The Bi-Monthly Zoological Bulletin of the Division of Zoology of the Pennsylvania Department of Agriculture

The Bi-Monthly Zoological Bulletin was an official publication issued by the Division of Zoology under the Pennsylvania Department of Agriculture during the early 20th century. Established as a tool for public education and agricultural support, these bulletins were intended to inform local farmers, orchardists, and the general public about the identification and management of various insects, birds, and small mammals that impacted state agriculture. The publication served as a primary conduit for the department to disseminate scientific findings and practical advice on pest control and ecological management.

The bulletins are characterized by their rigorous, pragmatic approach to natural history, emphasizing direct observation and morphological description. The content was primarily curated by state zoologists, most notably H.A. Surface, who served as the State Zoologist of Pennsylvania during the series' active years. The design was utilitarian, often featuring detailed woodcut illustrations and lithographic plates intended to assist in the accurate field identification of species. While these documents were produced as ephemeral government resources, they remain valued by historians today for documenting the shifting ecological landscape and agricultural priorities of Pennsylvania at the turn of the century.