118 



PROCEEDINGS OF THE ACADEMY OF 



is, in eight specimens examined, nearly round, while it is always a long oral 

 in the two other Desraognathi ; finally the only male does not possess the 

 black pigment coat of the testes, always present in the others, though as in 

 them the vas deferens is black. The body is stouter, and the width of the 

 head enters the length to the groin less than five times ; in the others always 

 more ; this is also expressed by the existence of only twelve costal plicffi, and 

 the fact that the appressed limbs are only separated by 2^- intercostal spaces. 



The postorbitnl plicte are not strongly marked. The mucous pores are well 

 developed, and the two lateral series are often distinct in alcoholic specimens 

 by their white color ; when they become dry they are difficult to observe. 

 There are two rather distinct gular series within the mandibular rami on each 

 side, and one on each side extending inwards and forwards from the gular 

 plica. The superior lateral series extends from the orbit to near the end of 

 the tail ; the inferior turn round the humeri to each side the pectoral region. 



The proportions of the fingers are as in D. f u sea ; they are entirely free. 

 The eyes are prominent, with thick, opake palpebrae. A tubercle occupies the 

 anterior angle, which, after an examination of that in D. f u s c a, is a dis- 

 memberment of the superior eyelid. 



The coloration is uniform in about twenty specimens examined. It is sim- 

 ple, viz., uniform black above and below, except the muzzle from between the 

 ejes, the lower jaw, the end of the tail aud the soles of the feet, which are 

 brown. 



Measurements of 3923. 



Inche.'". 



Length (axial) from end muzzle to orbit .... -29 



" " " canthus oris "55 



" " " axilla 122 



•' " " groin 3-23 



" " " end vent 3'76 



" " " " tail 6-96 



" of fore limb 69 



" " foot -26 



" of hind limb 1-02 



" " foot -47 



Width " " (sole) -27 



" between eyes in front -3 



" at canthusoris -65 



" of body -75 



" " at sacrum -oi 



Habits, etc. — This creature is aquatic ; but after the fashion of the D. f u s c a 

 it occurs only in shallow stony brooks. It is, so far as known, confined to the 

 Alleghany Mountain ranges from Pennsylvania southwards. It is abundant 

 in the streams of the rocky ravines and cold springs in the remotest depths of 

 the forest, where its retreat is cool and dark. It seeks concealment under 

 loose stones and slabs of slate with great activity, and is not easily caught. 

 Its habitat does not seem to be shared by any species but the D. f u s c a ; the 

 Gyrinophilus p o r p h y r i t i c u s, the other characteristic Alleghany species, 

 haunting standing springs and bogs where stones are not so numerous. Green 

 described it from Pennsylvania, but Baird who is familiar with the Alleghany 

 fauna of our State, says he has not observed it near Carlisle. Nor have I 

 met with it north of Virginia, where- it is common. Besides Green's type, and 

 specimens from near the Kanawha River in S. W. Virginia, in the Academy of 

 Mus. ; the Smithsonian contains the following; 



No. 3886, 2 specimens, Georgia, Dr. Jones. 

 " 3923, 4 " Abbevile, S. Ca., ? ? 



^2 " Giles Co., Va., E. D. Cope. 



* [May, 



