398 



Diagnosis. — Centrolene without humeral hooks, no vomerine teeth; tym- 

 panum a'most aborted; nostri's raised, prominently; bones white; color in life 

 white with a dorsal green network. 



Description. — Tongue circular; head broader than long, semicircular as seen 

 from above save for projection made by nostrils; eyes directed forward, their 

 diameter greater than their distance from tip of snout; canthus rostralis 

 rounded but distinct; lores concave; nostrils protuberant, causing snout to 

 overhang; interorbital space twice as wide as upper eyelid; tympanum barely 

 visible, directed upward, }4 the diameter of eye; fingers with disks wider than 

 tympanum, truncate; first finger longer than second; web on about Yi of outer 

 fingers, to penultimate phalanx of 3 and 4; inner fingers webbed at base; toes 

 webbed to just short of disks of 3 and 5, not quite to penultimate phalanx of 

 4; a single weak inner metatarsal tubercle; heel reaches to beyond snout; smooth 

 above, belly and thighs rugose ; in life white, a narrow green dorsal stripe, green 

 vermiculations on dorsal surface and on shin, thigh unpigmented, white be- 

 neath, iris golden; in preservative white, a few faint dark chroma tophores 

 where green was in life; length 21 mm., width of head 8; arm 13, leg 39 mm. 



Y aviation. — A paratype (M. C. Z. no. 16004) from the same 

 locality is practically identical. 



Remarks. — Manuel Valerio and I collected these two speci- 

 mens the nights of Jan. 15-16, 1929. 



Its relationships may best be shown by a key to the species 

 of this group known to me from Panama and Costa Rica, four 

 in all, all of which I have seen in the field. 



A. Tympanum completely absent; no vomerine teeth; snout very flat; 

 bones white; uniform green in fife with white spots above; gular 

 sac white; upper eyelid golden; iris silver with dark fines; no humeral 

 hook; in preservative, white with sparse chromatophores black. 



fleischmanni. 

 AA. Tympanum tiny; no vomerine teeth; nostrils raised, prominent; 

 bones white; green dorsal stripe and chain markings in life above; 

 gular sac white; iris golden; no humeral hook, in preservative 

 white with few dark chromatophores in vermiculations .... valerioi. 

 AAA. Tympanum distinct; vomerine teeth present in 6 out of 13; snout 

 normal; bones green; green above in life; gular sac green; a rudi- 

 mentary humeral hook, not projecting; in preservative uniform 



purple above; fingers more webbed pulveratvm. 



AAAA. Tympanum distinct; vomerine teeth present in 32 out of 34; snout 

 normal; bones green; green above in life with black dots; a white 

 line around upper jaw; gular sac green; iris black with gold lines; 

 a well developed humeral hook in males, and in some females; 

 in preservative purple above usually (36 out of 41) with black dots; 

 . fingers less w ebbed prosoblepon. 



In view of the resemblances between -prosoblepon and pulvera- 

 tum as against fleischmanni and valerioi, and of the uncertain 



