Time of Year

Size

Latin

American

Jan 1 – Mar 30

18 / 20

Feb 20 – April 30

16 / 20

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