CADUCIBRANCHIATA. 63 



vomerine patches separted by a distinct inter- 

 val, (a) 

 Sphenoidal teeth in two not contiguous groups ;vo- 

 merines often approximated, (d) 

 a. Color cinereous; dorsal band red, rarely 



wanting, (b) 

 a. Color black, dorsal band always wanting, (c) 

 b. Costal furrows 16 or more. 



P. ERYTHRONOTUS. (i). 



b. Costal furrows 14. .P. intermedius. (5) 



c. With irregular gray blotches, costal 



furrows 14 P. glutinosus. (2) 



c. Color uniform black; costal furrows 12. 



P. NIGER. (7) 



d. Costal furrows 13 or less; muzzle truncate; 

 vomerine groups of teeth medially approx- 

 imated, (e) 



d. Costal furrows 14 or more; muzzle round; 

 vomerines few or none, (t) 

 e. Plantar tubercles two in front: spots 

 minute P. Oregonensis. (3 ) 



e. Plantar tubercles none; spots large 



orange .P. croceater. (4) 



f. Dorsal band wanting; dots red or none; 



toes long; body marbled below. 



P. FUSCUS. (6) 



f. Dorsal band yellowish; dots brown; 



toes short; body dirty white below. 



P. ochroph^eus. (8) 



