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TIIK BATRACIIIA OF NORTH AMERICA. 



313 



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Group IV. rLia'KODKM.i;.— Froiitoparictiil Imhh'h fiiilniiciiiH :i foi't'i'iL'llf ; iuulilory 



appiii-iitus (levi'lopml ; ilif^its free, or slij;lilly wdibed ; oxttniiiil iiictatarsiils 



bound; tt'nniiiiil pliiiliiiiyi's Niiiiple; wtfiiiuni an ossuons styli', with one (ii inoro 



distinct terminal cartilage di^ks; tonj^uc entirt;; cephalic derm free. 



a. Injjninal ghmds; pupil horizontal; sternal cartilage emargiuate or bifurcate. 



Vomerine teeth; prefrontals well separated; metatarsal tiiberehis 



minute; terminal phalanges short I'kiiroihmii 'I'seli. 



un. No inguinal glands; pup 1 horizontal. 



No vomerine teeth; prefrontals entirely separated; terminal pha- 

 langes short LiiipcrtiH 1). & 1'. 



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



Vomerine teeth ; prefrontals widely separated by the osseous ethmoid ; 



terminal phalanges elongate; limbs elongate ITiilorhinti I?ell. 



Group V. Hylodks. — Digits IVee, or nearly so; external metatarsi bonnil ; tirnihiiil 

 phiilanijcH with a traiinn'iHc Ihnb, which supports dermal disks; sternum wit'.iout 

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



1. A frontoparietal fontamdle. 



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

 th(! nsidille line Udhichi/loilrs Cope. 



2. No frontoparietal fontandle. 



a. I'refrontals well separated, rarely the convexities of the inner Itorders in 

 contact. 

 b. Manubrium earti1a;;.'ui)us. 



Muzzle andcantlius rostralis angulated, projecting; vomerine teeUi; 



digital dilatation ssmall Juiln/drohiiis Wagl. 



Muzzle and canthus rostralis contracted, little marked; vomerine 



teeth; digital dilatations large Epirh<xin Cope. 



hh. Manubrium osseous, styloid. 



Muzzle and canthus rostralis angulated ; no vomerine teeth 



I.imnocharis IJell. 



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

 frontoparietals. 



No vomerine teeth Siirrliophits Copo. 



Vomerine teeth; abdomen smooth I.ithodytcs Cope. 



No vomerine teeth ; belly areolato lljumdivfjitiii Cope. 



Vomerine teeth ; abdomen areolate llijlodt'8 Fitz. 



Group VI, CvsTKiNATiii.— Frontoparietals and auditory apparatus fully developed; 

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

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

 nous disk ; toes free, 



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

 Vomerine teeth wanting; no tarsal spurs ; inguinal glands 



niihoiiias Cope. 



Vomerine teeth prestMit; no tarsal si)urs ; inguinal glands 



EdaloiliiiKi Fsp. 



No parotoid or vomerine teeth ; isolated ingu'inal glands ; two acute 



metatarsal spurs; i)upil horizontal Pahidicohi Wagl. 



an. Xii>histerual style and distal disk undivideil. 



No inguinal glands; pui)il horizontal Lvi)todacl!ihi>< Fitz. 



Glandular aggregations on the loins ; i)upil horizontal 



Cjintijinthiin Wagl. 



No glands; pu])il erect l.imiKimidiisa Cope. 



No glands; pupil horizontal; ainlitory ap|)aratns atroi)liit'd. 

 Tclmuloh'nix Wiegm. 



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