80 BULLETIN 194, UNITED STATES NATIONAL MUSEUM 



Skin not thick and leathery; a few larger forms but mostly small arboreal 

 (some bromeliad) species, the chief exception being the medium-sized 

 arenicolor, which is largely a rock-loving form rather than arboreal. 

 The lot contains representatives of several "groups" 21 



17. Tympanum concealed; canthus absent or rounded 18 



Tympanum visible, the upper edge concealed under the thick supra- 

 tympanic fold; canthus rostralis distinct 20 



18. Toes fully or alm.ost fully webbed to disks.. 19 



Toes three-fourths webbed; spinules of nuptial callosities larger than in 



other species of this group; some white flecks in anal and posterior 

 femoral region; 49 mm pachyderma (p. 86) 



19. A vocal sac present in males; no outer metatarsal tubercle; no dorsolateral 



fold; 55 mm. (nuptial spines present?) crassa (p. 86) 



Vocal sac absent; a thick dorsolateral fold to middle of body; an outer 

 metatarsal tubercle; 55 mm -_ robustofemora (p. 86) 



20. Sides with brown reticulation enclosing round white or cream spots; 



venter yellow, unpigmented; skin generally smooth; tympanum about 

 one-third eye; toes about one-half webbed; 65 mm._ bistincta (p. 87) 

 Sides without reticulations or round light spots; venter cloudy, gray or 

 gray black; toes two-thirds to three-qtiarters webbed; tympanum 

 about one-half eye diameter; 50 mm robertsorum (p. 87) 



21. Tympanum hidden; legs distinctly barred; no outer metatarsal tubercle. 22 

 Tympanum more or less distinct; if covered with skin its outline dis- 

 cernible; outer metatarsal tubercle present 23 



22. Snout truncate; choanae very large, four or more times size of vomerine 



tooth group; no pollex rudiment; eyelid narrower than interorbital 

 distance; subarticular tubercles of feet all single; anal region dark 

 with light spot above; dark spots on backr skin minutely corrugated; 



heel to tip of snout; 24 mm pinorum (p. 87) 



Choanae small; an indistinct pollex rudiment; eyehd equals interorbital 

 distance; some subarticular tubercles of feet double; one very large dark 

 area from head to rump narrowed on neck; anal region light; 25 

 mm leonard-schultzei (p. 87) 



23. Tympanum large, its diameter equal to distinctly more than half the 



diameter of eye 24 



Tympanum small, diameter one-half (or less) of eye 25 



24. Posterior part of thigh strongly reticulated in brown and yellow; tym- 



panum light; a strong fold from eye along sides; mere vestige of web 

 between fingers; tarsal fold present; very elongate inner metatarsal 



tubercle present; heel to eye; 43 mm beltrani (p. 87) 



Posterior part of thigh brown or black-brown enclosing very small, lighter, 



rounded spots; a narrow white line on upper lip; moderately distinct I* 



tarsal fold; fingers one-fourth or less webbed; heel to tip of snout; 65 

 mm phaeota (p. 88) 



25. Width of eyelid distinctly greater than interorbital distance; an inverted 



V-shaped fold about anal opening; tj'mpanum small, less than one-third 

 eye; tarsal fold represented by a few flat unconnected tubercles; 

 canthus sharp; heel to eye; foot three-fourths webbed; fingers with a 



distinct vestige of web (one-fifth or less) forbesi (p. 88) 



Width of an eyelid less than interorbital distance 26 



26. No trace of web between outer fingers 27 



Outer finger one-fifth to one-half webbed (or a httle more) 29 



