Part 7

E. ruficaudus ruficaudus: Montana: Flathead Co.: 1 mi. W and 2 mi. S Summit, 5,000 ft., 2. Ravalli Co.: Big Hole Hill, 6,000 ft., 2; Big Hole Hill, 6,600 ft., 1; Continental Divide, Big Hole Hill, 7,000 ft., 1.

E. r. simulans: Idaho: Bonner Co.: Priest Lake, 1 (BS). Kootenai Co.: 13 mi. E and 5 mi. N Coeur d'Alene, 3. Shoshone Co.: Mullan, 1 (BS). Clearwater Co.: 25 mi. E and 16 mi. N Pierce, 6.

#Eutamias cinereicollis# (J. A. Allen)

Figure 13

General tone of upper parts dark grayish tawny; size medium to large; skull large; braincase widened.

Baculum: Shaft thick; keel proportionally low, 1/5 of length of tip; tip 34 per cent of length of shaft; angle formed by tip and shaft 145°; distal 1/3 of shaft slightly compressed laterally; base slightly widened; shaft long, 4.88 mm.

Differs from E. quadrimaculatus, in keel lower, ridges on either side of tip weakly developed, angle formed by tip and shaft larger; from E. speciosus, E. panamintinus, E. umbrinus, E. palmeri, and E. bulleri, in shaft longer, base not markedly widened, angle formed by tip and shaft much larger.

For comparisons with E. alpinus, E. minimus, E. townsendii, E. sonomae, E. amoenus, E. dorsalis, E. merriami, E. quadrivittatus, and E. ruficaudus, see the accounts of those species.

Specimen examined: One from Mount Thomas, White Mountains, Apache Co., Arizona (BS).

#Eutamias quadrimaculatus# (Gray)

Figure 14

General tone of upper parts bright reddish; pattern inconspicuous; light and dark facial stripes strongly contrasting; size large; skull relatively small and slightly built.

Baculum: Shaft thick; keel relatively low, 1/4 of length of tip; tip 27 per cent of length of shaft; angle formed by tip and shaft 120°; distal 1/3 of shaft slightly compressed laterally; base slightly wider than shaft; shaft long, 4.35 to 5.28 mm.

Differs from E. speciosus, E. panamintinus, E. townsendii, E. umbrinus, E. palmeri, and E. bulleri, in shaft markedly longer; base not markedly widened; angle formed by tip and shaft larger; tip proportionally shorter.

For comparisons with all other species of chipmunks from western North America, see the accounts of those species.

Specimens examined: 4.

California: Plumas Co.: Mountains near Quincy, 1 (BS). Placer Co.: Blue Canyon, 1 (NM). Alpine Co.: Markleeville, 1 (BS); N fork Stanislaus River, 1 (BS).

#Eutamias speciosus# (Merriam)

Figure 15

General tone of upper parts bright; light and dark elements of color pattern strongly contrasting; outer stripes broad and strikingly conspicuous; size medium; skull moderately broadened; dorsal outline of skull strongly arched in profile; upper incisors short and sharply recurved.

Baculum: Shaft thick; keel of medium height, 1/3 of length of tip; base of keel 1/3 of length of tip; tip 47 to 55 per cent of length of shaft; angle formed by tip and shaft 90°; distal 2/3 of shaft markedly compressed laterally; base markedly wider than shaft; shaft short to medium, 2.11 to 3.17 mm.

Differs from E. panamintinus, in base of keel proportionally shorter, angle formed by tip and shaft smaller; from E. umbrinus and E. palmeri, in keel higher, angle formed by tip and shaft smaller, distal 2/3 (not 1/2) of shaft markedly laterally compressed, base markedly wider; from E. bulleri, in keel smaller, shaft shorter, tip proportionally longer, ridges on either side of tip distinct.

For comparisons with all other species of chipmunks of western North America, see the accounts of those species.

The baculum in E. speciosus frater is approximately the same size as in E. umbrinus inyoensis, but differs in shape as described above.

Specimens examined: 6.

E. speciosus frater: California: Madera Co.: San Joaquin River, near head of N fork, Sierra Nevada Mountains, 2 (BS).

E. speciosus sequoiensis: California: Tulare Co.: Mount Whitney, 1 (BS); Sequoia National Park, 2 (BS).

E. speciosus callipeplus: California: Kern Co.: Mount Pinos, 1 (BS).