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Till-: IIATUACIIIA OF NORTH AMlUilCA. 



191 



There arc no (loriniil appeiulages developed in tbis genus at tbe 

 hreedin}^" season. 



1. Mali^s witli posterior liii'f of the mandible coiiciivo and edentnlons. 



Infciior liiteriil scries of poros iniperfoct or wanting, HnjH'riar nono ; no luln'iclc 

 ill cantiiiis ocnii ; tail mostly roundi-d ; fourtiu'ii costal plica'; a jiillowisli 



(lorsiil band ; belly immacnlato ; size small If. ocliroiilidK, 



II. Males with mandibnlar alveolar mari^in continnons and completely tootb(!d. 



Iiil'crior lateral series of pores well dc^vcloptid, snpciioi' irregular or wantiii,^; a 

 tubercle in caiitluis ocnli ; tail compressed, keeled, and linned; fourtetiii costal 

 plica'; above dark spotted, below niarbb^d ; size medium 1). fnncd. 



I'w o well-develo|)ed lateral seric s of pores ; a marked tubercle in the cantliiis of 

 the eye; tail llattened, linned above, attcMiuate; twelve costal folds.; black 

 above and below ; sizi! larjft; I), nigra. 



DIvSMOGXATHUS OCIIROPILKA Cope. 

 I'roceed. Ac. N'at. Sci. I'liila., ISV.t, l','-2. 



This small species bears a strong reseniblaniie to the Spclerjx.s hi- 

 line(ttu.s Vtvaaw, and, apart from generic characters, may be known from 

 it by the rounded tail, the paler-colored abd()men, and the light bar 

 iVom the eye to the angle of tiie mouth. Its proportions are stouter 

 tiian in Plethodon cincrciis crijtliyonotnH, to which it also bears some re- 

 .send)lanee. 



Tiie costal folds are thirteen, but fourteen if that which is immedi- 

 ately above the groin be counted. The hrst falls immediately into the 

 axilla. This is the chaia(!teristic an-angement in I>.fnsc<i also, while in 

 />. itiiiru the fold above the groin usually extends to it, and is the twelfth, 

 vviiilc; that which corresponds to the first of the species before named 

 I aiisjust in ailvaiuie of the axilla. Though this is typical of />. ni(;i<i 

 occasionally another i)!ica appears above the groin, and the twelfth is 

 .-lightly in front of it. 



The pores in I>. ochroi>h(va are very difUcult to observe. In a few 

 specimens I have seen a few of those of the lov.er .series ; the upper I bc- 

 lii've to be wanting. The gnlar fold is distinct, and another vertical fold 

 coiiiinences behind its extremity, and turning longitudinally, extends 

 more or less distin(!tly to the orbit. As in other species, the derm a<l- 

 lieres closely to the frontal bones and is more or less rugulo.se. The 

 head is oval, with rounded depressed muzzle; its greatest width en- 

 ters the length to the groin .~»'rj times. The commissure of the mouth is 

 .--lightly llexuose. 



The appressed limbs fail to nu-et by four intercostal spaces. The 

 inner «ligits of both feet are short but free, longer than in IMethodon 

 species of similar size; the othei- digits are also longer and more dis- 

 tinct ; proi)orfions, l-l-2-.'5, l-r»-L*-l-;i; only three phalanges in longest 

 t.:es. The tail is quite slender, and oidy compressed at tip; in sonu^ 

 there is a keel above on the distal third, but never any dermal lln. 



The vomerine teeth are very few and small when present ; they are 

 often wanting. Their basal line is on a ridge, which is convex back- 



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