Brood XIII Stragglers Sighted!

As temperatures warm in the northern states and with June just around the corner, we're starting to see some stragglers from Brood XIII territory (the greater Chicago area especially, and parts of Illinois, Indiana, Wisconsin, and Iowa)!

I recently spent some time digging into the question of whether and where septendecula appears in Brood XIII, particularly in Illinois, and found that there are county-specific records from past emergences. A search of The UConn Magicicada Database turned up 159 unconfirmed records and distribution records for the counties shown in green, and Sanborn and Heath 2009 involved septendecula collected in Cook County, IL, in 2007 (shown in orange). (Base map © GISGeography)

M. septendecula records make up just 1.5% (159/10,715) of the records in the UConn database, so it's evident that it is quite rare within Brood XIII.

Posted on May 27, 2023 08:13 PM by weecorbie