Macrae, T.C. 2003. Agrilus (s. str.) betulanigrae MacRae (Coleoptera: Buprestidae: Agrilini), a new species from North America, with comments on subgeneric placement and a key to the otiosus species-group in North America. Zootaxa. 380, 1 (Dec. 2003), 1–9. DOI:https://doi.org/10.11646/zootaxa.380.1.1.