198 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4rH SER. 
The specimens agree very well with the original description 
of this frog, the principal point of discrepancy being that the 
interorbital space is constantly wider than the upper eyelid. 
As in B. subaspera, there normally is a large gland above the 
axilla. B. holsti is a very much smoother frog than B. suba- 
spera and in it the dermal fold on the external edge of the 
metatarsus rarely extends more than one-third of the distance 
between the toes and the tarsus, while in B. subaspera it usually 
exceeds half this distance. Otherwise I am unable to find any 
structural differences between them. The general smoothness 
of one and wartiness of the other, however, render them readily 
distinguishable, except in a few instances. 
The coloration of B. holsti is usually browner and darker 
than that of B. subaspera, and the dark markings—particularly 
the blackish band from the snout through the eye to the 
shoulder—are more distinct and definite. 
In both frogs the fold from the eye to the shoulder may 
be very distinct, indistinct, or absent. The dorso-lateral fold 
may be broken up into a mere series of small glands hardly 
worthy of the term. The outer metatarsal tubercle usually 
is not developed, but in both forms it is sometimes present as a 
small rounded pad at the base of the fourth toe. The tibio- 
tarsal joints may meet or not, but do not overlap; when turned 
forward they extend to the eye or between the eye and nostril. 
The tibia may be one-half the length of the head and body, 
but often is less. The web is not full, two terminal phalanges 
on the outer and one on the inner side of the fourth toe usually 
being free, except for the dermal margins. The vomerine 
teeth are between and extending behind the choanae. The dia- 
meter of the tympanum may be three times its distance from the 
orbit. There may or may not be a whitish pineal spot. 
The white, pearl-like asperities vary very much in number 
in both frogs. Some specimens have very few anywhere. The 
chest may be entirely smooth. Others have them very 
numerous, so that they are crowded on the warts and over the 
chest and inner surface of the arms and first fingers. Some- 
times they are scattered over the chin and upper surface of the 
head. 
