1893.] EEFIILES XyH BATEACHIAXS PROM BORXEO. 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 B. jerboa. 



3 



3 



b. Series of labial teeth j ^ R. latopalmata. 



2 



c. Series of labial teeth r E. cavitympanum. 



4 



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

 lower lip with a fringe of papillie. 



a. Lower mandible formed of a single piece R. natatrix. 



b. Lower mandible formed of two j^ieces, like the 



upper R. whiteheadi. 



Ehacophorus otiloprl's. (Plate XLIV.) 



Vomerine teeth in two small oblique series close to the inner 

 anterior angle of the choauae, which are exceedingly large. Head 

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

 region roofed over by rugose dermo-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 suout ; 

 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 

 quadrilineatus-xariety of II. leacomystax ; 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. 



From snout to vent 80 millira. 



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



This is a most remarkable form, allied to R. h'ucomijstax but 

 w'ith the cranial dermo-ossitication carried considerably farther, 

 and reproducing pretty nearly the stage reached in the genus 

 Bufo by B. typhonius, in the genus JJyla by 11. lichenata, 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, 



