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2.S2 nrLLirriN :u, iinitkd states national miskiim. 



Tlio (siiitliiis losliiili.s not iiiiirkcd, the mnzzh' (lesct'iidiii^- very steeply 

 from the anterior iin^lcs of the orbits, sliorler than tln^ elevnted perpen- 

 (licuhir extremity. Frontal ridges thickened, frecpiei.tly jmrtially iillin<'- 

 the median groove, higher than eyelids, and rising steeply backwards, 

 where they terminate in two short convergent tuberosities, with inte 

 rior crenations. Occiput generally raised above the nape; postocular 

 ridge e<pially developed, sending a small angle to the anterior aeumi 

 nate extremity of the ])arotoids. Elevation of cranium at parietal tuber- 

 cle equal to length of same from the same point. Eyes large; tympa- 

 num distinct; half eye; parotoid narrow, long,acuminate at both ends. 

 Elbow to anterior margin of orbit ; heel to end of muzzle. Skin every- 

 where with numerous small tubercles ; soles rough; toes half webbed, 

 as in the other subspecies. The internal metatarsal tubeicle is dis- 

 tincitly larger, /. c, wider, than in the other subsjx'cies, almost ecpialing 

 that of the II. vognatim. The external tuber<!le is also larger than in 

 the other forms, but it never posset^^ses a free cutting edge as it does in 

 the />'. coipKitus. T!ie relative shortness of the head is expressed by the 

 measurenuMit, one-tilth the length (f the head an«l body. This (-harac- 

 ter is, however, not constant. Thus in the typical si)e('imens of the spe- 

 cies (No. 2032, Canadian River) the head enters t.GfJ times into the length. 

 The same is true of Nos. 14.'">2G a.jd 10195. In Nos. 4185 and 2(!t(> the 

 head enters the length 4.5 times. In young si)ecimens, as is usual, the 

 s;:ecific characters are not well marked, and the head is one-foiiith the 

 length. This peculiarity is retained in a specimen, (No. 14,5.{S) from 

 Saint Thomas, Nev., which is 3 inches in length. An excei)tional state 

 of affairs is seen in two large specimens (No. 2(;.JI) from tlui head of the 

 Loup F"'ork liiver, Nebraska. The head is one lifth thc^ total length, 

 and the supraorbital crests are parallel, as in typi<;al specinu^ns; but 

 the crests are well separated by a deep gutter behind, whose bottom is 

 not raised above the nape in the usual manner. 



Brown above, with pale vertebral line and three pairs of deep-brown 

 medium-sized si)ots, with paler centers. Sides and lii)s witii small 

 brown spots. Femur and tibia with one iiulistin(!t brown crossbar 

 each. r>elow uuilbrm yellow. The thoracic region is sometimes black 

 speckled. 



This is tlie lloclcy Mountain species, as />. cixjnafus is the si)ecies of 

 the plains. Its range does not appear to extend beyond the boundaries 

 of the United States. Its transition to the It. I. amcricanns is easily 

 perceived in seven specimens collected at Pike's Peak by John Yarrow. 

 One of these is a true li. L woodhousei, while the other six vau not be 

 separated from the B. I. amcriatnus. Dr. Ilallowell described a toad 

 under the name of Ji. (hr.saUs in S'tgreaves' report on the expedition to 

 Ziini and the Colorado liiver, p. 142, IM. !!>. There is nothing in the de- 

 S(;ription nor in the tlgure to enable ns to ascertain what species or sub- 

 si>ecies is represented. The evidence is as much in favor of the speci- 

 men having been a H. I. amrrii'<i)ins as a />. /. woodhoiiHci,, and no lo- 



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