266 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iie 



mately 50 mm. snout-vent, in an exposed, rapidly evaporating pool, 

 transformed during a 59-day observation period in 1959. Another 

 group of similar size located under a ledge in a nearby pool showed 

 little reduction of larval features during this time. Thus, A. tigrinum 

 in the Zunis may remain larval and become paedogenic if provided 

 with a relatively permanent aquatic environment but can transform 

 under arid conditions. Such ecotypic plasticity also has been noted 

 in Amby stoma macrodactylum by Kezer and Farner (1955). 



Locality records: 



MCKINLEY CO.: 6 mi. S. Thoreau (CU 6234, 6303-4; UMMZ 120301, 120305- 

 6); 8 mi. S. Thoreau (CU 6301-2, 6411; UMMZ 122929); 4 mi. NNE. Prewitt 

 (CU6307); Ft. Wingate (USNM 14409-12, 14402, 14633, 14490, 14818, 19118); 

 Nutria (USNM 8240, 8456); 2.5 mi. N. Upper Nutria (KUNMH 45762); Val- 

 encia CO.: El Morro Nat. Mon. (KUMNH 15556-7); 17.5-18 mi. NE. Grants 

 (UNMCV 1122-28). 



Comparative material examined: 



Ambystoma tigrinum nebulosum. — New Mexico: Bernalillo co. : Sandia 

 Park (UNMCV 1129-37); 1 mi. W. and 10 mi. S. Alburquerque (UNMCV 1138- 

 61); CATRON CO.: 9 ml. E. Mogollon (UNMCV 1163-68); san miguel co.: 

 Pecos (UMMZ 67886, 71383); san juan co.: 5 mi. W. Toadlena (UNMCV 

 1111-13); 2 mi. S. Washington Pass (UNMCV 1119-21); Arizona: apache co.: 

 Wheatfield Cr., 0.5. mi. W. Ariz.-N. M. boundary (UMMZ 121932); coconino 

 CO.: Greenland Lake, Grand Canyon Nat. Park (UMMZ 120302); 2. mi. N. 

 North Rim entrance, Grand Canyon Nat. Park (UMMZ 120303); santa 

 CRUZ CO.: Parker Canyon, Huachuca Mts. (CNHM 62616, 62638, 62640); 

 Colorado: san miguel co.: 1 mi. W. Telluride (UMMZ 121943); 9 mi. SSW. 

 Telluride (UMMZ 120304); san juan co.: Molas Lake (UMMZ 121923-29); 

 Utah: san juan co. : Monticello (UMMZ 121931); Wyoming: sublette co.: 

 Hoback Basin (UMMZ 99751). A. t. tigrinvjn. — Michigan: washtenaw co.: 

 Ann Arbor (UMMZ 69648). A. t. velasci.— Mexico: san luis potosi: San 

 Diego (UMMZ 77331). A. rosaceum. — Mexico: durango: Laguna del Pro- 

 gresso (UMMZ 102528, 110902); 2.5 mi. W. San Luis (UMMZ 110903-4); 

 sonora: Santa Maria Mine, El Tigre Mts. (UMMZ 78353).^ 



Order Anura 



Scaphiopus hanimondi Baird, S. intermontanus Cope, and 

 S. bonibifrons Cope 



Members of the subgenus Spea of Scaphiopus have been treated 

 differently with respect to specific status. Linsdale (1940, p. 200), 

 VanDenburgh (1924, p. 194), and Wright and Wright (1949, pp. 

 112-120) considered ^S. intermontanus and S. homhijrons to be races 

 of S. hammondi, an arrangement first proposed by Cope (1889). 

 S. intermontanus was placed as the northern subspecies of S. hammondi, 



* These hirvae were reported as A. tigrinum by Stebbins (1951, p. 40, pi. 52) 

 but apparently they are A. rosaceum because of their striking hght- and dark- 

 reticulated pattern (unlike any tigrinum known to me) and because of their fewer 

 gill rakers (table 3). 



