This scientific report surveys mammal specimens collected in Sinaloa, Mexico, by University of Kansas field parties over several years, with special attention to species of taxonomic, geographic, and faunal interest. It opens by establishing the purpose of the ongoing study and then builds a careful identification argument around shrews of the genus Notiosorex. A specimen from El Fuerte is shown, through detailed measurements and collection data, to be Notiosorex crawfordi, while topotypes from Mazatlán are compared as Notiosorex evotis. A measurement table reinforces the distinction, using cranial dimensions from specimens in Arizona, Sinaloa, Jalisco, and Michoacán to demonstrate differences in size and proportions. The work is grounded in extensive literature on bats, shrews, mice, rabbits, armadillos, skunks, and other mammals of Mexico and the southwestern United States, underscoring its broader aim: documenting biodiversity, refining species classification, and clarifying regional distributions in a little-studied part of North America. This edition has been fully restored with modern typesetting, custom cover design.