Occasional Papers of the Museum of Zoology 13 



The color was admirably adapted for concealment, and this, 

 together with the fact that they were more shy than the eastern 

 leopard frog, made them hard to capture. The stomach con- 

 tents examined contained many small toads and a few tadpoles 

 and insects. 



Specimens containing eggs were collected on July 18. 



Rana pretiosa luteivenfris Thompson. 



Common in the Humboldt and Maggie Valleys. 



This species was described from material obtained by the 

 expedition.^ 



R. pretiosa Inteiventris was observed frequently in Mag- 

 gie Creek and Annie Creek, and only occasionally in stagnant 

 pools. In habits the species is much like the eastern R. 

 clamitans. The frogs were always found along the edge of 

 flowing streams or with the head projecting above the vegeta- 

 tion of ponds. They were very shy and disappeared quickly 

 when disturbed, but usually reappeared within a short time in 

 about the same place. 



The stomachs examined contained ants and water beetles. 



Biifo boreas Baird and Girard. 



(PL. IV, I^IG. I.) 



Not uncommon in the Humboldt Valley and James Canyon. 



A comparison of our specimens of B. boreas with the pub- 

 lished descriptions reveals deviations from the latter only in 

 the shape of the ear patch, which is a distinct oval in eight 

 out of the eleven adult toads examined, and in the length of 

 the leg to the heel, which may be less than the distance to the 

 arm insertion by a half inch or may equal the distance to the 

 rear end of the parotids. The color was a dull brownish gray, 

 with a broad light vertebral stripe, a patch of light color beneath 

 the eye, a conspicuous black blotch between the thighs on the: 



sProc. Biol. Soc. Wash., XXVI, 1913, 53-56. 



