Tree-frog from Dutch New Guinea, 403 



or on a level with the hinder edge of the latter. Head 

 rather strongly depressed, as long as broad or a little 

 broader than long; snont rounded ; canthns rostralis distinct; 

 loreal region feebly concave ; eye as long as or a little shorter 

 than the snout ; interorbital space broader than the upper 

 eyelid; tympanum very distinct, small, one-third to two- 

 fifths the diameter of the eye. Fingers one-third webbed ; 

 no projecting rudiment of pollex ; toes webbed to the disks ; 

 subarticular tubercles well developed ; disks large. The 

 hind limb being carried forwards along the body, the tibio- 

 tarsal articulation reaches the eye or tlie tip of the snout ; 

 tibia a little more or a little less than half the length from 

 snout to vent. Skin smooth above, granular beneath, 

 areolate on the sides ; a strong fold above the ear, but no 

 parotoids. Slate-blue above (in spirit), the sides of the- 

 body and the outer side of the head, foot, and tarsus some- 

 times crimson, with white spots or marblings ; a white streak 

 on the upper lip, at least from below the eye ; a white 

 streak, or white spots, on the lower lip ; a white streak above 

 the vent, another along the inner side of the leg and the 

 outer side of the tarsus ; throat blue or purple, belly white. 

 Male without ossified omosternum, with an external gular 

 vocal sac, and a patch of fine dark brown rugosities on the 

 inner side of the basal part of the inner finger. 



c?. $. 



mm. mm. 



From snout to vent 57 85 



Head 18 24 



Width of head 18 26 



Snout 7 8 



Eye 6 8 



Tympanum 2 3 



Fore limb 33 50 



Hand 18 25 



Disk of third hnger 4 5 



Hind limb 89 130 



Tibia 28 41 



Foot 24 





Four specimens (2 ^ , 2 ? ) from the Angi Lakes 

 (6000 feet) in the Arfak Mountains. A fifth specimen (?) 

 from Mount Koebre (8000 feet) in the same mountains. 

 Presented to the British Museum by the collector, Mr. A. E. 

 Pratt. 



This frog belongs to the group of Ili/la ccerulea, with 

 which I have recently dealt*. In the male secondary 



* Zool. Jahrb., Supi-l. xv. 1, 1912, p. 211. 



