THE BATRACHIA OF NORTH AMERICA. 109 



M. 



Leugthof hiucl foot 0105 



Width between nostrils 005 



Width between eyes 006 



AVidthofhead OIG 



Width of6ole - 008 



Depth of tail at middle 008 



The maimer of describing the color iiattern of this species depends 

 on what we regard as tlie ground. We can assume that the ground 

 color is represented by a dark chocolate-brown, and say that this is 

 closely studded with brownish-white spots of irregular forms and 

 sizes. On the back, limbs, and top and sides of the head the pale 

 spots are so close together as to reduce the browu to a net- work. On 

 the fore-legs the pale spots are larger than anywhere else. The spots 

 are few on the tail, and those chiefly near the base. The inferior sur- 

 faces are dirty light-brown. 



The characters which separate this species from G. paroticus are : 

 The much shorter series of vomeropalatine teeth, the shorter fingers 

 and toes, the less distinct parotoid glands, the shorter and more ob- 

 tuse head, and the coloration. 



No. 14493; one specimen; Port Simpsor Alaska, 1885; Dr. T. H. 

 Streets, U. S. JSTavy. 



CHONDROTUS ATERRIMUS Cope.* 



American Naturalist, 1887, p. 88. 



Amhlijstoma alernmum, Cope, Proc. Ac. Phila., 1867, p. 201; Strauch, Salam., p. 65; 

 Boulenger, Cat. Batr. Grad. Brit. Mus., ed. ii, 1882, p. 49. 



This is a stout species, having a form of head intermediate between 

 that of the G. tenebrosus and A. tigrinum. The dentition is quite pe- 

 culiar, and with the ensemble of its characters refers this species to the 

 immediate neighborhood of the G. tenebrosus. 



Head a broad oval, its greatest width a little over three-quarters the 

 length from end of muzzle to gular fold, and 4.2 in same to groin. The 

 pupil marks three-sevenths the distance from canthus of mouth to ex- 

 ternal nostril. Fissure of orbit equal length from same to nostril and 

 enters 1.66 times width between the latter; it is contained 2.25 times in 

 width between anterior canthi of eyes. Canthus rostralis marked at 

 orbit, terminating very obtusely at nostril. The profile descends steeply 

 from line of latter, not being prolonged, as in G. tenebrosus. Thus from 

 the line connecting middle of inner uares to lip is .75 external interna- 

 rial distance and .6 between anterior canthus of eyes; in G. tenebrosus, 

 same equals internarial width and .75 the distance between eyes. The 

 distances between inner and outer nares are the same; the former are 

 round. The series of palatine teeth commence only opposite the middle 

 of the posterior margin of the internal nares, and describe a slight curve 



. * Plate 24, figs. 4, 5. 



