AET. 11 NORTH AMERICAN TADPOLES — WRIGHT 55 



The dimensions of the largest tadpole are: 



Mm. 



Total length 33. 



Body length 11. 



Body depth 6. 2 



Body width 8. 



Tail length 22. 



Tail depth 7. 



Musculature of tail 3. 5 



Spiracle to snout 8. 



Mm. 



Spiracle to vent 4. 



Spiracle to eye 3. 5 



Eye to snout 3. 5 



Eye to nostril 1. 5 



Nostril to snout 3. 



Mouth 2. 5 



Interorbital distance 4. 



Internasal distance 2. 



HYLA GRATIOSA LeConte 



Plate 9, figures 9, 10, 11 



Color description from life (June 23, 27, August 21, 1922). — They 

 have considerable greenish, greenish yellow or yellowish in the tail 

 and body and are beautiful tadpoles. Halfgrown tadpoles have a 

 striking black saddle spot on the back of the muscular part of the 

 tail and two prominent light areas from each eye to the vent. 



On the side, a patch just ahead of developing hind legs light greenish 

 yellow. Black stripe from between the eye, along the base of the 

 upper crest on either side half way to tip of the tail. Light area 

 beneath this black area and around nostril, over eye, along side to 

 base of muscular part of the tail ivory yellow, tilleul buff, or pale 

 pinkish buff. Another short line of the same color at the very base 

 of the upper crest and above the black stripe. Muscular part of the 

 tail and crest yellowish citrine, light yellowish olive, mignonette 

 green or courge green. Belly pale vinaceous pink. Either side of gill 

 region congo pink, throat clear. Lower lip like muscular tail, yellow- 

 ish citrine or courge green. 



Iris vinaceous pink. 



General appearance. — Tadpole medium (50 mm.) largest of Hylid 

 tadpoles of the eastern United States. Tail long. Tip acuminate, 

 with flagellum. Dorsal and ventral crests about equal, either depth 

 equal to the tail musculature. Dorsal crest extending on bodj^ to a 

 vertical about half way between the spiracle and the eye. Spiracle 

 sinistral, far below lateral axis, directed upward and backward. Eye 

 on lateral axis, in dorsal aspect in the lateral outline and in conse- 

 quence visible from the venter. Anus dextral, on a level with the 

 lower edge of the ventral crest. Muciferous crypts indistinct. 



Mouth parts. — Teeth -|. Upper labium fringed with row of teeth; 

 the papillae extend above and inward beyond the end of this fringe 

 two-sevenths to one-fourth (usually at least one-fourth) of the length 

 of the fringe. The end of the second row about even with the end 

 of the fringe. Sometimes the ends unite. The horny beak contained 

 in the length of the upper fringe L5-L75 times. Median space 



