Figs. 4-15. Three views of the skull and a lateral view of the left lower jaw of each of the Recent genera of the subfamily Zapodinae. × 1.5.
Figs. 4-7. Eozapus s. vicinus, adult, male, No. 240762 USNM, Lanchow, Kansu, China.
Figs. 8-11. Zapus h. pallidus, adult, male, No. 240762 KU, 51/2 mi. N, 13/4 mi. E Lawrence, Douglas County, Kansas.
Figs. 12-15. Napaeozapus i. insignis, adult, male, No. 41109 KU, Shutsburg Rd., at Roaring Creek, 600 ft., Franklin County, Massachusetts.
Figs. 16-21. Occlusal views of upper and lower right cheek-teeth, of the three Recent genera of the subfamily Zapodinae. × 121/2.
Figs. 16 and 19. Eozapus s. vicinus, adult (age group 3), male, No. 240762 USNM, Lanchow, Kansu, China.
Figs. 17 and 20. Zapus h. alascensis, adult (age group 2), female, No. 29073 KU, E side Chilkat River, 9 mi. W and 4 mi. N Haines, Alaska.