132 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



set, and forming single longitudinal series; top of head bony; 

 canthus rostralis or preorbital ridge very little elevated, ter- 

 minating posteriorly in an obtuse tuberosity above anterior 

 margin of eye, meeting the opposite one at level of or in front 

 of the external nares, and continuing forward to muzzle as 

 narrow elevated ridge; crenelations on superior labial borders 

 extending inward at least halfway to canthus rostralis; upper 

 labial margin moderately thick, abruptly elevated in front of 

 eye, producing there a sharp angle from which it curves or slopes 

 toward muzzle and tympanum; supratympanic ridge not very 

 sharp; posterior margin of bony casque thick, rugose; inter- 

 orbital space rather concave; tongue not or slightly notched 

 behind; pupil transversely oval when expanded, subquadran- 

 gular when contracted, but never vertical; tympanum oval or 

 circular, two-thirds diameter of eye; fingers free; toes one- 

 half webbed; adhesive disks of fingers and toes much smaller 

 than tympanum; short tarsal fold; upperparts light olive, 



with dark spots Diaglena (p. 137) 



Palatine teeth absent; vomerine teeth in two narrowly separated 

 clusters between choanae; parasphenoid teeth small, closely 

 set, and forming single longitudinal series; top of head bony; 

 canthus rostralis developed as high preorbital ridge, which is 

 continuous or nearly so with the opposite one considerably 

 behind external nares, terminating posteriorly in strong pro- 

 jection above anterior margin of eye, and not continued 

 forward in front of external nares as elevated ridge in case of 

 adults; upper labial margin thin, curved, but not abruptly 

 elevated in front of eye; prominent bony supratympanic ridge; 

 posterior margin of bony casque thin, upturned, and nearly 

 straight; interorbital space deeply concave; tongue subcircular, 

 slightly notched behind; pupil vertical; tympanum oval, one- 

 half diameter of eye; fingers united by vestigial web at base; 

 toes one-half webbed; adhesive disks of fingers and toes 

 smaller than tympanum; indistinct tarsal fold; coloration of 

 upperparts brownish, with darker spots; head with lighter 



spots Triprion (p. 138) 



6. Pupil vertical; vomerine teeth generally present in two oblique 

 clusters between choanae; palatine and parasphenoid teeth 

 absent; tympanum distinct, more than one-half diameter of 

 eye; canthus rostralis rounded; upper labial margin not pro- 

 jecting; tongue entire or slightly notched behind; interorbital 

 space broader than upper eyelid, imperceptibly convex; 

 webbing between fingers and toes variable in extent; adhesive 

 disks of fingers and toes varying from less than half to more 

 than the diameter of the tympanum; subarticular tubercles of 

 fingers and toes distinct; first finger shorter than second; 

 first and second fingers opposable; a projecting rudiment of 

 the pollex; a faint tarsal fold present; outer metatarsals 

 united; diapophyses of sacral vertebrae strongly dilated; 

 mesosternum cartilaginous, posteriorly notched and rounded. 



Phyllomedusa (p. 139) 



Pupil horizontal; tympanum distinct or indistinct 6 



6. Vomerine teeth present; tongue not or slightly notched behind; 

 fingers and toes with adhesive disks, the former free or webbed, 

 the latter always webbed Hyla (p. 147) 



