University of Kansas Publications
Museum of Natural History
Volume 9, No. 18, pp. 513-518, 1 map
January 14, 1960
Conspecificity of two pocket mice,
Perognathus goldmani and P. artus
BY
E. RAYMOND HALL AND MARILYN BAILEY OGILVIE
University of Kansas
Lawrence
1960
University of Kansas Publications, Museum of Natural History
Editors: E. Raymond Hall, Chairman, Henry S. Fitch,
Robert W. Wilson
Volume 9, No. 18, pp. 513-518, 1 map
Published January 14, 1960
University of Kansas
Lawrence, Kansas
PRINTED IN
THE STATE PRINTING PLANT
TOPEKA, KANSAS
1960
28-1243
Conspecificity of two pocket mice,
Perognathus goldmani and P. artus
BY
E. RAYMOND HALL AND MARILYN BAILEY OGILVIE
Perognathus goldmani Osgood and Perognathus artus Osgoodfrom southern Sonora, northern Sinaloa and adjoining parts ofChihuahua and Durango, are two named kinds of the Perognathusintermedius group of pocket mice, of the subgenus Chaetodipus.Until now the two kinds have been treated in the literature as twospecies. In both goldmani and artus the upper parts are Ochraceous-Buff(capitalized color terms after Ridgway, Color Standards andColor Nomenclature, Washington, D. C., 1912) having a strongadmixture of black. The lateral line is Ochraceous-Buff, and theunderparts are white. P. goldmani is larger than P. artus (seemeasurements beyond) and has more inflated tympanic bullae anda relatively narrower (transverse to long axis of skull) interparietalbone.
Specimens from a transect of southeastern Sonora show intergradationbetween Perognathus goldmani and P. artus. Fromnorthwest to southeast the specimens are as follows: one mile eastof Buena Vista, on Río Yaqui Reservoir, 1000 feet (2 specimens,K. U.); Alamos, 1200 feet (7, U. S. B. S.); four and a half milessoutheast of Alamos, 1000 feet (5, K. U.); nine miles southeastAlamos, 1000 feet (5, K. U.). The specimens (P. goldmani) fromRío Yaqui Reservoir are largest. Those from nine miles southeastof Alamos (P. artus) are smallest. Those from Alamos proper areP. goldmani. Those from four and a half miles southeast of Alamos(80051-80055 K. U. collected by Robert L. Packard and here referredto goldmani) include two as large as goldmani from Alamos,one as small as artus from nine miles southeast of Alamos, and twothat are intermediate in size. Features other than size, consideredgeographically, also suggest intergradation.
Six specimens (61409-61413, 61415 K. U. collected by J. R.Alcorn), including five adults (permanent fourth premolar of fullheight and having cusps worn but not so much as to make a lakeof dentine), from four miles north of Terrero, Sinaloa, also seemto be intergrades between Perognathus goldmani and Perognathusartus. As compared with adults of P. goldmani from 10 miles north-northwestof Los Mochis, Sinaloa, and P. artus from one mile south[Pg 516]of Pericos, Sinaloa, the specimens from four miles north of Terreroare almost exactly intermediate in length of hind foot, width ofinterparietal, and width of tympanic bullae. Intermediacy is shownalso in total length of animal (slight