ADAPTATIONS AND DISTRIBUTION 



2.8 



Fig. 32. Large tank with shallow margin.s and turbid water draining from buffalo grass 

 prairie (pinion- juniper in distance) three miles south of Las Vegas, New Mexico. 

 Breeding site of two species of Scaphiopus. S. hombifrons used this pool twice in the 

 summer of 1940, whereas S. hammondii used it only once and in relatively small 

 numbers. Water seeping through the dam in the background collected in a ditch 

 used by Pseudacris triseriata for breeding. From here water passing beneath a rail- 

 road and gathered in the ditch shown in Fig. 3. Rana brachycephala Cope may also 

 use this pool sometimes. A mated pair was seen on its bank but no chorus was ob- 

 served nor were its tadpoles found here. Photo by the author, .August 17, 1940. 



Fig. }>i. Gallinas Creek just above its emergence from the mountains onto the plains at 

 Montezuma, about seven miles northwest of Las Vegas, New Mexico. Breeding site 



of Rana brachycephala Cope and B«/o w. woodhousii. Photo bv the author, Ausjust 

 18, 1940. 



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