420 



Key to Canal Zone Hyla. 



A. Vomerine teeth in two groups forming an arch; fingers J^ webbed; 



grayish green; webs red; medium sized albomarginata. 



AA. Vomerine teeth in two small groups between choanae. 

 B. Fingers free, or with merely a trace of web. 



C. A projecting flap on eyelid; large; crossbarred ceratophrys. 



CC. No projecting flap on eyelid. 



D. Snout short and blunt; tiny; five stripes; toes half webbed. 



microcephala. 

 DD. Snout long and flat; medium sized. 



E. Smooth above; no black spots on thigh and groin rubra. 



EE. Rugose above; black spots on thigh and in groin, .boulengeri. 

 BB. Fingers at least x /i webbed. 

 C. Fingers about }/i webbed. 



D. Small frogs; toes not webbed to disks of III and V; thighs 

 almost without pigment; a network of dark fines 



above underwoodi. 



DD. Medium species; toes webbed to disks of III and IV; 



thighs pigmented; a black band on sides of face phaeota. 



CC. Fingers about Y% webbed; medium species. 



D. Smooth above; brownish, with darker marbling; green 



dots in groin and on hind side of thigh gabbii. 



DD. Warty above; very gaudy marbling vemdosa. 



Key to Canal Zone Agalychnis. 



A. Fingers slightly webbed; toes }£ webbed; large; green, white 



dots on side dacnicolor. 



AA. Fingers J^ webbed; medium sized. 



B. Green with white bars on side; concealed surfaces orange. 



callidryas. 



BB. Green with concealed surfaces orange with black bars calcarifer. 



AAA. - Fingers entirely webbed; green with occasional white warts 



above; concealed surfaces orange; large spurrelli. 



Key to Canal Zone Centrolene. 



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

 flat; bones white; uniform green in life with white spots 

 above; gular sac white; upper eyelid golden; iris silver with 

 dark lines; no humeral hook; in preservative, white with 



sparse chromatophores black fleischmanni. 



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

 ' snout normal; bones green; green above in life; gular sac 

 green; a rudimentary humeral hook, not projecting; in 

 preservative uniform purple above; fingers more webbed . pidveratum. 



