T. 11 NORTH AMERICAN TADPOLES — WRIGHT 49 



The dimensions of the largest tadpole are: 



Mm. 



Spiracle to vent 5. 



Spiracle to eye 5. 2 



Eye to snout 4 2 



Eye to nostril 2. 2 



Nostril to snout 2. 4 



Mouth ___ .__ 2.0 



Interorbital distance 4. 



Internasal distance 2. 6 



Mm. 



Total length 42. 2 



Body length 13. 



Body depth 6. 6 



Body width 8. 2 



Tail length 29. 2 



Tail depth 7. 



Musculature of tail 4. 



Spiracle to snout 10. 



« PSEUD ACRIS from Hilton and BuflTalo. New York 



Plate 6, figure 17 



Color description from life {June 12, 1923). — In general it is quite 

 black, and bronzy in the belly and sides of the belly. The body in 

 particular is black brown (3) or fuscous. Greenish yellow or olive 

 yellow or citron yellow finely^ dots the entire upper parts. Ai'ea below 

 the eye \vith dark spots. Belly solid vinaceous tawny or one of the 

 three yellows above. Lower side of the embryonic hind legs clear 

 while dorsum of them is with black dots. 



Tail. — Blackish brown (3) or fuscous; lower edge of muscular part 

 free of dots, once in a while a few dots in special areas. The dark 

 color is densest just above the lower clear margin and appears as a 

 longitudinal band. At base of muscular part there is a slight sug- 

 gestion of a short light line along the middle of the side for a very 

 short distance (as in E.femoralis, where better developed). On base 

 of the musculature of the tail just where the dorsal crest joins the 

 body are two or three saddle spots, greenish yellow, citron j^ellow or 

 olive yellow. These spots are made up of a collection of dots which 

 are more scattered along the dorsum toward the tip of the tail mus- 

 culature. Dorsal crest is with elongate fleckings. The fleckings on 

 ventral crest less frequent. 



Eye blackish brown (3) or fuscous with vinaceous tawny or one of 

 the three yellows of the body color. 



General appearance. — Tadpole quite small (23 mm.), full, and deep 

 bodied. Tail quite long, tip acute or acuminate. The dorsal and 

 ventral crests about equal. The dorsal crest as deep as the tail mus- 

 culature and extending on to the body to the vertical of the spiracle. 

 Spiracle sinistral, directed almost straight backward, only slightly 

 upward, far below the lateral axis near venter, the opening plainly 

 visible, ellipitical or round. Eye on the lateral axis, in dorsal aspect 

 on the lateral outline and consequently visible from the venter. Anus 

 dextral, opening on a level with lower edge of the ventral crest. 

 Muciferous crypts not distinct. 



Mouth parts. — Teeth -f. Upper labium fringed with a continuous 

 row of labial teeth: The papillae extend above and inward beyond 

 the end of the labial fringe for about one-fourth of the length of the 

 6359—29 4 



