16 



PROCEEDINGS OF THE NATION A.L MUSEUM 



The dimensions of the largest tadpole are; 



Mm. 



Total length 26. 4 



Body length 10. 



Body depth 4.8 



Body width 7. 



Tail length 16. 4 



Tail depth 5. 



Musculature of tail 3. 



Spiracle to snout 



Spiracle to vent 



Spiracle to eye 



Eye to snout 4. 4 



Eye to nostril 



Nostril to snout 



Mouth 2.4 



Interorbital distance 4. 8 



Internasal distance 



SCAPHIOPUS HOLBROOKn (Harlan) 



Plate 6, figure 6 



Color description from life {June 23, 27, 1922). — General appear- 

 ance bronzy. Upper parts brownish drab, benzo brown, vinaceous 

 drab. Upper parts with many close set spots of apricot orange or 

 vinaceous tawny which on the top of upper tail crest become merged 

 into a conspicuous bittersweet orange ridge of color. Throat and 

 gill region with little of the orange vinaceous spots of upper parts. 

 Gills can be seen through the skin. Spots on belly clear yellow green 

 in places. 



Tail. — Muscular part brownish drab, benzo brown, vinaceous drab. 

 Crests translucent. Upper crest with thin edge of dots and inter- 

 lacing lines. This arrangement goes around the tip. Rest of under 

 crest translucent^ — no edging. On the caudal half of lower edge of 

 the muscular part the muscle segments are more or less outlined by 

 the light color making emarginations between the black dots. The 

 same arrangement for the dorsal third of the muscular part of the 

 tail. 



Iris and eye black, small; eyes close together. 



General ay'pearance.—Tsid^oXQ small (28.0 mm."), broad, and large 

 bodied but not deep. Body has from dorsal aspect a Limulus-like 

 appearance. Tail short, tip blunt rounded. Body unlike Bwfo, 

 broader nearer eye than vent. Dorsal crest and ventral crests not 

 deep nor greater than depth of musculature. Dorsal crest extends 

 on to the body to a vertical just ahead of the developing hind legs, 

 is perceptibly nearer hind legs than spiracle. Spiracle sinistral, far 

 below lateral axis, as much or more ventral than lateral, opening 

 mor^ rectangular or slitlike than in our tadpoles in general. Spiracle 

 about on the level of the mouth. Eye on the lateral axis (of tail 

 musculature projected) very dorsal in position. The eyes close 

 together, nearer the mid-dorsal axis than the lateral outline, in fact 

 nearer together than in Bufo. Anus median at the end of the edge 

 of the ventral crest. Muciferous crypts in preserved specim.ens at 

 least indistinct. 



