438 A Contribution to the Zoblogy of Montana. [July, 
by the enlargement of the posterior part of the prefontal bones, 
which forms quite a tuberosity in adults. These bones slope 
steeply, truncating the muzzle obliquely in profile to the nares; 
the latter then descends vertically to the lip border. The sides 
of the muzzle are flat. The length of the head to the line of the 
postorbital ridges is just one-fourth of the length to the extremity 
of the coccygeal style; it enters the same axis of the B. com- 
pactlis five and one-half times. The parotoid glands are wide 
ovals and are in contact with the postorbital ridges as in B. com- 
pactis. The choanz are rather smaller than the nares. The 
skin is roughened with small tubercles above and below, those 
of the superior surfaces being larger and more spaced. When 
the hinder leg is extended forwards, the end of the astragalus 
reaches the tympanic membrane. The posterior digits are shortly 
webbed at the base. Their extremities, like the e spurs, are capped 
with brown horn, but these sheaths are readily lost in spirits, and 
with them some of the characters of the species. 
In life the color of this species is ashen, marked with three 
pairs of large brown spots on the back. A similar spot crosses 
each eyelid, and there is a pair on the end of the muzzle. There 
are two or three large longitudinal spots on the sides which may 
unite into two bands, one above the other. The spots have 
blackish edges and paler centers with yellow or red tips on the 
tubercles; the ground is brighter round the spots. The limbs 
have similar large spots on their superior surfaces, and the palms 
and soles are yellowish. There are two large spots below the 
eye, and smaller spots on the tips in Sant Below immaculate. 
Length of head and body, m. .040; do. of head, .o10; width 
of head behind rictus ovis, .016; length of fore limb, .020; do 
of hind limb from vent, 048; do. ‘of hind foot, .022. 
This species is one of the handsomest of the nearctic species 
of the genus. 
Bufo ? sp—I have already alluded to this toad as representing 
the B. dipternus on the south side of the Missouri river on the 
plains of Northern Montana. I saw numerous specimens on Dog 
creek, but was unfortunately unable to preserve them on account 
of the want of spirits. The species is small and resembles the 
Spea bombifrons i in its color much more nearly than does the 2. 
dipternus, since it exhibits numerous small spots without margins. 
But it does not have the developed tarsal spurs of the B. dip- 
ternus, and resembles much more nearly the B. lentiginosus. I 
am under the impression that it should be considered a sub- 
species of that widely distributed toad. 
Amblystoma mavortium Baird.—I have already mentioned find- __ 
ing this species in rain pools north of the Missouri, and on the 
