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Emergence Schedule - Online!

Compiled by John J.P. Long for The Challenge Chapter - Trout Unlimited
"X" Denotes Peak Period

SIZE NAME JAN FEB
MAR APR MAY JUN JUL AUG SEP OCT NOV

18/20

Allocapnia granulata or vivipara
Tiny Early Winter Black Stonefly
**** **** ****

16/20

Nemouridae and Leuctridae
Tiny Late Winter Black Stonefly

*

**** ****

10/14

Taeniopteryx nivalis
Early Black Stonefly

*

**** ****

12/14

Brachyptera fasciata
Early Brown Stonefly

**

**** *

18/20

Baetis vagans
Blue Wing Olive Mayfly

***

X*** *XX* **** ***

16/18

Paraleptophlebia adoptiva
Slate Wing Mahogony Mayfly

**

XX** ****

12/14

Ephemerella subvaria
Dark Hendrickson Mayfly

**

XX*

16/18

Chimarra aterrima
Little Black Caddis

**

XX** **** **** ****

12/14

Leptophlebia cupida
Borcher's Drake Mayfly

*

**** **** **** **

14/16

Brachycentrus americanus
Grannom Caddis

*

**** **** ****

2/8

Pteronarcys dorsata
Midwestern Salmon Fly Stonefly

*

**** **** **

10/18

Rhyacophilidae fenestra
Green Rock Worm Caddis
**** ****

8/14

Perlodidae lsogenus and lsoperla
Medium Brown Stonefly
**** **** ****

10/14

Siphloplecton basale
Great Speckled Olive Mayfly

*XX

**** **

14/20

Hydropsyche bronta and simulans
Net Building Caddis

***

**** **** **** **** ****

16/18

Ephemerella dorothea
Sulphur Dun Mayfly

**

XXX* *

14/18

Alloperla caudata and imbecilla
Little Yellow and Little Green Stonefly

**

**** **** **** **** ****

14/16

Nectopsyche
White Miller Caddis

**

**** **** **** **** ****

20/22

Baetis cingulatus
Blue Wing Olive Mayfly

**

**** **** ****

14/16

Ephemerella invaria
True Hendrickson Mayfly

*X

X*** ***

14/16

Ephemerella rotunda
Light Hendrickson Mayfly

**

***

10/12

Stenonema vicarium
American March Brown Mayfly

**

**** **

12/14

Stenonema fuscum
Sand Drake Mayfly

*

XX** **

12/14

Siphlonurus rapidus
Early Gray Drake Mayfly

*

X**

10/12

Ephemera simulans
Brown Drake Mayfly

*

XX** *

8/10

Phryganlidae ptilostomis
Great Orange Sedge Caddis
**** ****

8/12

Green Oak Worm/Greenie Worm
Caterpiller
*XX* *

20/28

Diptera
Midges
**** **** **** **** ****

10/12

Isonychia sadleri
Mahogany Dun Mayfly

**X

XX**

6/8

Hexagenia limbata
Great Olive Winged Drake Mayfly

**X

X**

10/12

Isonycha bicolor
White Gloved Howdy Mayfly

***

**** **** ***

12/14

Stenonema canadense
Light Cahill Mayfly

**

**** *

10/12

Sephlonurus alternatus
Late Gray Drake Mayfly

**

XX**

10/12

Ephemera varia
Golden Drake Mayfly

**

**** *

6/8

Paragentina media
Big Golden Stonefly

*

**** *

14/18

Ephemerella lata
Slate Winged Olive Mayfly

*

**** ***

22/24

Pseudocloen anoka
Tiny Blue Winged Olive Mayfly

*

**** **** ****

18/20

Ephemerella simplex
Dark Slate Wing Olive Mayfly

*

**** **** ****

8/24

Terrestrials
Ants/Grasshoppers/Beetles/Jasids

*

**** **** **** ****

24/26

Tricorythodes stygiatus
Tiny White Wing Black Mayfly

***

**** **** ****

16/18

Paraleptophlebia debilis
Small Slate Mahogany Dun Mayfly

*

**** **** ****

18/20

Mystocides sepulchralis
Black Dancer Caddisfly
**** ****

22/24

Baetis pygmalus
Little Medium Olive Mayfl
y

***

****

12/14

Ephoron album
White Fly Mayfly

**

****

14/16

Baetis heimalis
Slate Wing Brown Mayfly
**** ****
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