Look up, then look down: After the solar eclipse, a double brood of cicadas will emerge

After millions of Americans in the path of totality look up for the solar eclipse on Monday, prepare to look down: A rare double brood of cicadas is set to emerge in a few weeks.

Two different groups, or broods, of cicadas will emerge across multiple states this year in the first such emergence in 221 years. The 13-year Brood XIX will emerge in 14 states across the Southeast and Midwest, and the 17-year Brood XIII will emerge in five Midwestern states around the same time, according to the website Cicada Mania.

And like the next solar eclipse, which isn't expected to be seen in the contiguous U.S. until 2044, the next double-emergence of these two broods won't happen again for a while, next predicted in 2245.

Here's what to know about the two cicada broods emerging this year.

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When are the cicadas emerging?

Brood XIX (19) and Brood XIII (13) are estimated to emerge beginning in mid-May and last through late June. The two broods will begin to emerge when the soil 8 inches underground reaches 64 degrees, and are often triggered by a warm rain.

What are Brood XIX cicadas?

Brood XIX is estimated to emerge in these states beginning mid-May and last through late June, according to Cicada Mania:

• Alabama

• Arkansas

• Georgia

• Illinois

• Indiana

• Kentucky

• Louisiana

• Mississippi

• Missouri

• North Carolina

• Oklahoma

• South Carolina

• Tennessee

• Virginia

The brood last emerged in 2011 and has a 13-year life cycle.

What are Brood XIII cicadas?

Brood XIII will emerge these states in mid-May and end in late June:

• Illinois

• Indiana

• Iowa

• Wisconsin

The brood may also appear in Michigan, Cicada Mania says.

Unlike the other brood, these cicadas have a 17-year life cycle. They last emerged in 2007.

This article originally appeared on USA TODAY: Cicada broods to swarm in several states: When, where, what to know