Journal Hafner, M.S. 1976 Albuquerque, Bernalillo Co., New Mexico. 16 August We awoke in Carrizozo, 0730, ate breakfast and drove via Hwy 380 and Hwy 25 to Albuquerque. The Mal Pais lava flows were quite impressive (Just west of Carrizozo). 1230 arrived at University of New Mexico where we met Dave at the Museum of Southwestern Biology. We gathered up the supplies we needed (Acetone, rubber-bulbs, immersion oil, slide boxes, "Mammals of New Mexico", etc.) then examined the slides we had already karyotyped. We were able to positively identify all but one specimen (HST 608) from the "Bar" locality near Ruidoso. This individual had 22 acrocentrics (by our determination) making it an F2 individual of the 4 and 28 acrocentric parental types. The resolution wasn't too good and we didn't have the time to properly examine the slides. We did, however determine that the break between the "races" occurs (as suspected) between the "large Meadow" and the "Creek" locality in Nogal Canyon and somewhere very near the "Bar" locality in the Ruidoso area. We now know where to concentrate our efforts. 1800 left UNM for Dave's home. Dave's mother, Gladys, was visiting them. We had a very