22 General Account of the Ithacan Anura. 



KEY TO THE TADPOLES. 



Spiracle sinistral. 



A. Anus median. Tail cloudy translucent, rounded at the end, never twice the length o 



the body, but 2.9 to 5.0 its length. Belly very dark, iridescent. Nasal 

 space in mouth, 1.4 to 2.2. Interorbital space not greater than the 

 mouth. Labial series of teeth f. The lower margin of the labium 

 always free of papillae for a distance almost equal to the width of the 

 mandible. Greatest length, 28 mm Bufo 1. americanus 



B. Anus dextral. Lower lip bordered with papillae. Interorbital space usually greater 



than mouth. Internasal space mainly 0.9 to 1.5 in mouth. Greatest 

 length over 30 mm. 



1. Upper caudal crests extending along the back, almost to between the eyes, which 



are lateral and visible from the ventral as well as the dorsal aspect of the 

 body. Nostrils twice nearer the eye than the snout. Crests with dark 

 blotches of color near the margins. Internasal space in mouth, 0.7 to 1.25. 



a. Tail 2.2 to 3.5 times the length of the body, scarlet or orange vermilion with black 



blotches more prominent near the margins of the crests. Belly conspicu- 

 ously white or very light cream, slightly iridescent. Tail 2.3 to 2.6 longer 

 than deep. Spiracle 1.5 times nearer the base of the hind legs than the 

 snout. Eye nearer the spiracle than the snout. Labial teeth |, the 

 lateral upper row seldom extending beyond the upper fringe of teeth. 

 The second row of labial papilla extending across the lower margin of 

 the labium. Internasal space 0.7 to 1.0 in mouth, never greater than it. 

 Greatest length, 46 mm Hyla versicolor 



b. Tail 1.4 to 2.1 times the length of the body, heavily pigmented with purplish black 



blotches on the outer edges. Belly cream, iridescent. Tail 1.4 to 2.1 longer 

 than deep. Spiracle 2.0 to 2.6 nearer the base of the hind legs than the 

 snout. Eye equidistant between the spiracle and the snout. Labial 

 teeth ^-jn, the lateral upper row always extending beyond the upper 

 fringe, sometimes half of its own length; the lower third row, a little 

 goatee which breaks the continuity of the papillose border on the lower 

 jaw. Internasal space less or greater than the mouth, 0.8 to 1.25. 

 Greatest length 33.5 mm Hyla pickeringii 



2. Upper crest not extending beyond the vertical of the spiracle. Eye dorsal. 



Nostrils nearer (but not twice nearer) the eye than the end of the snout. 

 Mouth usually less than the interorbital distance. Tail, 1.3 to 2.2 times 

 the length of the body. Labial teeth usually f or f, rarely ^ or -J. Second 

 row of papillae seldom extending far inside the lower labium's margin. 



a. Labial teeth j or |, at least one of the lateral upper row extending beyond the 



end of the upper fringe of teeth. Second row of papillae distinct and ex- 

 tending a considerable distance inside the margin of the lower labium. 

 Nostril equidistant between spiracle and snout. Internasal space less 

 than the mouth, 1.1 to 1.9 in it. A cream line along the upper jaw region. 

 Belly with a decided pinkish bronzy iridescence. Greatest length, 47.2 

 mm Rana sylvatica 



b. Labial teeth f, rarely f , the lateral upper row not extending beyond the end 



of the upper fringe. The second row of papillae not extending inside the 

 margin of the lower labium. Dorsal tail crest not reaching the vertical 

 of the spiracle. Extreme lengths, 84 to 145 mm. 



(1) Eye nearer the snout than the spiracle. Labial teeth f , rarely ^-^. Mus- 

 cular part of the tail, 1.35 to 1.95 (never more than 2) in depth of tail. 

 Internasal space in mouth less or greater than it, 0.9 to 1.35. Belly not 

 or very slightly iridescent. 



