. Distribution of mammals in Colorado. Mammals. 266 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3. Fig. 94. Distribution of Bassariscus astutus in Colorado. 1. B. a. arizonensis. 2. B. a. flavus. For explanation of symbols, see p. 9. Distribution in Colorado.—At lower eleva- tions in canyons of Western Slope (Fig. 94). Comparisons.—From B. a. nevadensis, the subspecies of Utah west of the Colorado and Green rivers and adjacent areas, B. a. ari- zonensis differs in: darker color of upper parts and blacker face, crown, and bases of ears; slightly broader rostrum; more widely spread- ing zygomatic ar
. Distribution of mammals in Colorado. Mammals. 266 MONOGRAPH MUSEUM OF NATURAL HISTORY NO. 3. Fig. 94. Distribution of Bassariscus astutus in Colorado. 1. B. a. arizonensis. 2. B. a. flavus. For explanation of symbols, see p. 9. Distribution in Colorado.—At lower eleva- tions in canyons of Western Slope (Fig. 94). Comparisons.—From B. a. nevadensis, the subspecies of Utah west of the Colorado and Green rivers and adjacent areas, B. a. ari- zonensis differs in: darker color of upper parts and blacker face, crown, and bases of ears; slightly broader rostrum; more widely spread- ing zygomatic arches; and anteriorly broader auditory bullae (after Goldman, 1932a:87). From B. a. flavus, the subspecies of the Rio Grande drainage and the Eastern Slope of Colorado, B. a. arizonenesis differs in smaller external and cranial size and slightly grayer, less yellowish pelage. Measurements.—External measurements of a young adult male and an adult female from Mesa County are: 655, 710; 317, 353; 58, 62; 35, —. Selected cranial measurements of a male from Moffat County and those of the above-mentioned two individuals are, respec- tively: condylobasal length, , , ; zygomatic breadth, , , ; inter- orbital constriction, , ,; postorbital constriction, , , ; mastoid breadth, , , ; length of maxillary toothrow, , , Remarks.—Hall and Kelson (1959:880) ascribed to Bassariscus astutus flavus a range including much of western Colorado, but the basis for their subspecific assignment of ring- tails from there is unknown to me. Cary (1911:192) cited Coloradan records under the subspecific name flavus, but at that time only two subspecies were recognized north of Mex- ico. The northern marginal record cited by Hall and Kelson (loc. cit.) is based on a broken skull (KU 29123) of an immature individual of unknown sex. The record from 2 1/2 mi. SW Mack (KU 29124) is based on a similar specimen. In my opinion, availab
Size: 1784px × 1400px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmammals
