M.S. Richardson 22 Catalogue 734 783 Microtus skull only 177-59-21-13 784 Microtus skull only 147-45-20-11 785 Citellus skull only 385-148-57-20. 786 Bulo 787 Barton Snake 788 Barton Snake. August 1, 1934. 789 Blancomyz 290-135-37-20 790 Blancomyz 250-110-37-18 791 Callospermophilus 280-92-43-17 792 Thomomys skull only 194-58-27-5 793 Eutamias skull only 204-78-35-17 794 Eutamias skull only 215-90-34-15 795 Eutamias skull only 225-95-35-15 796 Microtus skull only 200-42-21-12 797 Microtus skull only 164-54B-21-10 798 Microtus skull only 172-54-21-12 799 Microtus skull only 174-55-21-9 800 Microtus skull only 180-62-22-11 801 Microtus skull only 174-63-22-13 802 Microtus skull only 141-58-21-10 803 Peromyscus skull only 140-62-20-14 804 Eutamias skull only 223-98-35-18 805 Peromyscus skull only 147-68-20-14 806 Serochorotus