MEXICAN TAILLESS AMPHIBIANS 35 



12. Parotoid glands ovoidal in outline, descending on shoulders; 

 no linear series of enlarged warts on side of body; first and 

 second fingers subequal; subarticular tubercles on fourth toe 

 double; toes one-third webbed; no tarsal fold; two small 

 metatarsal tubercles; skin of upperparts rough, tubercular; 

 underparts coarsely granular; coloration of upperparts brown 

 or brownish black with blotches of darker color on each side of 

 vertebral line; yellowish or whitish lateral stripe from paro- 

 toid gland to thigh, below which is a broad dark-colored 

 lateral band; underparts usually yellowish, rarely spotted with 

 a darker color; interorbital region and upper eyelids with 

 anterior and posterior transverse medially interrupted dark 

 bands; cranial crests high; canthal, preorbital, supraciliary, 

 postorbital, and supratympanic crests distinct in adults; 

 parietal crests vestigial or absent; tympanum smaU but 

 distinct, its diameter slightly more tlian half that of eye; 



head-and-body length, 63 to 71 mm coccifer (p. 41) 



Parotoid glands subtriangular in outline, bicolored, and as large 

 as or larger than upper eyelid; a linear series of large conical 

 warts on side of body; first finger longer than second; subar- 

 ticular tubercles on fourth toe generally single; toes one- 

 third webbed; no tarsal fold; two small metatarsal tubercles; 

 skin of upperparts rough, tubercular, but somewhat smoother 

 in southern specimens; warts often spinose; underparts • 

 coarsely granular; coloration of upperparts quite variable, 

 at one extreme yellowish or light grayish with distinct 

 markings, and at the other extreme with markings subdued 

 or obliterated by a dark slaty or blackish suffusion; prevailing 

 color generally some shade of brown, with linear series of 

 conical warts extending along lateral line from parotoid 

 glands to thighs, above which is a light-colored stripe and 

 below which a dark-colored one; near level of middle of 

 parotoid glands an inverted black chevron bisects light ver- 

 tebral line; back irregularly marbled or blotched with some 

 darker color; limbs cross banded; underparts unicolored or 

 heavily marbled with black; a posterior interorbital trans- 

 verse black band; cranial crests relatively high; canthal 

 ridges distinct; supraciliary crests high, diverging posteri- 

 orly; parietal crests lower than the latter and converging 

 posteriorly; the thick transverse postorbital crest forms an 

 obtuse angle with short supratympanic crest; distinct orbito- 

 tympanal and preorbital crests; interorbital space deeply 

 concave and much broader than upper eyelid; tympanum 

 distinctly outlined, ovoidal in outline, and equal in width to 

 slightly more than half length of orbit; head-and-body 

 length, 60 to 100 mm valliceps (p. 68) 



BUFO ALVARIUS Glrard 



Plate 1, frontispiece; Figure 4 



1859. Bufo alvarius Girard, in Baird, Report on the United States and Mexican 

 Boundary Survey, vol. 2, Reptiles, p. 26, pi. 41, figs. 1-6. — Cope, 1889, U. S. 

 Nat. Mus. Bull. 34, p. 265, fig. 62. — Dickerson, 1906, The frog book, pp. 

 106-108, figs. 107-111, col. pi. 5, fig. 4.— Nieden, 1923, Das Tierreich, Lief. 

 46, Amphibia, Anura I, pp. 75, 129, fig. 182. — Storer, 1925, Univ. California 

 Publ. Zool., vol. 27, pp. 163-167, pi. 12, fig. 32. 



