I 



THE BATRACHIA. OF NORTH AMERICA. 313 



Group IV. PLEURODEM.E.— Frontoi)arietal boues embraciug a foutauelle ; auditory 



apparatus developed; digits free, or slightly webbed; external metatarsals 



bound; terminal phalanges simple; sternum an osseous style, with one or more 



distinct terminal cartilage disks ; tongue entire; cephalic derm free. 



a. Inguinal glands; pupil horizontal; sternal cartilage emarginate or bifurcate. 



Vomerine teeth ; prefrontals well separated ; metatarsal tubercles 



minute; terminal phalanges short Pleurodema Tsch. 



aa. No inguinal glands; pupil horizontal. 



No vomerine teeth; prefrontals entirely separated; terminal pha- 

 langes short Liuperus D. & B. 



aaa. No inguinal glands ; sternal cartilage entire ; pupil erect. 



Vomerine teeth; prefrontals widely separated by the osseous ethmoid; 



terminal phalanges elongate; limbs elongate.. ..iT/y/oWu/frt Bell. 



Group V. Hylodes. — Digits free, or nearly so; external metatarsi bound; terminal 



phalanges with a transverse liinh, which supports dermal disks; sternum without 



style, scutiform, emarginate or bilobed, osseous or cartilaginous. 



1. A frontoparietal font.inelle. 



No vomerine teeth or tarsal spurs; prefrontal bones wide, uniting on 

 the middle line Malachylodes Cope. 



2. No frontoparietal foutauelle. 



a. Prefrontals well separated, rarely the convexities of the inner borders in 

 contact. 

 h. Manubrium cartilag-jr^ous. 



Muzzle and canthus rostralis augulated, projecting ; vomerine teeth; 



digital dilatation ssmall Enhydrobiiis Wagl. 



Muzzle and canthus rostralis contracted, little marked ; vomerine 



teeth ; digital dilatations large Epirhexis Cope. 



hh. Manubrium osseous, styloid. 



Muzzle and canthus rostralis augulated ; no vomerine teeth 



Limnocharis Bell. 



aa. Prefrontals united throughout by close suture, and usually in contact with 

 frontoparietals. 



No vomerine teeth Sijrrho2)hits Cope. 



Vomerine teeth ; abdomen smooth Lilhodijtes Cope. 



No vomerine teeth ; belly areolate Hypodictijon Cope. 



Vomerine teeth ; abdomen areolate Hylodes Fitz. 



Group VI. Cystigxathi. — Frontoparietals and auditory apparatus fully developed ; 

 cephalic derm free; external metatarsi bound, digits free, terminal phalanges 

 simple; sternum a distinctly defined slender osseous style, with distal cartilagi- 

 nous disk ; toes free. 



a. Xiphisternal style emarginate, and with two distal cartilaginous disks. 

 Vomerine teeth wanting ; no tarsal spurs ; inguinal glands 



Buhonias Cope. 



Vomerine teeth present ; no tarsal spurs; inguinal glands 



Edalorhina Esp. 



No parotoid or vomerine teeth; isolated inguinal glands ; two acute 



metatarsal spurs ; pupil horizontal Pahidicola Wagl. 



aa. Xiphisternal style and distal disk undivided. 



No inguinal glands ; pupil horizontal Leptodactylns Fitz. 



Glandular aggregations on the loins ; pupil horizontal 



Cystignathus Wagl. 



No glands ; pupil erect Limnomedusa Cope. 



No glands ; iiupil horizontal ; auditory apparatus atrophied. 

 Tehnatohius Wiegm. 



