side give the digits a prominent sawtoothed appearance; tips of 

 fingers are expanded and truncate, toes less so. 



Voice: This is a cricket-like chirp of one or two notes of an in- 

 stant's duration, possibly followed by a trill of two or three notes. 



Breeding: Development is probably within the egg and during 

 April and May. 



Notes: May 5, 1925. Helotes, Tex. In Helotes Creek Canyon 

 above camp . . . where a side ravine comes in, we were searching for 

 a poinsett's lizard we had seen. . . . About 3-4 feet farther up the 

 side of the canyon was a large, flat, loose stone on a stony slope. I 

 lifted it and a small frog hopped out. I got the impression of a green- 

 ish frog. I dropped the stone quickly to see where the leaping frog 

 went and lost it. Then I lifted the stone again and at first my eye 

 did not espy the second frog. Had it been a Camp's frog it would 

 have leaped. Presently my eye saw a Syrrhophus. It is Marnock's 

 frog. It is bigger than Camp's, but much like it. 



Our second frog was caught May 10 on Marnock's hill, back of 

 the store at 4 p. m. In the morning it rained hard until 1 p. m., then 

 we went to Marnock's Hill. East of the store one-half mile, found on 

 top of the hill a pebbly place with a few flat stones. A banded gecko 

 and Marnock's frog were under a stone. It was moist, black dirt 

 beneath the stone, and it was in a more or less open place with dwarf 

 oaks about. 



June 23, 1930, San Antonio. I left at 8 o'clock for Helotes with 

 Gable and his son, Hugh. They parked their car at a crossing above 

 G. W. Marnock's house. They started up a horseshoe hill I never was 

 on in 1917 or 1925. I suspect this was Marnock's special hill for col- 

 lecting. His house is in the opening of the horseshoe. After we reached 

 the top, we went down toward a glen where there had been seepage, 

 earlier. In this place they had found two Marnock's frogs which they 

 gave to Mr. Parks to send to General Biological Supply. One of these 

 very frogs we received this spring. Their habitat was much the same 

 as those found by us. 



In a recent letter (Feb. 9, 1930) Mr. Walter J. Williams inciden- 

 tally speaks of it thus: "I was surprised to see that you did not ask for 

 Syrrhophus marnockii. I found it rather common near San Marcos 

 and if I were there for a time I believe I could get several specimens 

 for you. I understand several have looked for it here since I left but 

 no one else found it. It is best hunted at night." 



H7 



