Hyla gratiosa % 307 



Eye 1. 07-1. 75 nearer to spiracle (4.0-5.6 mm.) than to tip of snout (6.0-7.0 

 mm.), average 1.3. Nostril i. 0-1.8 nearer eye (2.5-4.0 mm.) than snout (3.5- 

 4.5 mm.). Mouth (3.5-4.5 mm.) usually 1-1.5 larger than internasal space 

 (3.0-4.0 mm.), average 1.075. Mouth contained 1.33-2.4 (average 1.88) in 

 interorbital distance (6.5-8.5 mm.). Internasal space contained in interorbital 

 space 1.62-2.33, average 2.15. 



The dimensions of the largest tadpole are : 



General remarks. In 1921 we secured nothing on the larvae. In 1922 we 

 "found small tadpoles of this form in the pond i mile south of Trader's Hill. 

 They have a striking saddle back spot on the muscular part of the tail and two 

 prominent light areas from each eye to vent." On July 26 "In Anna's Pond 

 found large mature tadpoles of H. gratiosa. They are large creatures. They 

 have considerable greenish in the tail and body." On July 28 "in a pond 

 (open) I mile east of Chesser School mature tadpoles. The tadpoles were in 

 the drifting masses of vegetation." In 1923 (p. 406) we characterized the 

 tadpoles as follows: ''Hyla gratiosa — beautiful green tadpoles, deep crests, 

 young with black saddles on base of the tail, light line from eye to tail." 



These long-tailed, big-eyed, at times flagellum-tipped tadpoles show the 

 myotomes of the tail musculature particularly along the edges of the mus- 

 culature. One captured July 31, 1922, has a forked tail-tip. Tadpoles about 

 half-grown, if viewed from dorsum, look to be a perfect wedge from eye to 

 tail tip. 



LARVAL PERIOD 



In 1922, in April at St. George and Way cross there was only .55 and .69 

 inches rainfall for the whole month, but in May 8.70 and 7.38 inches respec- 

 tively. But at St. George and Waycross 6.05 and 4.12 inches of the month 

 rain was from May 24-31. The transforming frogs of July 25-28 were pre- 

 sumably from this May period or 55-65 days as larvae. If, however, they 

 came from eggs laid in the great June 10-14 choruses which we found on 

 arrival, the period is reduced to 41-48 or 50 days. 



We inchne toward May 24-31 as the period of ovulation because in this 

 pond the tadpoles which transformed July 26-31, 1922, were recorded as half 

 grown in this pond on June 27. June 10 or 12 is too early for these tadpoles, 

 better May 24 onwards or a month for growth to the half way period. This 

 species has to grow to a larger transformation size than any other Hyla in the 



