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…
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