ART. 11 NORTH AMERICAN TADPOLES — WRIGHT 67 



aspect on the lateral outline and in consequence is visible from the 

 venter. Anus dextral, opening at the level of the edge of the ventral 

 crest. Muciferous crypts indistinct. 



Mouth jjarts. — Teeth |. Upper labium fringed with a continuous 

 row of labial teeth; the papillae extend above and inward beyond 

 the end of the upper fringe for about one-third to three-tenths of 

 upper fringe. The end of the second upper labial row is usually 

 even with the end of the upper fringe. The horny beak is contained 

 about 1.8-2.0 times in the upper fringe. The median space between 

 the lateral second upper labial rows of short teeth, 3.25-5 in the 

 length of either lateral row sometimes very narrow (six in lateral 

 row). The inner papillae extend under the third row of lower labial 

 teeth, making at least two rows across the lower labial border. In 

 the lower labial corner there is a heav}^ papillary series sometimes 

 three or four rows wide like H. versicolor or H. femoralis. The lower 

 third labial row is long and is usually about the length of the first 

 or second lower labial rows and longer than the horny beak. The 

 first and second rows are about equal and one and one-half to one 

 and three-fourths greater than the horny beak. This species, like H. 

 versicolor and //. femoralis, has the upper fringe very anguiate at 

 the middle. 



Measurements. — Length of body (10-12 mm.) in tail (16-20 mm.) 

 1.55-2.05, average 1.75. Width (5.0-6.6 mm.) of body in its own 

 length 1.7-2.2, average 1.875. Depth (5.0-7.0 mm.) of body equals 

 body width or slightly greater. Depth of body 1.5-2.2 in body 

 length, average 1.81. Depth (6.0-8.0 mm.) of tail in length of tail 

 2.3-3.3, average 2.8. Muscular part (3.0-4.2 mm.) 1.5-2.33 in 

 depth of tail, average 1.87. Spiracle 1.15-1.75 nearer base of hind 

 legs or vent region (4.0-6.5 mm.) than the tip of the snout (6.5-8.0 

 mm.), average 1.47. Spiracle 1.4-2.2 nearer eye (2.8-3.5 mm.) 

 than base of hind legs or vent, average 1.7. Eye 1.1-1.6 nearer to 

 spiracle (2.8-3.5 mm.) than to snout (4.0-5.0 mm.), average 1.38. 

 Nostril 1.5-2.4 nearer eye (1.2-2.0 mm.) than snout (2.8-3.5 mm.), 

 average 1.8. Mouth (2.0-3.5 mm.) usually equal to internasal 

 space (2.5-3.5 mm.). Mouth contained 1.1-1.8 (average 1.50) in 

 interorbital distance (4.0-5.5 mm.). Internasal space contained in 

 interorbital space 1.33-2.0, average 1.58. 

 The dimensions of the largest tadpole are: 



Mm. 



Total length 32. 



Body length 12. 



Body depth 6. 5 



Body width 6. 



Tail length 20. 



Tail depth 6. 



Masculature of tail 4. 



Spiracle to snout 7. 5 



Mm. 



Spiracle to vent 6. 5 



Spiracle to eye 3. 



Eye to snout 4. 



Eye to nostril 1.2 



Nostril to snout 3. 



Mouth 3. 2 



Interorbital distance 5. 



Internasal distance 3. 5 



