ART. 11 



NORTH AMERICAN TADPOLES — WRIGHT 



43 



The dimensions of the largest tadpole are : 



Mm. 



Total length 99. 



Body length 32. 



Body depth 19. 5 



Body width 23. 



Tail length 67. 



Tail depth 18. 



Musculature of tail 13. 



Spiracle to snout 22. 5 



Mm. 



Spiracle to vent 18. 



Spiracle to eye 12. 



Eye to snout 11.0 



Eje to nostril 5. 5 



Nostril to snout 6. 



Mouth 6.0 



Interorbital distance 9. 



Internasal distance 5. 



RANA ONCA Ck>pe (probably not mature tadpole) 



Plarte 7, figure 3 



Color description from life (August 22, 1925). — General color of upper 

 part of body dull citrine. Back of body in detail is really a back- 

 ground of buffy olive or citrine drab with pale green yellow clusters 

 scattered over it and some black intermixed. The belly is pure white 

 or pale cinnamon pink. The region just back of the labial parts and 

 the side of the head below eye with pale green yellow. Two dark 

 areas over the nostrils and a dark dusky area leading diagonally back 

 from the eye and forward from eye inclosing a sort of pale green yellow 

 area. 



Tail. — General color of upper part of base of musculature of tail, 

 oil yellow. Tail musculature in general with pale green yellow spots. 

 The tail musculature is really with a whole lot of black clusters out- 

 lining cartridge buff areas. These cartridge buff patches strike one 

 as one of the characteristic features of the coloration. Along the top 

 of musculature is considerable pale green yellow and in general the 

 tail has a pale green yellow cast. The upper tail crest wdth clusters 

 of black dots which once in a wliile tend to become reticulated. Lower 

 crest is in its cephahc half or two-thirds free of black clusters. The 

 caudal half or one-third like upper crest. 



Eye. — Iris rim light pinkish cinnamon or light vinaceous fawn 

 The iris rim broken below with a little bit of black. In front and 

 behind pupil is quite a large black patch with a few light vinaceous 

 fawn specks. The upper and lower parts of iris are largely light vina- 

 ceous fawn, vinaceous buff, or light pinkish cinnamon. In these upper 

 and lower areas is a little patch of black. 



General appearance. — Tadpole medium (42 mm.), of the R. clamitans 

 type. Venter less pigmented than R. clamitans, but intestine does 

 not show through the skin except in little area ahead of vent. Belly 

 somewhat transverse^ corrugated. Tail elongate, tip rounded. 

 Dorsal crest or ventral crest not as wide as the widest musculature, 

 extending on dorsum ahead of vertical of hind legs (buds) and almost 

 halfway to the vertical of the spiracle. Spiracle sinistral, directed 

 obliquely and decidedly upward, visible from dorsal aspect. Spi- 



