448 BOULENGER. 



the mouth; limbs with more or less regular dark cross-bands ; lumbar 

 region and sides of thighs yellow, marbled with black, or black with 

 round yellow spots. Lower parts uniform white or spotted or marbled 

 with blackish. In life the sides of the body and the lower surface of 

 the hind limbs may be bright red. 



Male without vocal sacs, with a strong pad on the inner side of the 

 first finger. 



Nasal bones rather small, widely separated from each other and 

 from the frontoparietals; ethmoid exposed and obtusely pointed in 

 front. 



Habitat. — Western North America, from British Columbia to the 

 mountains of Lower California, up to an altitude of 4000 feet. 



Measurements in Millimeters 



1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 



99999cr'9d^9$99 



From snout to vent 110 106 84 72 72 70 85 63 75 68 118 115 



Head 34 35 27 23 22 25 29 21 23 22 37 34 



Width of head 41 40 30 26 25 27 35 23 28 24 45 42 



Snout 13 12 10 8 8 9 11 7 7.5 7 12 12 



Eye 10 11 8 7 6.5 8 9 7 7.5 7 12 11 



Interorbital width 6 6 3.5 3 3 3 5 3.5 4 4 7 7 



Tympanum 10 8 5 4 5 6 6 4 5 5 10 9 



Fore limb 70 69 55 47 45 45 56 37 46 42 74 68 



1st finger 17 17 13 11 11 9 13 8 10 9 18 17 



2nd " 15 14 11 10 10 8 11 7 8 8 15 14 



3rd " 18 18 16 15 14 13 15 11 12 11 22 20 



4th " 13 12 10 9 8 8 9 7 7 7 14 13 



Hind Hmb 171 174 145 127 125 120 159 105 124 113 190 182 



Tibia 52 52 45 41 40 38 52 34 41 37 60 58 



Foot 59 58 49 43 42 42 52 36 42 39 61 61 



3rd toe 34 32 20 23 22 23 29 20 23 22 33 34 



4th " 50 50 42 36 36 35 46 30 35 33 53 53 



5th " 36 37 30 28 26 25 32 22 25 23 40 39 



1-5. San Francisco. — 6. San Diego. — 7. Tia Juana, San Diego Co. — 8-10. 

 Riverside, Cal. — 10-12. Pacific Region of N. America. 



IL Rana aurora. 



Rana aurora Baird and Gir., Proc. Ac. Philad., 1852, p. 174, and U. S. 

 Explor. E.xped., Herp., p. 18, PI. ii, figs. 1-6 (1858); Stejneg., N.Am. Faun. No. 

 7, pt. II, p. 225 (1893); Dickerson, Frog Book, p. 216, Pis. xiv and lxxxii 



