122 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



inner metatarsal tubercle slightly larger than outer one; large sub- 

 articular tubercles; small supernumerary tubercles on plantar surface 

 of foot; ball-like apical disks on fingers; first finger shorter than second; 

 no vomerine teeth; tongue subpyriform in outline, indistinctly notched 

 behind; abdomen and under surface of thighs coarsely areolate. 



Some individual variation in the general color pattern was observed 

 in the small series of specimens examined. The darker markings are 

 much more conspicuous on some than on others, and the ground color 

 varies from olive-gray to reddish brown. Some of the specimens have 

 a light-colored lumbar gland with wavy or zigzag dark streaks. The 

 others have the lumbar gland largely black wdth branching light 

 streaks or with Hght centers. A surprising degree of variation exists 

 in the relative measurements of the body, tympanum, and eye. Four 

 specimens, one of which is from Guerrero (U.S.N.M. No. 47012), two 

 from Nayarit (A.M.N.H. Nos. 12552-53), and one from Puebla 

 (A.M.N.H. No. 13867) measure, respectively, as follows: Head-and- 

 body length, 26.8, 22.4, 25.2, and 26 mm.; transverse diameter of 

 tympanum, 1.3, 0.9, 1.2, and 1 mm.; transverse diameter of eye, 3.1, 

 2.9, 3, and 3.7 mm.; anterior edge of eye to nostril, 2.8, 2.3, 2.5, and 

 2.6 mm. 



Examination of specimens in the British Museum of Natural His- 

 tory by Dr. E. R. Dunn disclosed three additional records for this frog. 

 These locahties are: Guanajuato (No. 1898. 7. 19. 10); Tancitaro in 

 Guerrero (Nos. 1914. 1. 28. 176-180); and Chilpancingo in Guerrero 

 (No. 1906. 6. 1. 1899). 



The single known species may be recognized by the folloAving com- 

 bination of characters: Coloration of upperparts brownish, grayish, 

 or olive gray, spotted or splotched with some darker color or with 

 black; a dark triangular interorbital spot sometimes present; snout 

 in front of transverse interorbital light line rarely light colored; lip 

 border spotted with brown or green; lumbar gland coextensive with 

 an oval partly brown or partly black spot, with two or three white 

 dots, or with hght background and zigzag dark streaks; fore and hind 

 limbs with brown or black cross bands; a conspicuous light-colored 

 spot on anterior surface of upper end of thigh; remainder of thigh 

 broadly marbled with brown and white; coloration of underparts uni- 

 form white, or spotted with black, or brownish with obscure hght 

 stipphng; canthus rostralis rounded; snout subacuminate and rounded; 

 loreal region subvertical ; tympanum vertically oval or circular, about 

 one-third diameter of eye ; diameter of eye a little more than or equiv- 

 lent to its distance from nostril; body slender; tongue entire or indis- 

 tinctly notched behind; maxillary teeth present; no vomerine teeth; 

 sacral diapophysis not widened; skin of upperparts fairly smooth, but 

 with scattered rugosities and small tubercles; skin of abdomen smooth 

 or faintly granulated; fore Umb slender; first finger slightly shorter 



