54 Proceedings of the Biological Society of Washington. 



ing back in two oblique patches from the inner edge of the internal 

 nares. Skin roughly tubercular; sides, outer surface of leg and lower 

 surface of foot covered with small pointed granules; lateral folds incon- 

 spicuous; glandular ridge along the jaw, interrupted at the angle of the 

 jaw and at tbe shoulder by a ridge curving behind the tympanum; fold 

 of skin across the chest. Fingers not webbed, first slightly longer than 

 second, palmar tubercle indistinct. Legs massive, length to heel equaling 

 thai of body forward to anterior corner of eye: foot broadly webbed, 

 terminal joint of fourth toe free; small inner metatarsal tubercle, no 

 outer tubercle (PI. Ill, Fig. 2). Color above greyish brown; a few 

 irregular dark spots between lateral folds; a light glandular ridge along 

 the jaw; sides grey, tubercles tipped with light; limits obscurely mottled 

 with dark; under surface whitish, mottled with dark anteriorly, orange 

 yellow ( 171 )* posteriorly. 



Notes on paratypes. — There is little individual variation in the series of 

 forty-seven specimens examined, except in coloration and the length of 

 the hind limb. In the brighter colored specimens the lateral folds are 

 lighter than the ground color. There is occasionally a trace of a dark 

 cheek patch, and the spots on the back may be obscure or distinct and 

 few or many in number. The bright color on the ventral surface varies 

 from a faint yellowish tinge on the feet of the young specimens to orange 

 yellow (141, L56, 161, 171) in adults, and it may be present on the 

 thighs, may extend in a more or less U-shaped blotch on the belly, or 

 may cover the entire ventral surface to the shoulder girdle. 



Description of tadpole. — (No. 43,073, Museum of Natural History, "Uni- 

 versity of Michigan, collected July 10.) Length of body, 34 mm. ; width, 

 22 nini.; length of tail, 67 nun.; height, 13 mm. Nostrils nearer eyes 

 than end of snout, distance between them half the interocular space. 

 Spiraculum sinistral. Anal opening dextral in caudal crest. Legs well 

 developed, with small but distinct tubercle at base of fourth toe. Labial 

 papillae interrupted in center above, series of labial teeth %, second 

 upper series interrupted in middle (PI. Ill, Fig. 3). Color in alcohol 

 brownish grey above, with lateral folds a little lighter; belly greyish 

 white; muscular part of tail yellowish white with small grey spots; caudal 

 crests grey with darker spots. 



Ri marks. — liana pretiosa luteiventris may be readily distinguished from 

 Rana pretiosa by the difference in coloration and the absence of the 

 tubercle at the base of the fourth toe in the mature stage (cf. Figs. I and 

 _'. PI. Til ). Also the palmar tubercle is either lacking or much less dis- 

 tinct than that of the typical form, as shown in Figs. 1 and 2, PI. Ill, and 

 as figured by Dickerson t and Cope.* 



Habitat and habits. — This species was common in the irrigation ditches 

 along Anne Creek, in Anne Creek, in the oxbow ponds in Maggie Canyon, 

 and a few were found in Maggie Creek below the canyon, in Susan Creek 

 and the Valley of the Humboldt River, in Maggie Basin. It is quite 



* Klincksieck et Valette, I lode des Couleurs, Paris. 



TThe Frog Book, Color Plate XVI. 



j Batrachia of North America, Bull. 34, U. S. Nat. Mus., p. 434. 



