1893.] EEPTILES AS"D BATE.ACHIANS FROM BORNEO. 527 



A. Beak formed of two pieces, an upper and a lower, feebly denticulate, not 



ribbed ; lower lip not fringed. 

 1 



a. Series of labial teeth r ^ E. jerboa. 



3 



3 



b. Series of labial teeth 2 R. latopalmaia. 



2 



3 



8 S 



c. Series of labial teeth r E. cavitympanum, 



4 



B. Beak formed of three or four pieces, toothed, ribbed on its outer surface ; 



lower lip with a fringe of papillae. 



a. Lower mandible formed of a single piece E. natodrix. 



b. Lower mandible formed of two pieces, like the 



upper R. whitehcadi. 



Rhacophoutjs otilophus. (Plate XLIV.) 



Vomerine teeth in two small oblique series close to the inner 

 anterior angle of the choana>, which are exceedingly large. Head 

 much depressed, large, a little broader than long ; supratemporal 

 region roofed over by rugose dernio-ossitication ; frontoparietals 

 rugose ; a strong, spinose, bony crest above the tympanum ; a 

 spine at the angle of the jaws ; snout pointed, a little longer than 

 the diameter of the orbit ; nostrils close to the tip of the snout ; 

 canthus rostralis sharp, loreal region deeply concave ; forehead 

 concave ; interorbital space a little broader than the upper eyelid ; 

 tympanum nearly as large as the eye. Fingers long, with rudi- 

 mentary web, the tips dilated into rather large disks ; toes two- 

 thirds webbed, disks smaller than those of fingers. The tibio-tarsal 

 articulation reaches between the eye and the nostril. Skin of back 

 finely, of belly and lower surface of thighs coarsely granulate ; 

 heel with a small triangular dermal appendage. Pale olive above, 

 with dark grey spots and longitudinal streaks, much as in the 

 quaclrilineatus-\ Aviety of R. leucomystax ; hind limbs with dark 

 cross-bars, which are of an intense black and close together on the 

 concealed surfaces of the hind limb. Male with internal vocal 

 sacs. 



Erom snout to vent 80 niillim. 



A single male specimen from Bougon, N. Borneo {Everett). 



This is a most remarkable form, allied to R. leucomystax but 

 with the cranial dermo-ossification carried considerably farther, 

 and reproducing pretty nearly the stage reached in the genus 

 Bufo by B. tifphonius, in the genus Hyla by H. liehenata, in the 

 genus Nototrema by N. oviferum. 



I am fortunately again able to supplement the description of a 

 new Frog with that of its larva, several specimens at all the middle 

 and later stages of development having been collected by Mr. 

 Everett in the same locality as the adult. 



Length of body once and a half to once and two-thirds its width, 



