e compact midden of innumerable cactus spines. The dens of
_scopulorum_ have only a few loosely scattered spine areoles
or none at all.

I am grateful to the officials of the following institutions
for permission to examine specimens from the collections under
their care: Denver Museum of Natural History; Biological
Survey Collection, U. S. Fish and Wildlife Service; American
Museum of Natural History; Museum of Vertebrate Zoology,
University of California; Museum of Zoology, University of
Michigan. The drawings of the skulls were made by Victor Hogg.

_Specimens examined._--Total 66, distributed as follows:

#Colorado.# _Baca County_: "Furnace Canyon" [= Furnish Canyon],
1 (DMNH); Regnier, 4500 +- ft., 4 (2 DMNH, 2 KU); Two Buttes
Reservoir, 4200 +- ft., 5 (3 DMNH, 2 KU). _Las Animas County_:
Fisher Peak, "about 8000 ft." [6 mi. SE Trinidad], 1 (BSC);
Long Canyon (near Martinsen), 1 (BSC); Mesa de Maya, 1 (MZ); 9
mi. W jct. Purgatory [= Purgatoire] & Chaquaqua [= Chacuaco]
rivers ("Red Rock Canyon," collector's field notes), 1 (MVZ);
Trinchera, 6 (5 DMNH, 1 AMNH); Trinidad, 5 (BSC); 20 mi. E
Walsenburg, "Huerfano Co." [probably Las Animas County], 1
(DMNH). _Otero County_: 3 mi. NW Higbee, 4300 ft., 4 (KU).
_Prowers County_: Two Buttes peak, 4600 & 4650 ft., 2 (KU).

#New Mexico.# _Union County_: Clayton, 9 (BSC); 9 mi. NE Des
Moines on the "Carramba River" [= Cimarron River], 1 (DMNH);
Folsom, 6 (BSC); Raton Range (Oak Canyon), 8 (BSC); Sierra
Grande, 9 (BSC).

#Oklahoma.# _Cimarron County_: Tesequite Canyon, 1 (MZ).

_Museum of Natural History, University of Kansas, Lawrence. Transmitted
April 20, 1953._

24-7674

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