Size: Adults, 2 1/3-4 1 / 2 inches. (58-113 mm.). "The resemblance 

 of the adults to Rana boylii is very noticeable, but the size is dis- 

 tinctive — the three specimens on hand measuring 81, 91 and 113 mm. 

 (head and body)." — (Campbell, p. 164). 



Color: (preserved specimens) Dorsum deep grayish olive, a deep 

 olive or even plumbeous black or blackish brown (3). Fore limb and 

 hind limb interspaces grayish olive or citrine drab. Blackish cross 

 bands show in the smallest specimen, one across femur just back of 

 groin and three more before the knee on which is a black spot. The 

 first or second cross band on the tibia may go completely across. 

 Subsequent ones are broken. There are two cross bands on tarsus and 

 two or three on foot. The smallest and intermediate specimens are 

 clear below but the largest (113 mm.) has a very dusky throat and 

 dusky venter in general. 



Structure: Head broader than long, depressed; rounded snout; 

 skin smooth or back with small pustules; curved glandular fold, eye 

 to shoulder. — (Adapted from Boulenger). 



The male has the swollen thumb with a slight tendency toward a 

 diagonal oblique depression across its middle like R. boylii subspecies. 



I. Rana tarahumarae. Adults larger, 1 4/5 or 2 1/3-4 I / 2 inches 

 (45 or 58-113 mm.); tibia shorter, 1.86-2 in length; hind leg 

 shorter, .65-69 in length; throat and lower jaw uniform or cloudy; no 

 outer metatarsal tubercle; no stripe on upper jaw. "Heels not over- 

 lapping." — (Boulenger). 



II. Rana boylii (3 subspecies). Adults smaller, 1 3/5-3 1/3 inches 

 (39 or 40-84 mm.); tibia longer, 1.61-1.87 in length; hind leg longer, 

 .57— .66 in length; throat and lower jaw more or less spotted; outer 

 metatarsal tubercle present; stripe on upper jaw present or obscure. 

 ' 'Heels overlapping." — (Boulenger) . 



Breeding: "The breeding season is evidently after the heavy 

 summer rains which begin in July." — (Campbell. 1931, p. 164). 



The tadpole is quite large 3 1/2-4 inches (88-101 mm.) and the 

 tooth ridges are 5/3^ 4/3. (Preserved tadpoles.) The venter is pig- 

 mented, belly whitish. The venter has a bluish (looks to be a broad 

 blood vessel) median broad band ^from pectoral region to the de- 

 veloping hind legs. This band has 3 or 4 regular pairs of lateral 

 branches. The intestine does not show through the skin. The tail is 

 elongate, its tip pointed (not rounded as in some R. boylii). The entire 

 tail and body, except venter and throat, are heavily spotted with 

 prominent dark spots. B. Campbell found them transforming June 

 18, 1931. 



Notes: On Sept. 22, 1931, Mr. Berry Campbell writes me as 

 follows: "Though I got very few adults, I collected about 10 larvae 

 .... The larvae have never been described. . . . The adults are very 

 much like Rana boylii but the tadpoles, I think, do not show such 

 close relationship. . . ." 



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