THE BATSACHIA OF NORTH AMERICA, 



205 



very short The lengths are, begiuning with the shortest, l-d-2-4-3. 

 The number of phalanges taken in order is: 1-2-3-3-2. The epider- 

 mis on the extremities of all the digits is horny. There are no distinct 

 palmar or plantar tubercles. I have not discovered any horny plates 

 on the inner sides of the posterior legs, such as occur in the D. viridcs- 

 ccns during the breeding season. 



The character of the surface of the skin varies according to the sea- 

 son and locality. In a majority of specimens the upper surfaces are 

 smooth, but wrinkled more or less closely. In specimens which have 

 been exposed to drought, the surface becomes rough, with small hard 

 projections. The lower surfaces are always studded with minute horny 

 points so as to be hispid. These become more numerous and prominent 

 in specimens where the dorsal integument is roughened. Lateral folds 

 are very obscure in this species, and can only be traced on the superior 

 part of the sides. Twelve such grooves may be counted, the first and last 

 being opposite the humerus and femur respectively. There is a dis- 

 tinct transverse postgular fold. The digits have thin dermal margins 

 towards the base. The genitalia are very prominent during the breed- 

 ing season, and the orifice is longitudinal, and its edges are marked 

 with transverse wrinkles. Internally there is a large prominent papilla, 

 simulating an intromittent organ, which rests in a fossa, whose poste- 

 rior wall is composed of a series of columnar papillte, which radiate 

 backwards and downwards. The free membrane of the edges of the 

 tail is much reduced, or is even wanting, in the specimens with rough- 

 ened skin. 



2 



r 4 5 



Via. 51. Diemyctyliis torosus. No. 11407. San Francisco; J, f. 

 Measurements of lio. 11577. 



M. 



.170 



,078 



.061 



.026 



Total length 



Length of head aud body 



Length to groin - 



Length to axilla ■ 



Length to cauthus oris 012 



Length to anterior cauthus oculi 005 



Length of fore-leg 027 



Length of cubitus Oil 



Length of manus - 0115 



Length of hind leg 030 



Length of tibia 0085 



Length of pes 0136 



Interorbital width 075 



Greatest width of head 0175 



Depth of tail at middle, with fin 014 



