272 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ne 



That the Ziini toads have a biannual breeding regime is indicated 

 by the formation of a chorus July 29, 1957, in a pond where large 

 larvae were already present. Choruses often were heard after the 

 initial summer rains, suggesting that perhaps summer and spring 

 peaks of precipitation initiate breeding. Gravid females were found 

 at two such choruses, but amplexed pahs were not seen. Thornton 

 (1960, p. 181) found previously marked females of B. woodhousei 

 in amplexus twice in the same breeding season at Austin, Texas. 

 Bragg (1941, p. 112) stated that B. woodhousei breeds more or less 

 independently of rain at Las Vegas, New Mexico. 



Juveniles, previously characterized (Gehlbach, 1956, p. 365), were 

 often in evidence during the day in riparian and oak-mahogany 

 associations. Eight collected July 4, 1959, at 7100 feet, along with 

 the transforming larvae mentioned above, measure 25-34 (x 31.2) mm. 

 snout-vent. Adults were distinctly crepuscular or, on warm nights, 

 nocturnal above the grasslands. They were not as common near 

 arroyos in the Plains Life Belt as in more mesic situations at higher 

 elevations. Their opportunistic feeding habits are indicated by speci- 

 mens with stomachs containing only Phyllophaga or Eleodes species 

 when these beetles were abundant. It is noteworthy that the latter 

 tenebrionid genus is thought to be distasteful to many predators 

 (T. Eisner, inlitt.). 



Locality records: 



MCKINLEY CO.: Thoreau (MCZ 32813*); 5.5 mi. S. Thoreau (CU 6312); 6 

 mi. S. Thoreau (CU 5765, 5767, 6332); 7 mi. S. Thoreau (CU 6337); 16 mi. S. 

 Gallup (CU 6313); 14 mi. N. and 7 mi. E. Gallup (UCM 6544-49); 4 mi. W. 

 Page (CU 6334); Ramah Reservoir (CU 6311); 5 mi. SW. Ramah (UMMZ 

 123133); Upper Nutria (UMMZ 123134); Ft. Wingate (USNM 14395, MVZ 

 9342-48*); Valencia co.: 8 mi. SE. Paxton (UMMZ 86604); Grants (MVZ 

 57640*); Mt. Sedgwick USNM 54363) ; 8 mi. SE. Thoreau (UMMZ 120298-99, 

 120307). 



Hyla arenicolor Cope 



The taxonomic status of canyon tree frogs from the Zunis is being 

 studied elsewhere; certain observations on adult size and metachrosis, 

 nevertheless, seem worthy of record here. Canyon tree frogs exhibit 

 considerable color-pattern variation (Stebbins, 1951, p. 315). Zuni 

 specimens were spotted usually with greenish or dusky, Uchen-Uke 

 markings, but when exposed to sunlight, they often became a uniform 

 dirty cream or grayish white. The skin of such exposed individuals 

 was noticeably more pustulose than in recently captured specimens 

 found in dark crevices or cracks between rocks. The ground color 

 of most H. arenicolor was yellow cream, tan, or light reddish brown, 

 closely approximating the sandstone substrate on which they were 

 restine-. 



