Thomomys bottae May 25 Russian River State Park, Mendocino Co, California, Elevation 40 ft. Young ♂ captured alive in surface runway in meadow in back of our tent. These runways were taken to be mole burrows because of being 1 ½ inches from the surface. A mole trap had been set a foot from where new diggings were noticed. On removing The new dirt) saw clint morning and dug back in burrow & caught the young gopher. Meadow covered with thick tall (2 ft.) green grass which had recently been cut. May 25 Large male trapped in same burrow system in which young female was caught. Burrow system followed travelled 1 ½ inches under surface for about 2 feet and then inclined down at about 30° angle and then dropped down to a depth of 23 inches where a nest was located. From it radiated out 5 burrows, two of which united, leaving 3 main burrows 3 inches in diameter. Nest was made of dry grass matted together - about 7 inches wide and tucked in a indentation in the side of the burrow. Burrow widened to 6 inches in the vicinity of the nest. Piece of green grass around outer edges of the nest. Ground damp and easy to dig except for large rocks and piece of wood. gopher ditorred around these. Male in breeding season. It was hard to skin because of a layer of fat and muscle sturdily attached