February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

The object of this bulletin is twofold: To call attention to the richness of the United States National Museum North American land mammals, and to furnish a summary of the systematic results of the study in this field to the end of the year 1911. North America is understood as the entire continent from Panama northward, together with Greenland and the Greater and Lesser Antilles. In no other museum is the mammal fauna of so large an area so fully represented.

"With an appendix containing a full analysis of the debts of the United States, the several states, municipalities etc. Also statements of street railway and traction companies, industrial corporations, etc." (statement omitted on later vols.)