قراءة كتاب New Subspecies of the Rodent Baiomys From Central America University of Kansas Publications, Museum of Natural History
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New Subspecies of the Rodent Baiomys From Central America University of Kansas Publications, Museum of Natural History
UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY
Volume 9, No. 15, pp. 397-404
December 19, 1958
New Subspecies of the Rodent Baiomys From Central America
BY
ROBERT L. PACKARD
UNIVERSITY OF KANSAS
LAWRENCE
1958
UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY
Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Robert W. Wilson
Volume 9, No. 15, pp. 397-404 Published December 19, 1958
UNIVERSITY OF KANSAS Lawrence, Kansas
PRINTED IN THE STATE PRINTING PLANT TOPEKA, KANSAS 1958
27-5660
New Subspecies of the Rodent Baiomys From Central America
BY
ROBERT L. PACKARD
The southern pygmy mouse, Baiomys musculus, is known as far north as the Mexican states of Jalisco, Michoacán, south of the Mesa Central, east to central Veracruz (see Hooper, 1952a:90), and south to western Nicaragua (see Goodwin, 1942:161). Previously, two subspecies have been recognized from the southern part of the known range of this species: B. m. nigrescens, blackish mice from Chiapas, México, and Guatemala, and B. m. grisescens, grayish-brown mice from Honduras and western Nicaragua. Study of recently acquired specimens from Guatemala, El Salvador, and Nicaragua reveals two additional subspecies.
For the loan of comparative material, I am grateful to the United States National Museum (USNM) and the American Museum of Natural History (AMNH). Unless otherwise indicated, specimens are in the University of Kansas Museum of Natural History. Measurements are as taken by Hooper (1952b:10). Postpalatal length is the distance from the posterior margin of the hard palate to the anterior margin of the foramen magnum. Unless otherwise noted, statistical significance as used in this paper is at the 95 per cent confidence limit or higher.
The two heretofore undescribed subspecies are characterized below and may be known as:
Baiomys musculus handleyi, new subspecies
Type.—Adult female, USNM No. 275604 (Biological Surveys Collection), skin and skull; from Sacapulas, El Quiché, Guatemala; obtained on April 24, 1947, by Charles O. Handley, Jr., original number 991.
Distribution.—Known only from the type locality; probably inhabits parts of the east-west drainage of the Río Negro.
Diagnosis.—General ground color of upper parts between Wood Brown and Buffy Brown (all capitalized color terms are those of Ridgway, Color Standards and Color Nomenclature, Washington, D. C., 1912), dorsal parts of fore- and hind-feet, and ankles white; in region of median venter, throat, and chin, hairs white to base; in lateral regions hairs Neutral Gray at base; dorsal hairs below tips Avellaneous, Neutral Gray at base; guard hairs black-tipped; tail white below, brownish above; nasals truncate anteriorly; frontalparietal suture forming an obtuse angle with median-parietal suture; alveolar-length of upper molar tooth-row and tail long.
Comparisons.—From Baiomys musculus nigrescens (paratypes, from the Valley of Comitán, Chiapas, México), found to the north, B. m. handleyi differs in: color paler dorsally and ventrally; fore- and hind-feet whitish instead of dusky to sooty; hairs in region of facial vibrissae white instead of brown; tail bicolored instead of unicolored; anterior tips of nasals square, not rounded; frontoparietal suture forming obtuse angle with median parietal suture instead of a right angle; tail and alveolar length of