32 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



Muscular part 1.8-2.2 m depth of tail, average 2.0. Spiracle 1.2-1.9 

 nearer base of hind legs or vent region than the tip of the snout, 

 average 1.6. Spiracle (5.2-6.4 mm.) nearer eye than 1.5-1.8 base of 

 hind legs or vent (9-10.2 mm.), average 1.63. Ej^e equidistant, 

 sometimes nearer to tip of snout than to spiracle. Nostril nearer 

 eye than end of snout. Mouth usually 0.9-1.8 larger than internasal 

 space, average 1 .2. Mouth contained 0.85-2.1 in interorbital distance, 

 average 1.45. Internasal space contained in interorbital space 1.5- 

 2.1, average 1.8. 



The dimensions of the largest tadpole are: 



Mm. . Mm. 



Total length 75. 8 [ Spiracle to vent 14. 2 



Bodj- length 27. 



Body depth 15. 4 



Body width 17. 8 



Tail length 48. 8 



Tail depth 13. 



Ivlujculature of tail 8. 



Spiracle to snout 17. 4 



Spiracle to eye * 8.2 



Eye to snout 8. 



Eye to nostril 4. 2 



Nostril to snout 5. 



Mouth 5. 



Interorbital distance 7.0 



Internasal distance 3.8 



RANA SPHENOCEPHALA (Cope) 



Plate 7, figures 9, 10 



Color description from life {June 23, 1921).— On sides of the body 

 and over the back yellowish olive or oil green, warbler green, or olive 

 green. The back and sides are with conspicuous black spots. On 

 the sides and over the branchial and pectoral regions is a mottling 

 of light brownish vinaceous or pale vinaceous drab, giving a bronzy 

 appearance. The middle of the belly is a solid color pale cinnamon 

 pink, light vinaceous cinnamon, or vinaceous cinnamon. 



TaiL— The muscular part of the tail, upper and lower crests, are 

 with larger black conspicuous spots than the body. The tail has 

 some pale purplish gray, purple gray, pale violet-gray, or violet gray. 



Iris black heavih^ punctate with greenish yellov/ dots; inner rim 

 orange. 



General appearance. — Tadpole large (74.5 mm.), full, and deep 

 bodied. Venter (like that of R. pipiens) not strongly pigmented, so 

 that viscera clearly show through in life or in preserved specimens. 

 Tail medium in length, tip acute. Dorsal crest in width not equal to 

 depth of musculature and extending on to body somewhat ahead of 

 the vertical of the hind legs. Spiracle sinistral, decidedly upward and 

 backward in direction, just below axis of the body. Eye on lateral 

 axis and nearer lateral outline in dorsal aspect than mid dorsal line. 

 Anus dextral, opening on level of the edge of the ventral crest. 

 Spiracular opening round or elliptical. Muciferous crypts more or 

 less distinct in mature tadpoles and sometimes quite distinct in half- 

 grown tadpoles. The dorsal row of either side starting near the dorsal 

 crest goes diagonally forward and outward to join the principal lateral 



