reaches sometimes 

 the tympanum, sometimes the eye. The toes are generally short, 

 entirely webbed, except the three distal phalanges of the fourth 

 toe, which are free. The subarticular tubercles are veiy well 

 developed, as well as the two metatarsal tubercles. The outer 

 tubercle is twice as large as the inner. I have noticed the 

 presence of a very distinct tarsal fold. 



The coloration of the individuals is worthy of detailed descrip- 

 tion owing to the marked differences between males and females. 



The type specimen, a male, figured by Boulenger, is uniformly 

 brown with some indistinct spots on the limbs ; the throat is 

 black. Two other male specimens show the same coloration, but 

 two male specimens from La was, Brunei, are somewhat difi'erent. 

 The body shows, besides the dark brown, some light brown 

 markings, which form indistinct coarse vermiculations. The limbs 

 are yellowish brown, and present also lighter and darker parts 

 more or less distributed in transverse bands. 



The females labelled ''Sarawak," one of which is figured on 

 PI. II. fig. 1, are distinctly bicolor (yellow and black). The ground 

 is black with small vermiculations or round yellow spots (in 

 the latter case especially on the sides of the body). The head, 

 the back, and the limbs show also these vermiculations. The 

 spots are a little broader on the anterior part and on the sides of 

 the head. The lower pai't of the body and of the limbs is 

 generally dirty gre}^ or uniform yellowish. The border of the 

 lower lip often shows yellow spots. The inferior part of the feet 

 is brown. The females have generally smaller and less numerous 



