418 



BB. All head ridges present (supraocular, supratympanic, occipital). 

 C. Parotoid small. 



D. Occipital ridges not prominent; warts not spiny typhonius. 



DD. Occipital ridges prominent; warts spiny coniferus. 



CC, Parotoid enormous marinus. 



Key to Canal Zone Engystomops. 



A. Warts circular; belly lightly marbled with gray; toes webbed at 



base ruthveni. 



A A. Warts linear; belly heavily marbled with black; toes free, .pustulosus. 



Key to Canal Zone Leptodactylus. 



A. Small species; short head; short vomerine teeth; heel to eye; 



dorso-lateral fold; toes not fringed .labialis. 



A A. Very large; short broad head; medium vomerine teeth; heel to 



tympanum; a dorso-lateral fold; toes not fringed pentadactylus. 



AAA. Medium sized; long head; long vomerine teeth; heel to eye or 

 to snout; three dorso-lateral folds on a side; not striped; 



toes fringed holivianus. 



AAAA. Medium sized; long head; long vomerine teeth; heel to snout; 

 two dorsal folds in middle of back; striped; toes not fringed. 



quadrivittatiLS. 



Key to Canal Zone Eleutherodactylus. 



A. Disks of fingers and toes scarcely noticeable, not twice as wide as 

 digit. 

 B. Toes webbed at base. 



C. Quite smooth above; a black face patch; eyes red in life. . .gollmeri. 



CC. Extremely rugose above; uniform blackish; large hufoniformis. 



BB. No web at base of toes. 



C. Rugose above; small; uniform white below polyptychus. 



CC. A marked ) (-shaped wart above; large; marbled below. . . hiporcatus. 

 AA. Disks of at least some fingers twice as wide as digit, noticeable. 

 B. Toes webbed at base; disks only on fingers; belly smooth. 

 C. More rugose above; thighs black behind with white spots; 



snout shorter; web not to more than 3^ length of toes, .fitzingeri. 

 CC. Smoother above; thighs uniform brownish red behind; snout 



longer; web more than 3^ of toes longirostris. 



BB. Toes not webbed at base; disks on fingers and toes. 

 C. Belly rugose; no marked vocal sac; feet rather long. 

 D. Tympanum visible. 

 E. Nearly uniform light gray above; a few black marks on 

 head; sometimes a W-shaped black scapular mark; 

 black in thigh and shin; nearly smooth above; heel to 

 snout; tympanum }>4 eye ockendeni. 



