Figures 2-13. Bacula of microtines. Unless indicated otherwise views are (a) of the dorsum, (b) the right side, and (c) the proximal end with the dorsal surface upward. Exact localities are given in accounts of species concerned.

  1. Lemmus trimucronatus, 50678, Point Barrow, Alaska.
  2. Dicrostonyx groenlandicus, 50539, Porcupine Lake, Brooks Range, Alaska.
  3. Dicrostonyx groenlandicus, 52524, Point Barrow, Alaska.
  4. Synaptomys cooperi saturatus, WBQ 3-C-454, 3 mi. S Demotte, Indiana.
  5. Synaptomys cooperi paludis, 13716, Meade County State Park, Kansas.
  6. Phenacomys intermedius celatus, SA 2044, Quebec.
  7. Phenacomys intermedius intermedius, WBQ 3-C-309, 5.4 mi. S Moran, Teton Co., Wyoming.
  8. Clethrionomys rufocanus, 60438, 1 mi. NW Oho-ri, Korea, (d) ventral view.
  9. Clethrionomys gapperi, 42108, 31 mi. N Pinedale, Wyoming.
  10. Clethrionomys rutilus, 42865, 5 mi. NNE Gulkana, Alaska.
  11. Clethrionomys occidentalis, FWS 30, Mary's Peak, Benton Co., Oregon.
  12. Clethrionomys glareolus, 67100, Zermatt, Valais, Switzerland.

Figures 14-25. Bacula of Microtus. Unless indicated otherwise views are (a) of the dorsum, (b) the right side, and (c) the proximal end with dorsal surface upward.

  1. M. pennsylvanicus, 42439, 1 mi. S, 2 mi. E Eagle Nest, Colfax Co., New Mexico; abnormality perhaps owing to injury; dorsal view.
  2. M. pennsylvanicus, 42306, 5 mi. N, 26 mi. W Saguache, Colorado; dorsal view.
  3. M. pennsylvanicus, 43043, 20 mi. NE Anchorage, Alaska, ventral view.
  4. M. pennsylvanicus, 42430, 1 mi. S, 2 mi. E Eagle Nest, New Mexico.
  5. M. agrestis, 67102, Gryon, Switzerland.
  6. M. montanus amosus, 62241, 1/2 mi. E Soldier Summit, Wasatch Co., Utah.
  7. M. montanus nanus, 57470, 2 mi. N, 2 mi. W Pocatello, Idaho.
  8. M. montanus fusus, 42307, 5 mi. N, 26 mi. W Saguache, Colorado.
  9. M. arvalis, 67101, Vidy, Switzerland, possibly not mature.
  10. M. guentheri, 67104, Palestine.
  11. M. orcadensis, 67106, Orkney Islands, orientation uncertain.
  12. M. fortis, 63841, Chipo-ri, Korea, (d) ventral view.

Figures 26-39. Bacula of microtines. Unless indicated otherwise views are (a) of the dorsum, (b) the right side, and (c) the proximal end with the dorsal surface upward.