From 1910 to 1919 McDunnough produced, with Barnes credited as co-author, an impressive volume of research on the taxonomy of North American Lepidoptera, including the first four volumes of the privately published Contributions to the Natural History of the Lepidoptera of North America, the 1917 Check list of the Lepidoptera of Boreal America, Illustrations of the North American Species of the Genus Catocala, and numerous journal articles, 67 papers in all. He also published nine articles solely under his own name during this period.[3]
In 1918, McDunnough spent a summer helping with the Canada National Collection of Insects (now the Canadian National Collection of Insects, Arachnids and Nematodes) by arranging the microlepidoptera part of the collection. This led to his leaving the job with Barnes in 1919 and heading the newly created Division of Systematic Entomology within the Entomological Branch of the Canadian Department of Agriculture. He remained there until 1946.[3]
During those 28 years, he oversaw the development of the Canadian National Collection into a world-class repository of insect and other arthropod specimens along with an extensive library of entomological publications, conducted faunal surveys throughout Canada, and published 199 taxonomic papers.[3]
In 1950, after the death of his wife, he moved to Halifax, Nova Scotia, where he became a research associate for the Nova Scotia Museum of Science, while still publishing papers through the AMNH. The following year, he became the first president of the Lepidopterists' Society.[4] His last paper was published in the year of his death, 1962, at the age of 84.[3]
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