M.F.Smith 1980 JOURNAL 3 mi. S La Joya, 4700', Socorro Co., New Mexico May 11 Flew from San Francisco to Albuquerque, New Mexico on Saturday evening, May 10. Jim and Carol Patton and Dave Hafner met me at the airport. We stayed overnight at Dave and Diane's in Albuquerque. Left on Sunday morning to drive south to La Joya. The purpose of this trip is to follow up on the contact zone located by John and Dave Hafner and me in August-September, 1979. The contact is about 50 miles south of Albuquerque along the Rio Grande between La Joya (Thomomys bottae connectens) and San Acacia (Thomomys bottae opulentis). T.b.connectens has no acrocentric chromosomes, T.b.opulentis has ~15 pairs of acrocentrics. The subspecies are also differentiated genetically (allozymically). We will take tissues from all animals and karyotype any that are caught alive. Pulled off the highway at the La Joya exit. Drove through La Joya and south along a dirt road past one windmill and camped at near the second windmill. Split up to set out traps. Jim and Carol went north along a canal about 2 miles and then south on the other side of the canal about 2 miles. Dave and I went south from the camp. I set my traps out