Remarks.—Most measurements show a sexual dimorphism in this subspecies. Adult males are 15 per cent larger in external measurements except that the foot is approximately the same. Cranial measurements average approximately 5 per cent larger in males except that the breadth of the rostrum and length of the maxillary tooth-row are slightly less. South and east of Tacámbaro our specimens all were taken in dry semitropical country, where bananas and sugar cane were the principal crops grown. This subspecies has been recorded also from La Huacana, Michoacán, as well as from La Salada, the type locality, by Goldman (1911:39).
Liomys irroratus jaliscensis (Allen)
Northern Spiny Pocket Mouse; Spanish, Ratón Norteño
Heteromys jaliscensis Allen, Bull. Amer. Mus. Nat. Hist., 22:251, July 25, 1906, type from Las Canoas, approximately 20 mi. W Zapotlán, 7,000 ft., Jalisco.
Liomys irroratus jalicensis, Goldman, N. Amer. Fauna, 34:60, September 7, 1911.
Range.—Northwestern part of state.
Specimens examined, 3: nos. 120273-120275 (U. S. Nat. Mus.) from Zamora.
Remarks.—As explained in detail by Hall and Villa (1948:254) these specimens from Zamora are intergrades between L. i. jaliscensis
and L. i. acutus and with almost equal propriety could be referred to either subspecies.
Liomys irroratus acutus Hall and Villa
Northern Spiny Pocket Mouse; Spanish, Ratón Norteño
Liomys irroratus acutus Hall and Villa, Univ. Kansas Publ., Mus. Nat. Hist., 1:253, figs. 4-6, July 26, 1948, type from 2 mi. W Pátzcuaro, 7,700 ft., Michoacán.