38 PROCEEDINGS OF THE NATIONAL MUSEUM vol 74 



between these two lateral rows is usually one and one-half times the 

 length of either row. The ends of these lateral rows may or may not 

 extend to the end of the upper fringe. The upper fringe much longer 

 than the horny beak. On lower labium three rows, the first and 

 second about equal in length and about equal to upper fringe of teeth 

 or slightly less and slightly longer than the horny beak. First row 

 may be continuous or interrupted in the middle. The third row quite 

 short for a Ranid tadpole, much shorter than the single row of lower 

 labial papillae, one-fourth shorter than first or second lower labial 

 rows. Labial papillae on side of labium little more than a single 

 row, a few inner papillae usually not extending mesially beyond the 

 end of the second row. 



Hinckley (1882) gives a third small row of teeth in the lower corner 

 of each upper lip ; in 50 or more first season, second season and mature 

 tadpoles, this occurred but once as the figures are. In two other 

 cases, such a row was present, but it was at right or obtuse angles to 

 the first or second rows and might have been a part of one or both of 

 them. Sometimes the upper fringe is entirely absent, present on 

 one side, or the teeth of it may occasionally leave the mouth and be 

 carried back over the forehead. The second row may be missing. 



Measurements. — Length of body (34-49 mm.) 1.56-2.15 in tail 

 (62-97 mm.), average 1.8. Width (25.0-34.4 mm.) of body in its 

 own length 1.1-1.6, average 1.3. Depth (24.4-28.6 mm.) of body 

 1.00-1.19 in body width (25-24.4 mm.), average 1.1. Depth of body 

 1.6-1.73 in length of body (34-49.0 mm.), average 1.66. Depth of 

 tail (20-33 mm.) 2.4-3.5 in length of tail (62-97 mm.), average 2.8. 

 Muscular part (12.5-19 mm.) 1.4-1.9 in depth of tail, average 1.8. 

 Spiracle 1.08-1.44 nearer base of hind legs or vent region (17-24 mm.) 

 than the tip of the snout (23-27.8 mm.), average 1.26. Spiracle 

 1.33-1.75 nearer eye (11.5-14 mm.) than base of hind legs or vent 

 (17.0-24.0 mm.), average 1.55. Eye nearer to tip of snout (9.5-12.8 

 mm.) than to spiracle. Nostril equidistant between snout and eye. 

 Mouth (5.5-8.0 mm.) usually 0.95-1.16 larger than internasal space 

 (4.2-6.5 mm.), average 1.07. Mouth contained 1.3-2.1, average 1.73 

 in interorbital distance. Internasal space 1.75-2.2 in (9.2-14 mm.). 



The dimensions of the largest tadpole are: 



Mm. 

 Spiracle to vent 22. 5 



Mm. 



Total length 142. 



Body length 45.0 



Body depth 38.0 



Body width 34.4 



Tail length 97. 



TaU depth 31.8 



Musculature of tail 17. 2 



Spiracle to snout 26. 8 



Spiracle to eye 12. 8 



Eye to snout 12. 8 



Eye to nostril 6. 4 



Nostril to snout 7. 



Mouth 7.0 



Interorbital distance 11.4 



Internasal distance 4. 6 



