ABT. 11 NORTH AMERICAN TADPOLES — WRIGHT 47 



length, average 1.84. Depth of tail (16-21 mm.) in length of tail 

 2.9-3.6, average 3.12. Muscular part (8-11 mm.) 1.62-2.0 in depth of 

 tail, average 1.84. Spiracle 1.17-1.33 nearer base of hind legs or vent 

 region (14-17 mm.) than the tip of snout (17-20 mm.), average 1.23. 

 Spiracle to eye (8-11 mm.) 1.42-1.82 nearer eye than spiracle to vent 

 (13.5-20 mm.), average 1.62. Eye 1.0-1.22 nearer to tip of snout 

 (7-9 mm.) than eye to spiracle (8-11 mm.), average 1.16. Nostril 

 1-1.42 nearer eye (4-4.5 mm.) than eye to snout (4.5-5.5 mm.), 

 average 1.20. Mouth (5-5.5 mm.) usually 1-1.37 larger than inter- 

 nasal space (4-5 mm.), average 1.12. Mouth 1.36-1.8 in interorbital 

 space (7-9 mm.), average 1.57. Internasal space (4.5-5 mm.) 

 contained 1.55-1.87 in interorbital space, average 1.74. 

 The dimensions of the largest tadpole are: 



Mm. 



Total length 92. 



Body length 30. 



Body depth 15. 



Body width 18. 



Tail length 63. 



Tail depth 21. 



Musculature of tall 11.0 



Spiracle to snout 20. 



Mm. 



Spiracle to vent 16. 



Spiracle to eye 11. 



Eye to snout 9. 



Eye to nostril 4. 5 



Nostril to snout 5. 5 



Mouth 5. 



Interorbital distance 9. 



Internasal distance 5. 



ACRIS GRYLLUS (LeConte) 



Plate 6, figures 13, 14, 15 



Color description from life (July 5, 1921). — General coloration dark 

 olive buff or old gold or olive lake or sulphine yellow. Belly, espe- 

 cially on sides and on gill region, Ught vinaceous fawn or shell pink or 

 pale salmon color. Belly with ivory yellow or cartridge buff clusters 

 of spots. These clustered spots almost cover the top of the body. 

 The region back of the labial mouth parts has no light vinaceous fawn 

 nor ivory yellow. The clusters of spots become almost continuous 

 and look a patch of french gray or lilac gray on the throat region. 



Tail. — Tip of tail (upper and lower crests) conspicuously black (at 

 times lost). Clusters of ivory yellow or cartridge buff spots on upper 

 crest and upper part of musculature, less frequent on lower crest and 

 lower musculature. These spots somewhat amongst black of tail 

 tip. Tail crests almost transparent, certainly translucent, almost 

 clear of marks except under lens, when the course of the blood vessels 

 are marked by the body color (dark olive buflF, etc.). 



Iris ivory yellow above and below, behind and in front of pupil light 

 coral red and black. Whole of iris more or less prettily marked with 

 black interspersed with the two lighter colors mentioned. 



General appearance. — Tadpole medium (42 mm.), full, and fairly deep 

 bodied. Tail very long, tail tip very acuminate, with black flagellum. 



