| Time of Year |
Size |
Latin |
American |
| Jan 1 – Mar 30 |
18 / 20 |
Allocapnia granulata or vivipara |
Tiny Early Winter Black Stonefly |
| Feb 20 – April 30 |
16 / 20 |
Nemouridae and Leuctridae |
Tiny Late winter Black Stonefly |
| Feb 20 – April 30 |
10 / 14 |
Taeniopteryx nivalis |
Early Black Stonefly |
| March 20 – May 10 |
12 / 14 |
Brachyptera fasciata |
Early Brown Stonefly |
| April 10 – Aug 20 |
18 / 20 |
Baetis vagans |
Blue Wing Olive Mayfly |
| April 20 – June 30 |
16 / 18 |
Paraleptophlebia adoptive |
Slate Wing Mahogany Mayfly |
| April 10 – May 20 |
12 / 14 |
Ephemerella subvaria |
Dark Hendrickson Mayfly |
| April 20 – Aug 30 |
16 / 18 |
Chimarra aterrima |
Little Black Caddis |
| April 30 – Aug 10 |
12 / 14 |
Leptophlebia cupida |
Borcher’s Drake Mayfly |
| April 30 – Aug 1 |
14 / 16 |
Brachycentrus americanus |
Grannom Caddis |
| April 30 – July 10 |
2 / 8 |
Pteranarcys dorsata |
Midwestern Salmon Fly Stonefly |
| May 1 – June 30 |
10 / 18 |
Rhyacophilidae fenestra |
Green Rockworm Caddis |
| May 1 – July 30 |
8 / 14 |
Perlodidae isogenus and isoperla |
Medium Brown Stonefly |
| May 1 – July 10 |
10 / 14 |
Siphloplecton basale |
Giant Olive Speckled Mayfly |
| May 10 – Oct 30 |
14 / 20 |
Hydropsyche bronta and simulans |
Net Building Caddis |
| May 20 – July 10 |
16 / 18 |
Ephemerella dorothea |
Sulphur Dun Mayfly |
| May 20 – Oct 30 |
14 / 18 |
Alloperla caudata and imbecilla |
Little Yellow and Little Green Stonefly |
| May 20 – Oct 30 |
14 / 16 |
Nectopsyche |
White Miller Caddis |
| May 20 – Aug 30 |
20 / 22 |
Baetis cingulatus |
Blue Wing Olive Mayfly |
| May 20 – July 20 |
14 / 16 |
Ephemerella invaria |
True Hendrickson Mayfly |
| May 20 – June 20 |
14 / 16 |
Ephemerella rotunda |
Light Hendrickson Mayfly |
| May 20 – July 20 |
10 / 12 |
Stenonema vicarium |
American March Brown Mayfly |
| May 30 – July 20 |
12 / 14 |
Stenonema fuscum |
Sand Drake Mayfly |
| May 30 – July 30 |
12 / 14 |
Siphlonurus rapidus |
Early Grey Drake Mayfly |
| May 30 – July 10 |
10 / 12 |
Ephemera simulans |
Brown Drake Mayfly |
| June 1 – July 30 |
8 / 10 |
Phryanlidae ptilostomis |
Great Orange Sedge Caddis |
| June 1 – July 10 |
8 / 12 |
Green Oakworm |
Greeni worm caterpillar |
| June 1 – Oct 30 |
20 / 28 |
Diptera |
Midges |
| June 1 – July 30 |
10 / 12 |
Isonychia sadleri |
Mahogany Dun Mayfly |
| June 1 – July 20 |
6 / 8 |
Hexagenia limbata |
Great Olive Winged Drake Mayfly |
| June 10 – Sept 20 |
10 / 12 |
Isonychia bicolor |
White Gloved Howdy Mayfly |
| June 20 – Aug 10 |
12 / 14 |
Stenonema canadense |
Light Cahill Mayfly |
| June 20 – July 30 |
10 / 12 |
Sephlonurus alternatus |
Late Grey Drake Mayfly |
| June 20 – Aug 1 |
10 / 12 |
Ephemera varia |
Golden Drake Mayfly |
| June 20 – Aug 1 |
6 / 8 |
Paragentina media |
Big Golden Stonefly |
| June 20 – Aug 20 |
14 / 18 |
Ephemerella lata |
Slate Wing Olive Mayfly |
| June 30 – Sept 30 |
22 / 24 |
Pseudocloen anoka |
Tiny Blue Winged Olive Mayfly |
| June 30 – Sept 30 |
18 / 20 |
Ephemerella simplex |
Dark Slate Winged Olive Mayfly |
| June 30 – Oct 30 |
8 / 24 |
Terrestrials |
Ants /Hoppers/Beetles/Jasids |
| July 10 – Oct 30 |
20 / 24 |
Tricorythodes stygiatus |
Tiny White Wing Black Mayfly |
| July 30 – Oct 30 |
16 / 18 |
Paraleptophlebia debilis |
Small Slate Mahogany Dun Mayfly |
| Aug 1 – Sept 30 |
18 / 20 |
Mystocides sepulchralis |
Black Dancer Caddis Fly |
| Aug 10 – Sept 30 |
20 / 24 |
Baetis pygmalus |
Little Medium Olive Mayfly |
| Aug 10 – Sept 30 |
12 / 14 |
Ephron album |
White Fly Mayfly |
| Sept 1 – Aug 30 |
14 / 16 |
Baetis heimalis |
Slate Wing Brown Mayfly |
