Part 15

In color, specimens from the northern part of the valley of the Rio Tepalcatepec (10 mi. S, 1 mi. W Apatzingan) in Michoacan resemble paratypes of allex. Intergradation probably occurs to the north with analogous.

In the eight specimens from 13 mi. E and 1 mi. N Talpa de Allende, the skull, as reflected in occipitonasal length and zygomatic breadth relative to length of body, is larger than in other specimens here assigned to allex. The median part of the belly of the eight specimens is buff-colored rather than whitish-gray as in typical allex; the mid-dorsal region also averages darker than in any other specimens referred to allex. Additional specimens are needed from this and closely adjacent areas, especially to the west on the coastal plain, in order to determine more accurately the taxonomic status of the mice there. At present, it seems best to refer them to allex. Possibly the population represented by the eight specimens is an incipient subspecies.

There is no evidence of hybridization or intergradation of populations of B. t. allex with any population of B. musculus where the two species occur together.

Specimens examined.--Total 233, all from the Republic of Mexico, distributed as follows: NAYARIT: 3 mi. SE Mirador, 7; 2 mi. S. Compostela, 2900 ft., 5; 4 mi. N Santa Isabel, 3800 ft., 2; 2 mi. N Santa Isabel, 3800 ft., 22; 4 mi SE Ahuacatlan, 5200 ft., 2; 1 mi. E Ixtlan, 4000 ft., 13; 1 mi. E Ixtlan del Rio, 3700 ft., 1; 2 mi. WNW Valle de Banderas, near sea level, 1. JALISCO: Arroyo de Gavalan, 16; Etzatlan, 6; Mascota, 3900 ft., 6; 7 mi W Ameca, 15; 6 mi. W Ameca, 15; 3 mi. W Ameca, 5; Ameca, 4000 ft., 11; 1 mi. SSE Ameca, 4000 ft., 38; 2 mi. N Resolana, 1500 ft., 28; 13 mi. E, 1 mi. N Talpa de Allende, 8; 2 mi. SSE Autlan, 5; 1 mi. N San Gabriel, 4000 ft., 1; Las Canoas, l. COLIMA: Type locality, 10 (including the type). MICHOACAN: 9 mi. S Lombardia, 1500 ft., 1; 3 mi. W Apatzingan, 1000 ft, 1; Apatzingan, 3; 10 mi. S, 1 mi. W Apatzingan, 800 ft., 10.

Marginal records.--NAYARIT: 3 mi. SE Mirador; 1 mi. E Ixtlan del Rio. JALISCO: Etzatlan; Ameca; 2 mi. N Resolana; Las Canoas. MICHOACAN: 9 mi. S Lombardia; 10 mi. S, 1 mi. W Apatzingan. COLIMA: type locality. NAYARIT: Valle de Banderas.

Univ. Michigan, Museum of Zoology.

California Academy of Sciences.

U. S. Nat. Museum (Biol. Surv. Coll.).

American Museum of Natural History.

=Baiomys taylori analogous= (Osgood)

Peromyscus taylori analogous Osgood, N. Amer. Fauna, 28:256, April 17, 1909 (part); Elliott, Check-List Mamm., N. Amer. Cont., West Indies and Neighboring Seas, Suppl., Amer. Mus. Nat. Hist., p. 44, January 8, 1917.

Baiomys taylori analogous, Miller, Bull. U. S. Nat. Mus., 79:137, December 31, 1912; Miller, Bull. U. S. Nat. Mus., 128:318, April 29, 1924; Ellerman, The Families and Genera of Living Rodents, British Mus. Nat. Hist., 2:402, March 21, 1941; Poole and Schantz, Bull. U. S. Nat. Mus., 178:259, March 6, 1942; Davis, Jour. Mamm., 25:394, December 12, 1944; Hooper, Jour. Mamm., 28:50, February 15, 1947; Hall and Villa-R., Univ. Kansas Publs., Mus. Nat. Hist., 1:460, December 27, 1949; Hall and Villa-R., Anal. del Inst. Biol., 21:196, September 28, 1950; Goldman, Smith. Miscl. Coll., 114:373, July 31, 1951 (part); Hall and Kelson, Univ. Kansas Publs., Mus. Nat. Hist., 5:367, December 15, 1952 (part); Villa-R., Anal. del Inst. Biol., 23:435, May 20, 1953; Miller and Kellogg, Bull. U. S. Nat. Mus., 205:512, March 3, 1955; Hooper, Occas. Papers Mus. Zool. Univ. Michigan, 565:13, March 31, 1955; Packard, Proc. Biol. Soc. Washington, 71:17, April 11, 1958.

Peromyscus musculus brunneus, Elliot, Field Columb. Mus. Publ., 115(8):203, 1907 (part).

Peromyscus musculus [musculus], Osgood, N. Amer. Fauna, 28:258, April 17, 1909 (part).

Baiomys musculus musculus, Hall and Villa-R., Univ. Kansas Publs., Mus. Nat. Hist., 1:460, December 27, 1949 (part); Hall and Villa-R., Anal. del Inst. Biol., 21:196, September 28, 1950 (part).

Baiomys taylori taylori, Dalquest, Louisiana State Univ. Studies (Biol. Sci. Ser.), 1:155, December 28, 1953 (part); Hall and Kelson, The Mammals of North America, 2:660, March 31, 1959 (part).

Baiomys taylori allex, Hall and Kelson, The Mammals of North America, 2:659, March 31, 1959 (part).

Baiomys musculus musculus, Hall and Kelson, The Mammals of North America, 2:661, March 31, 1959 (part).

Type.--Adult male, skin and skull; No. 120261 U. S. Nat. Mus. (Biol. Surv. Coll.); Zamora, Michoacan, Republic of Mexico, obtained on January 15, 1903, by E. W. Nelson, and E. A. Goldman, original number 15764.

Range.--Central and eastern Jalisco south into Michoacan, east through Guanajuato, Queretaro, thence into Estado Mexico, and Distrito Federal, and west-central Veracruz, see Figure 11. Zonal range: approximately the Transverse Volcanic Biotic Province of Moore (1945:218) and of Goldman and Moore (1945:349). Occurs from 5000 feet, 7 mi. S Ocotlan, Jalisco, up to 8000 feet in Ixtapalapa, Distrito Federal.

Diagnosis.--Size large for the species; dorsum dark Sepia to near blackish medially in freshly taken specimens (Sepia fading to near Fuscous in prepared specimens); belly slaty-gray, hairs Deep Neutral Gray near tips and Dusky Neutral Gray at bases; hairs on back black-tipped with subterminal band of Ochraceous-Tawny (guard hairs blackish to base); hairs of throat and chin white-tipped, gray at bases; dorsal vibrissae black, ventral and anteriormost vibrissae white; hairs on face and sides black-tipped, and Ochraceous-Tawny at base; ears sparsely haired, individual hairs grayish, blackish, and ochraceous; tail sooty to blackish dorsally, lighter ventrally; forefeet and hind feet sooty brown on dorsal and ventral surface. Skull relatively broad interorbitally; zygoma broad and squared; cranium larger in all dimensions than in most other subspecies. Average and extreme measurements of 10 adults from 1 mi. S, 11 mi. W Zamora, 5400 ft., Michoacan, are: total length, 109.4 (102-121); length of body, 64.3 (58-72); length of tail, 44.9 (39-51); length of hind foot, 14.6 (14-15); occipitonasal length, 18.0 (17.5-18.6); zygomatic breadth, 9.4 (9.1-9.7); postpalatal length, 6.6 (6.2-7.2); least interorbital breadth, 3.5 (3.3-3.8); length of incisive foramina, 4.0 (3.8-4.2); length of rostrum, 6.2 (5.8-6.5); breadth of braincase, 8.7 (8.5-8.9); depth of cranium, 6.6 (6.3-6.9); alveolar length of maxillary tooth-row, 3.1 (3.0-3.3); for photographs of skull, see Plate 2a and Plate 4b.

Comparisons.--For comparisons with B. t. allex, B. t. canutus, B. t. paulus, and B. t. fuliginatus, see accounts of those subspecies. From B. t. taylori, B. t. analogous differs as follows: sides and dorsum darker, differing most in freshly prepared specimens; dorsal surface of forefeet and hind feet darker; basal part of hairs on belly darker gray; frontal bones less constricted, causing less taper anteriorly in interorbital space; interparietal wider transversely; basioccipital more expanded laterally, narrowing more abruptly at suture between basioccipital and basisphenoid.

Remarks.--The pelage of analogous becomes paler with wear as pointed out by Osgood (1909:257). A paratype, U. S. Nat. Mus. 120260, and several specimens from 1 mi. S, 11 mi. W Zamora, Michoacan, are grayish rather than brownish-black. All of these are old adults having the terminal black parts of the hairs on the dorsum nearly worn away. Excluding such grayish individuals, B. t. analogous, like B. t. subater and B. t. fuliginatus, is uniformly brownish-black. Both analogous and fuliginatus occur in relatively high mountainous country on dark soils or pedregals, and all three of the aforementioned subspecies occur in zones of high relative humidity.

B. t. analogous intergrades with B. t. paulus (see account of that subspecies) and B. t. allex south and west of Lago de Chapala in Jalisco. Additional specimens are needed from Queretaro and San Luis Potosi in order to ascertain whether or not B. t. analogous intergrades with B. t. fuliginatus or B. t. taylori. Specimens from western Jalisco, in the past referred to B. t. analogous, are referable to B. t. allex (see account of that subspecies). Specimens obtained west of, and bordering, the Rio del Naranjo in Jalisco show a mixture of characters of both B. t. allex and B. t. analogous. For example, specimens from 2 mi. N Ciudad Guzman resemble analogous on the dorsum, whereas, on the belly, the individual hairs are white-tipped, pale gray at the base, and in over-all appearance are whitish-gray, unlike typical analogous (being like allex instead). The dorsal surface of the forefeet are sooty to light brownish (as in analogous), whereas, the hind feet are flesh-colored (as in allex). Another series of specimens from 4 mi. W Leon, Guanajuato, are intergrades between B. t. analogous and B. t. paulus. These specimens are grayish to brownish on the dorsum, have sooty forefeet and hind feet (more nearly as in analogous than in paulus), are grayish-white on the venter, and have a distinctly bicolored tail (resembling that of paulus more than that of analogous). When the average of cranial characters is considered, both series are best referred to analogous.

Hooper (1947:50) pointed out that specimens from the pedregal San Geronimo, Distrito Federal, were more nearly black than topotypes and generally showed less brownish hues typical of analogous. I have examined this series and several others from this area (see Specimens examined, p. 640) and am convinced that these populations average darker. Actually, the dorsum is more nearly black and the venter is more buffy than in typical analogous. The hairs of these individuals average longer than in other populations of analogous. Skulls of the specimens from the pedregal are indistinguishable from those of paratypes of analogous. The populations from the Distrito Federal seem to be incipient subspecies.

Specimens examined.--Total 696, all from the Republic of Mexico, distributed as follows: SAN LUIS POTOSI: Hacienda Capulin, 5; 3.3 mi. N Tamazunchale, by-road, 2; 1 mi. N Tamazunchale, 700 ft., 1. VERACRUZ: Acultzingo, 4, 1. JALISCO: 1 mi. S Jalostotitlan, 5700 ft., 5; 7 mi. NW Tepatitlan, 3; 6 mi. N, 4 mi. E Tepatitlan, 6400 ft., 25; 2-1/2 mi. E Tepatitlan, 6200 ft., 15; 2 mi. S, 1/2 mi. W Tepatitlan, 9; near Tepatitlan, 2; 5 mi. SW Arrandas, 6700 ft., 6; 2 mi. E Zapotlanejo, 23; 2-1/2 mi. E Puente Grande (5-1/2 mi. SW Zapotlanejo), 3; 8 mi. S Guadalajara, 10; 3 mi. ENE Santa Cruz de las Flores, 9; 4 mi. NE Ocotlan, 5050 ft., 18; 13 mi. S, 9-1/2 mi. W Guadalajara, 1; 2 mi. WNW Ocotlan, 5000 ft., 15; 13 mi. S, 15 mi. W Guadalajara, 2; Ocotlan, 5000 ft., 8; 1 mi. S Ocotlan, 5000 ft., 12; 27 mi. S, 12 mi. W Guadalajara, 9; 1-1/2 mi. N Mazatmitla, 6; 1/2 mi. NW Mazatmitla, 4; 3 mi. WSW Mazatmitla, 4; 2 mi. N Ciudad Guzman, 5000 ft., 18. GUANAJUATO: 4 mi. N, 5 mi. W Leon, 7000 ft., 25; 5 mi. S Salamanca, 2; 5 mi. E Celaya, 6000 ft., 6; 1 mi. E Yuriria, 5725 ft., 3; Salvatierra, 5775 ft., 8; NE edge Acambaro, 6050 ft., 10; Acambaro, 3. QUERETARO: Toliman, 7; 6 mi. E Queretaro, 6550 ft., 37. HIDALGO: Tula, 2050 m., 1. MICHOACAN: 2 mi. E La Palma, SE side Lago de Chapala, 7; type locality, 4000 ft., 10 (including the type); 9 mi. E Zamora (Camenaro), 2; 1 mi. S, 11 mi. W Zamora, 5400 ft., 17; S Cuitzeo, 36; Jiquilpan, 4800 ft., 15; 11 mi. W Jiquilpan, 6700 ft., 2; 1 mi. E Jiquilpan, 7; 1 mi. E Zinapecuaro, 6300 ft., 17; 4-1/2 mi. NE Tarequato (Tarecuato), 6600 ft, 1; Tanganciguaro (Tangancicuaro), 5500 ft., 4; 2 mi. N Tarecuato, 7200 ft., 1; 2 mi. S Maravatio, 6650 ft, 6; 2 mi. SE Zacapu, 6600 ft., 11; 1 mi. N Tinquindin (Tinguindin), 6300 ft., 2; 3 mi. E Morelia, 6600 ft., 3; 11 mi. E, 2 mi. S Morelia, 1; 2 mi. SE Hidalgo (Villa Hidalgo), 6; 1-1/2 mi. N Los Reyes, 1; E Los Reyes, 18; Los Reyes, 8; 3 mi. W, 1 mi. N Patzucuaro, 6600 ft., 2; N Patzucuaro, 2; Patzucuaro 9, 4, 4; Uruapan, 1; E Uruapan, 12; 2-1/2 mi. E Uruapan (La Presca), 2; 2 mi. SW Zitacuaro, 1; 1 mi. E, 6 mi. S Tacambaro, 4000 ft., 11; La Huacana, 1. MEXICO: Templo del Sol, Pyramides de San Juan, Teotihuacan, 8000 ft., 1; 31 km. E Mexico City, 7500 ft., 11; 17 km. E Mexico City, 7500 ft, 1; Cerro La Caldera, 11 mi. ESE Mexico, 2350 m., 5; 4 km. ENE Tlalmanalco, 2290 m., 9; Hacienda Cordoba (Cordova), 6. MEXICO, D. F.: Cerro de la Estrella, Ixtapalapa, 2450 m., 1; 3/4 mi. S, 1 mi. E Churubusco, 2400 m., 2; 5 km. S Mexico City, South of Cd. Universitaria, l; Pedregal San Angel, 2.6 mi. S Monumento a Obregon, 2; El Pedregal, 1 km. S San Angel, 2260 m., 1; Falda SW Cerro Zacatepec, 3.9 mi. SW Monumento a Obregon, 1; 2 mi. N Tlalpan, Zacayuca, 2380 m., 5; Tlalpan (Pedregal), 2400 m., 21; San Geronimo, 37, 6; Santa Rosa, 2700 m., 1; Tlalpan, 8; 3/4 mi. SW Las Fuentes, Tlalpan, 2450 m., 25; Tepepan, 6; Rancho La Noria, 1 mi. W Xochimilco, 2270 m., 4; 500 meters N Xochitepec, 2250 m., 7; 200 m. N San Mateo Xalpa (Jalpa), 2390 m., 2.

Marginal records.--SAN LUIS POTOSI: Hacienda Capulin; 1 mi. N Tamazunchale. HIDALGO: Tula, 2050 m. MEXICO: Templo del Sol, Pyramides de San Juan, Teotihuacan. VERACRUZ: Acultzingo. MEXICO: 4 km. ENE Tlalmanalco. MEXICO, D. F.: 200 m. N San Mateo Xalpa (Jalpa), 2390 m. MICHOACAN: 2 mi. SW Zitacuaro; 1 mi. E, 6 mi. S Tacambaro; Uruapan. JALISCO: 2 mi. N Ciudad Guzman; 27 mi. S, 12 mi. W Guadalajara; 13 mi. S, 15 mi. W Guadalajara; 7 mi. NW Tepatitlan; 1 mi. S Jalostotitlan, 5700 ft. GUANAJUATO: 4 mi. N, 5 mi. W Leon. QUERETARO: 6 mi. E Queretaro, 6550 ft.; Toliman.

Univ. Michigan, Museum of Zoology.