ABT. 11 



NORTH AMERICAN TADPOIiES— WRIGHT 37 



0.8-1.3 in body depth, average 1.02. Muscular part (9-11 mm.) of 

 tail in its own tail depth 1.45-2.0, average 1.72. Spiracle 0.86-1.2 

 nearer vent than snout, average 1.0 — i. e., about equidistant in gen- 

 eral. Spiracle to snout (17-22 mm.) and spiracle to vent or base of 

 hind legs (17-23 mm.). Spiracle to eye (8-12 mm.) in eye to snout 

 (8-11 mm.) 0.85-1.2, average 0.99 — i. e., eye to snout and spiracle 

 to eye usually equidistant. Nostril to eye (4.0-6.0 mm.) equal the 

 distance from nostril to snout (3.5-6.0 mm.). Mouth (3.0-7.0 mm.) 

 usually 1.0-1.5 greater than the internasal space (3.0-6.5 mm.), 

 average 1.2. Mouth contained 1.1-2.0 (average 1.46) in interorbital 

 distance (5.0-10 mm.). Internasal space contained in interorbital 

 space 1.4-2.0, average 1.75. 

 The dimensions of the largest tadpole are : 



Mm. 



Spiracle to vent 23. 



Spiracle to eye 11.6 



Eye to snout 10. 



Eye to nostril 6. 



Nostril to snout 6. 



Mouth 6. 5 



Interorbital distance 10. 



Internasal distance 5. 



Mm. 



Total length 95. 



Body length 41. 5 



Body depth 17. 



Body width 17. 



Tail length 53. 5 



Tail depth 16. 



Musculature of tail 11.0 



Spiracle to snout 21. 



RANA CATESBEIANA Shaw 



Plate 8, figures 7, 8, 9 



Color description from life {not Ridgway). — Background of back olive 

 green, closely overlaid with fine yellow dots. Back conspicuously 

 marked with dark spots, which become scanty on the slightly (bronzy) 

 iridescent sides. Eye bronze. Venter is straw or maize yellow, with 

 a few greenish spots toward the sides and sometimes in the region of 

 the throat. It is not a distinct marbling, as in the green frog. Tail 

 considerably lighter than back and quite regularly covered with 

 small black spots (almost entirely lacking on the lower crest), some of 

 which are dumb-bell shaped. The fine yellow dots are assembled in 

 small groups. 



General appearance. — Tadpole very large (145 mm.), round, and 

 deep bodied. Some rarely reach 170 mm. Tail elongate, tip obtuse. 

 Dorsal crest not as wide as musculature, extending forward on body 

 slightly beyond the vertical of the buds of the hind legs or sometimes 

 rarely to midway between these buds and the spiracle. Spiracle sin- 

 istral, just visible from dorsal aspect, directed backward and obliquely 

 upward. Spiracle and its opening just below lateral axis of the mus- 

 culature. F,ye well above the lateral axis, but in dorsal aspect nearer 

 the lateral outline than the mid dorsal axis. Anus dextral, opening on 

 level with edge of ventral crest. 



Mouth parts. — Teeth -f or ^. The second upper row one-fourth to 

 two-sevenths of the upper fringe in length. The median space 



