BUFO. 245 
toes half-webbed ; two metatarsal tubercles, of which the inner is somewhat compressed 
and pointed, covered with horn; a tarsal fold. Brownish, marbled with darker ; lower 
parts whitish. 
Distance of vent from snout eee ee eee) «68 millim, 
” ” metatarsal joint . . . . . . 68 ,, 
» » end of fourth toe . .... . 90 ,, 
I have seen only one specimen of this form, a female from Ciudad. Ifit isa distinct 
species, B. mexicanus comes very close to B. spinulosus (=B. halophilus), in which the 
size of the tympanum is subject to considerable variation. It is also closely allied to 
B. compactilis, but has the metatarsal tubercle much less dilated and somewhat pointed. 
4. Bufo monksiz. 
Bufo monksie, Cope, Proc. Am. Phil. Soc. xviii. p. 263 (1879). 
Hab. Muxico, Guanajuato (Duges *). 
Crown of the head without projecting ridges; canthus rostralis sharp, loreal region 
vertical ; snout vertically truncated in front. Tympanum concealed ; parotoid a wide 
oval, rather large. Upper parts tubercular, lower parts granular. First and second 
fingers equal in length. Toes half-webbed; two metatarsal tubercles, small but 
prominent. Blackish-brown above, with a few small ashy spots; blackish spots on 
the sides, belly, throat, and limbs. (After Cope.) 
Length of body . . . . 2... 85 millim. 
» hindlimb . . .. .. 42, 
> hind foot . .). 2. . . ww. eee 20C—*="»=. 
This species is not well established ; it seems to have been named from a single young 
individual, which very probably was only the immature state of one of the other members 
of the genus, perhaps of one provided with cranial crests in the adult stage, like B. simus. 
5. Bufo compactilis. 
Bufo compactilis, Wiegm. Isis, 1838, p. 661; Peters, MB. Ak. Wiss. Berlin, 1863, p. 80; 1878, 
p. 624; Bouleng. Batr. Sal. p. 302; Cope, Bull. U. S. Nat. Mus. no. 32, p. 10 (1887) ; 
Dugés, Nat. Mex. (2) i. p. 140 (1888) ; ii. p. 482 (1896). 
Anaxyrus melancholicus, Tschudi, Fauna Peruana, Herpet. p. 78, t. 11. fig. 5 (bad; fide Peters). 
? Bufo speciosus, Girard, Proc. Ac. N. Sc. Philad. 1854, p. 86; U.S. & Mex. Bound, Surv. ii. p. 26, 
t. 40. figg. 5-10 f. | 
Bufo anomalus, Giinth. Batr. Sal. p. 57 (fide Peters). 
Bufo levifrons, Brocchi, Bull. Soc. Philom. (7) i. p. 187; Miss. Sc. Mex., Batr. p. 70, t. 6. figg. 1-2. 
* In a list of Mexican toads kindly supplied to me by Dr. Dugés, no mention is made of this species. He 
complains that Cope did not always give the localities correctly of the species sent to him. 
+ Considered distinct by Garman, Bull. Essex Inst. xix. 1888, p. 136. 
BIOL, CENTR.-AMER., Batr., February 1901. *32 
