Table 1. Summary of occurrence data available for Sphodros niger and Latrodectus variolus distribution models, including the sources of data, their period of collection, and sample sizes.

Other sources include private collections, personal observations, and news articles.

Species	1960–1989 from museum, literature, and other sources	1990–2016 (1990–2015 for S. niger) from museum, literature, and other sources	1960–1989 from citizen sciences	1990–2016 (1990–2015 for S. niger) from citizen sciences	Total
Sphodros niger	44	39	0	14	97
Latrodectus variolus	22	47	0	95	164