44 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



niensis in tbe absence of the longitudinal dermal fold on the side, and of 

 tlie papilltie on the upper surface of the head. In both these res[)ects 

 it agrees with some specimens frjiu Abbeville, S, C. (No. 7005), ah^eady 

 referred to. I do not attiicli much importance to the absence of the lat- 

 eral folds, as distension of the abdomen from any cause would be apt to 

 cause it to disappear. These two characters, however, with the brown 

 color, supplement the three important ones given in the diagnosis, and 

 confirm the propriety of recognizing the species. Nevertheless, the ob- 

 servaiion of other specimens presenting the same features will be neces- 

 sary before the species can be regarded as fully established. 



The head has the wide, fiat form of the other species, witli the very sliori. 

 and broadly rounded muzzle, but these characters are exaggerated. 

 Thus the length from the end of the muzzle to the lines connectii.g the 

 angles or canthus of the mouth enters the greatest width of the head 

 four times and a fraction ; while in the C. allegheniensis it is one-half tlio 

 same measurement of the width of the head, or even a little longer. 

 The shortness of the gape as compared with its width is also indicated 

 by the fact that the canthus oris is below a point anterior to the anterior 

 canthus of the eye in the C.fuscus, while in the G. allegheniensis the angle 

 is below the i)osterior canthus of the latter. The eye is smaller than is 

 usual in the C. allegheniensis, its long diameter entering the interocular 

 space a little over seven times; while in the more abundant species it en- 

 ters five times to nearl}^ six times. The extremity of the maxillary series 

 of teeth corresponds with the canthus of the month. The vomerinos 

 have only half as much length. The inti'rnal nostril is a slit, nearly 

 closed, in line with the series of vomerine teeth at their extremity. I 

 have not found it closed in this way in any specimens of tbe (J. alleghe- 

 niensis. The characteristics of the tongue form one of the strongest 

 characters of this species, Its superior surface is covered with large 

 truncate papillae, so closely placed as to be everywhere in contact. 

 They are onl}" distinguished, as in the human tongue, by bending the 

 surface. Nothing like this is known in the other species. Here the 

 surface of the tongue is marked w^th longitudinal plica?, separated by 

 considerable intervals, which are themselves subdivided b}" smaller and 

 lower plicfc, the general result being an appearance something like tripe. 

 The width between the external nares is half of that between the orbits 

 or the posterior nares. 



The crypts of the skin of the superior surfaces are coarser than in 

 the (7. allegheniensis, especially on the posterior half of t!>.o head. The 

 anterior half of the latter is smooth. No trace of the double i)apillai 

 is to be found on the superior surfaces, but they exist in the arched 

 series round the lower jaw below the lip, as in the other species, but 

 with this difference: the papilhTe one above the other are not round, 

 but short longitudinal keels, so as to be parallel to each other. 



The fingers are entirely free, and the phalanges are, begiiming on the 

 inner side, 2, 2, 3,7.2. The ala on the posterior edge of the u[)per arm i.'s 



