Hanlen, James 1975 Journal Mexico trip 10 May ~5 mi. S of Pryden, and 12 mi. S of Sanderson, Val Verde Cb (~ 21 mi. stretch) several juvenile Scaphiopus couchi and one Bufo cognatus were found hopping on the road surface. A light to heavy rain either was falling or had just fallen. One B. auto speciosus was later found 6.8 mi. S of the jet with Hwy 385 in Marathon, and a DOR Thamnophis marcianus 18.3 mi. S of this junction. We continued N to Alpine where we spent the night. 11 May Arose at ~7 AM and, after breakfast, continued N on Texas hwy 90 to Int. 10 at Van Horn. Continuing W on I-10 we drove essentially straight thru to Casa Grande, Pinal Co, Arizona, where, after dinner, we collected two Sceloporus magister from along the roadside ~ .5 km. S of town along the connecting road back to the highway. Returning to I-10 we continued W to Gila Bend, Maricopa Co, where we left the highway to do some night driving along the old Hwy 80 N of Gila Bend towards Arlington, Wintersburg, Tonopah, and Harquahala Valley. This turned out to be our most successful collecting