. A biological survey of Colorado. Natural history Colorado; Mammals Colorado; Trees Colorado. M our 11 AMKKICAN FATNA. [No. 3,1 Cratogeomys castanops (Uaird). (1ios( luU-rnccd Pockoi Go])1um'. Fsciuhh^toma ca^tauops Waud, llcpt. Stansbury's Kxpcd. to Givat Salt , j). ol3, 1852. T>'pc from near Bouts Fort, Colorado (iu>ar prc^sont site of Las Animas). The large chostniit-faoed g-ophcr has not been taken much north of the type k^caht}", and the Arkansas Valley marks in a general way the northern limit of its range. (See fig. 18.) Mr. C. E. Aiken, of Colorado Springs, has a mount
. A biological survey of Colorado. Natural history Colorado; Mammals Colorado; Trees Colorado. M our 11 AMKKICAN FATNA. [No. 3,1 Cratogeomys castanops (Uaird). (1ios( luU-rnccd Pockoi Go])1um'. Fsciuhh^toma ca^tauops Waud, llcpt. Stansbury's Kxpcd. to Givat Salt , j). ol3, 1852. T>'pc from near Bouts Fort, Colorado (iu>ar prc^sont site of Las Animas). The large chostniit-faoed g-ophcr has not been taken much north of the type k^caht}", and the Arkansas Valley marks in a general way the northern limit of its range. (See fig. 18.) Mr. C. E. Aiken, of Colorado Springs, has a mounted specimen taken near the reser- voirs several miles north of Lamar, but the species appears not to reach Arlington and Chivington on the line of the Missouri Pacific Railroad. From this hititude (about 38° 150 the species ranges southward to Cliihuahua, Fig. 18.—Distribution in Colorado of chestnut-faced pocket gopher ( Cratogeomys castanops). The type specimen in the United States National Museum was collected on the ''prairie road to Bents Fort," which would be near the present site of Las Animas, whence the Biological Survey has a series of topotypes. Other specimens are from Olney and from La Junta (18 miles south). Warren has the species from the follow- ing locaHties: Lamar; Monon, Baca County; Irwin's ranch, Las Animas County; and 3 miles west of Pueblo. C. castanops may be distinguished at once from the yellow pocket gopher (Geomys lutescens), which is found with it over most of south- eastern Colorado, by its much larger size and unisulcate upper incisors. It is usually found on hard-soil fiats, while 0. lutescens prefers sandy strips of country and soft soils. The characteristic. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cary, Merritt, 1880-1918; United States. Bureau of Bi
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