34 



FROGS. 



the young come out into the open shallows or rest at the edges of 

 the ponds in the thick mats of vegetation. If the season has been 

 very rainy and the mortality consequently low, a region may have 

 almost a plague of small frogs. Then temporary ditches, holes, and 

 transient diggings are filled with these creatures migrating from the 

 water over the land, and these constitute the so-called rain of frogs. 

 This shows the apparent ease with which young transformed leopard 

 frogs can be captured at such rare occasions with pitfalls, but ordi- 

 narily the operation is less easy. If the pond about which the frogs are 

 transforming have a heavy growth of vegetation the frogs prove 



Ondeatrable Speoles: 

 Siramp cricket fro? 

 Peeper 



Narrow-mouthed toad 

 Cricket frog 

 Carolina tree frog 

 Pacific tree frog 

 Tree toad 



Possible Speoted: 

 Spadefoot toad 

 Common toad 

 Wood frog 

 Mink frog. 



Desirable Speotaa: 

 Southern leopard fi^og 

 Western bullfrog 

 Yellow-legged frog 

 Western frog 

 Pickerel frog 

 Leopard frog 

 Green frog 

 Southern bullfrog 

 Bullfrog 



Lenith In Inohaa 



I t.S t 8.6 a S.9 4 «.5 » 6.S 6 e.8 t 



Fig. 2. — Transformation and adult sizes of frogs. Length of continuous line equals the transforma- 

 tion size. Length of continuous and broken lines gives adult size. Adult size determined by largest 

 adult in author's collection. 



difficult of capture and are quickly lost in the weeds; therefore, the 

 sure method is to seine the swampy area or pond just before the final 

 stage is reached. At transformation a young leopard frog is, on the 

 average, 1 inch long, the range of size being 0.75 to 1.25 inches. 

 (See fig. 2 and Pis. XXI, fig. 4, and XXII, fig. 6.) 



The southern leopard frog transforms during the last of June and in 

 July. The transformed frogs range from 0.75 to 1 inch in length, 

 the average being seven-eighths of an inch. (See fig. 2 and PI. 

 XXII, fig. 5.) 



The pickerel-frog tadpoles may begin to transform the last week 

 in July, but by far the greater number of larvae transform in August. 

 Occasionally some tadpoles do not transform until September 1 or 

 rarely until October 1. The length at transformation averages 1 

 inch, and the range of size is 0.75 to 1.1 inches. What has been said 



