32 CADUCIBRANCHIATA. 



a. a. wSmaller species, teeth in three series. 

 No, or one indistinct, plantar tubercle. 



External and internal nares equidistant: width ot head 

 4.5 to 5 times in length to groin; length of eyes 2.5 or a 

 little less in width between anterior canthus of same; 

 tooth series transverse ; lead-colored to black, with or 

 without pale or distinct lateral spots . . Jeffersonianum. 



Inner and outer nares equidistant: width ot the long 

 oval head 5.5 to 6 times in length to groin; length eye 

 fissure 1.75 — (to? twice) in width between anterior can- 

 thus of same; tooth series slightly convex; lead-color- 

 ed, uniform platinenum. 



Nares equidistant ; width of head 5 times to groin ; 

 muzzle contracted; eye fissure 1.66 between anterior can- 

 thus of same, once to nostrils; median dental series 

 convex forwards. A broad gray band on vertebral line 

 of tail and bodv, expanding on occiput; sides dark red- 

 dish brown macrodactylum. 



II. Series of teeth extending to external fissure of in- 

 ner nares; lingual plicae radiating from behind; parot- 

 id glands forming a distinct ovoid mass. 



a. Teeth in three series (no canthus rostralis or 



plantar tubercles) fourth toe with three phalanges. 



Nares equidistant, both approximated: median series 



of teeth nearly straight short: width of head 4.5 times to 



groin: eye fissure 1.7 times in width between anterior 



canthus: limbs large, toes short. Uniform brown. 



PAROTICUM. 



III. Series of teeth not extending beyond inner line ot 

 the nares: lingual plicas radiating from behind: no dis- 

 tinct parotid mass. 



