Part 3

24. M. orcadensis, 67106, Orkney Islands, orientation uncertain.

25. M. fortis, 63841, Chipo-ri, Korea, (d) ventral view.]

26. M. (Pitymys) fatioi, 67103, Zermatt, Switzerland, immature.

27. M. (Pitymys) pinetorum, 76834, 2 mi. N Baldwin, Douglas Co., Kansas.

28. M. (Pitymys) pinetorum, 68545, 1 mi. NE Pleasant Grove, Kansas.

29. M. (Pitymys) quasiator, 30709, Teocelo, Veracruz, (d) ventral view.

30. M. (Pitymys) quasiator, 19878, 5 km. N Jalapa, Veracruz.

31. M. (Pedomys) ochrogaster, 75036, 1 mi. N, 2 mi. E Oberlin, Kansas.

32. M. (Stenocranius) miurus, 51152, Lake Schrader, Brooks Range, Alaska.

33. M. (Stenocranius) miurus, 51169, Lake Schrader, Brooks Range, Alaska.

34. M. (Stenocranius) gregalis, 8059, "Eastern Europe."

35. M. mexicanus mexicanus, 63094, Valle de Bravo, Estado de Mexico, Mexico.

36. M. mexicanus mogollonensis, 63298, Mt. Taylor, Valencia Co., New Mexico.

37. M. californicus, 76828, 1 mi. NE Berkeley, California; (d) ventral view.

38. M. (Arvicola) richardsoni, 42454, 31 mi. N Pinedale, Sublette Co., Wyoming.

39. M. richardsoni, 37903, 23-1/2 mi. S, 5 mi. W Lander, Wyoming; distal end.]

40. Microtus (Pitymys) parvulus, UF 1508, 1 mi. W Micanopy, Florida.

41. Microtus townsendii, 79186, Sec. 33, T. 11S, R. 5W, Benton Co., Oregon.

42. Microtus (Herpetomys) guatemalensis, 65895, 2 mi. S San Juan Ixcoy, Guatemala.

43. M. guatemalensis, 65921, 10 mi. E, 4 mi. S Totonicapan, Guatemala, dorsal view of tip.

44. Microtus oeconomus, 43048, Kelsall Lake, British Columbia.

45. Microtus (Chilotus) oregoni, WBQ 3-C-248, 5 mi. N Orick, California.

46. Lagurus (Lemmiscus) curtatus, 26053, 9 mi. S Robertson, Uinta Co., Wyoming.

47. Microtus (Chionomys) nivalis, 65127, Wetterstein, Germany, orientation uncertain.

48. Microtus (Chionomys) longicaudus, 50253, Crane Flat, Mariposa Co., California.

49. Neofiber alleni, 27268, 2 mi. S Gainesville, Florida, orientation uncertain.]

(Microtus) provectus (the last three are probably insular derivatives of M. pennsylvanicus), M. (Microtus) fulviventer (perhaps derived from the same stock as Microtus mexicanus), M. (Microtus) xanthognathus (perhaps related to Microtus chrotorrhinus), M. (Microtus) coronarius, and M. (Pedomys) ludovicianus.

SPECIES OF WHICH BACULA WERE EXAMINED