only slightly scalloped; toes blunt, tips slightly expanded; thumb of 

 male enlarged, the swelling having 2 lobes; tympanum small, distinct. 



Voice: No description of the call is recorded. It has internal vocal 

 sacs. 



Breeding: They breed from the latter part of March to the first of 

 May. The egg mass in shallow water toward the margin of streams, is 

 attached to sides of stones in the stream bed, and is like a compact 

 cluster of grapes, the individual eggs on the surface distinct, the jelly 

 firm. The eggs are black and white, with 3 envelopes. The egg is 1/12 

 inch (2.2 mm.), the envelopes 1/10, 1/8, 3/16 inch (2.5, 2.8, 4 

 mm.). (Data from Dr. Storer, 1925). The tadpole is medium, 2 inches 

 (50 mm.), deep olive in color, and with tooth ridges 7/5. After a tad- 

 pole period of 3 to 4 months, they transform from June to September, 

 at 4/5-1 1/5 inches (20-30 mm.). 



Notes: 'This little frog inhabits the slow flowing streams of the 

 coastal areas, and may be found in considerable numbers in the semi- 

 permanent pools, formed as the streams become low at the end of the 

 rainy season." — (Slevin, 1928, p. 139). 



"On the road from San Rafael to Bolinas in Marin County, Cali- 

 fornia, at a point about 6 miles west of San Rafael, four of these 

 little frogs were found near a roadside spring from which a small 

 streamlet of clear water trickled over a bed of stones and gravel. 



"Others were secured at the edge of Lake Merced, San Francisco 

 County, California, in moist, but relatively open places. Here two 

 methods of escape were observed: (1) Diving into the water and hid- 

 ing there under the cover of aquatic vegetation, and (2) jumping into 

 the thickets of land vegetation on the banks above the shore line."— 

 (C. E. Burt and M. D. Burt, Nov. 19, 1929, p. 432). 



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