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J 27X m'LLKTiN ;)i. r\iTi;i> statks nationai, miiskkm 



rxlrcniiiy <»rilH' sii|»iintil»il;il. T.\ nipaiiic <lisli disliiict ; \ filirall.v oval 

 in ronii; its liiiiji; (liaiiu-lrr Iwotliiitls tli;it ul tlic oiliil. i'.iioloiil ^^laiul 

 i'loii;;iit(', Willi (»\;il rxticiiiilics; not aii.unliilt' nor (IcscciKliii;^ on lln* 

 sitlcs of lilt' ImmI.v. Dorsal dciiii stiidilcd willi lallicr small round warts. 

 Smlan's of limbs and lower pails cvci \ \\ lu'ic siioii;;l_v ;;iaiinlar. l''irsl, 

 liiiKt'i' :i little lon;;er than s(u;ond. Toes weldted, tlie meinltrane eiiiai'ni- 



me e(»l(lhlo()(le(l vertehrates ( 

 several slroii>ily marked <;eo^fra|diieal siihspeeies wliieli have lieeii le- 

 .uarded as species. That the latter view can not he niaiiitaineil is <'vi- 

 dent IVoni the exist<Miee of a small minority of individuals in wliieh the 

 featiii'es of the resjieetive types are tniiinl to Ite wanting; or miiiLileil, 

 The peisisteiiee of these forms is. however, so evident, that tlies should 

 take distinct rank in our system. Their detiiiitions aic as follows: 



Frontopjirii'lal iTi'sts :iii|ii<i\iiii,iiril, |i:ir,illii, iidI ini'diiriMl : |iii>i(iiliii;il cn-i- Idmi,' ; 



nil Mi|iiat.viMiijiMic (ivnI : IkmiI | in I.:, liim.s Jn |rii;,'lli .'■'. /. l.-uUri. 



l-'niiit(>|i:iiiclal irois jciiall.'l. m.i well ili>l iiiL;iii,>lM il |>iisli lioily on aridiini iCllic 



aliriipt clcvalioii III' tlic iMii|iiil ; |)i.>l()iliilal> Inn;; ; no sii)tial vni|»aiiir ; luaij I..'. 



t" •"> I i nil's /;. /. irnodlinllsli. 



l'r(Hit(>|iariclal nrsts ilivi'r;;.'iil. iml nimli inoilm ril, ami wril ili>l inuniNlii d In liinil : 

 |>i)sti)rliiials sliDit: .sii|iial\ ni|iaiiii- wauling m -liml : luatl I li> I.'. Iiimin m 



'''"K' n /.'./. (I nil ril illiin:. 



Fn.nliiliaiiiial ni'sls (livir;,riii|, ptiKlnrril intn aKimli 'ii'liinii tlic .sIkhI iupsIdi iiilals ; 

 Hii)iial.\ 111 panic w ril ili'\ ilopnl : hrail :!..'» to I liiiii's in liiii;!!! . . . /.'. '. /. ///i'/Moisi/s. 



The /;, /. (ihicriciiiiii.sis the cent lal form from which the olhers radiate. 

 The />'. /. Iciitiiiiiiosiis, as Ihe characteristic type of the Aiist roriparian 

 rej^ioii, has ehaiaeters ni(»st divei';;ent IVmiii (lie others. The peculiar 

 form /,'. I. Jhirlrri of Ihe Norlheasl is coiiliecled with the olliei types hy 

 tho n. I. iroixllHHisii (>[ \\\i' L'ocky .Moiiiitains. Thr l.iller is ihf most 

 dillicnlt to separate IVoni Hi,, eastern ,'.'. /. niiirrindiiis, thoii-h its lyp- 

 ieal represent ;iiives are (piiie iljstiiicl. 



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