THE BATRACHIA OF NORTH AMEKIoA. 275 



Besides the peculiarities of the bead crests and metatarsal shovels, 

 this species differs from most of the other North American species iu 

 having the belly spotted. 



No. 11927; 7 specimens; northern boundary United States, Mon- 

 tana; 1874; Dr. E. Coues. 



Of the above specimens four are adult or nearly so, and three are 

 half grown. 



BUFO COGNATUS Say. 



Long's Expedition to the Rocky Monutains, ii, 1823, p. 190; Holbr. 

 N. A. Herp., v. 184-2, p. 21, R. v. ; Bd., & Gird., Marcy's Report, 

 1853, p. 242, PI. 11; Report U. S. Pac. R. R. Surv., x, Whipple's 

 Report, p. 44, PI. xxvi. 



Bufo dipteynus Cope, American Naturalist, xiii, p. 437 ; Bouleuger, Cat. Brit. 

 Mus., 1882, p. 308. 



Head short, one-fifth the total, measured over the dorsal convexity' ; 

 wide, and with muzzle descending steeiily. The descent commences 

 between the anterior part of the orbits, sloping to opposite the nares, 

 below which it retreats a little within the perpendicular to the upper 

 lip. The entire prefrontal region to a point which measures the ante- 

 rior third of the orbit projects as a flat boss or protuberance. The 

 superciliary ridges of the frontoparietal bones originate from the poste- 

 rior side of this, and diverge rapidly, passing by a regular curve or a 

 very open angle into the postfrontal ridge. At the point of junction 

 there is on the inner side an angular tuberosity, which rei^resents the 

 continuation of the superciliary ridge. There is no disposition to the 

 connection of these angles across the middle line or the filling up of the 

 included groove, as is seen in B. hemiopUrys, B. lentiginosus woodhousi, 

 etc. The prefontal boss forms an elevation along the front of the orbit, 

 but not a distinct crest. Supratym panic crest represented by an angle 

 only. Membranum tympani a vertical oval, quite distinct, its long- 

 diameter one-half that of the orbit, sometimes one third. Owing to the 

 elevated form of the muzzle, the nostril marks a point half way between 

 its summit and the edge of the upper lip, and the eye-fissure runs ob- 

 liquely downwards and forwards. 



The parotoid glands are short and wide, generally a short oval in 

 form, at other times subtriangular. The dorsal integument is covered 

 with very numerous closely placed small tubercles, which continue, with 

 diminished dimensions, on the sides and lower surfaces everywhere. 

 No large glands intermixed. First finger a little longer than second. 

 Toes webbed, the web reaching the middle of the fourth (first) pha- 

 lange. Sole wide, width at second toe inclusive, one-half of length 

 from between metatarsal tubercles. The latter are large, the internal 

 extensively free and presenting a wide cutting edge. The external is 

 larger than usual and wide, with a free cutting edge. Tiie subarticular 

 tubercles are small. On the fourth toe they are sometimes double. 



