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| Dates | Common Name | Latin Name |
Hook Size Dry/Wet |
Nymph | Emerger | Dun | Spinner | Peak Emergence |
Peak Spinners |
| 3/21 - 4/21 | Blue-Wing Olive | Baetis vagans | 16, 18/ 14-18 |
Baetis Nymph | Baetis Deer Hair | Blue-Wing Olive; Dark Blue Quill | Rusty Spinner | 11am - 4pm | 11am - 4pm |
| 4/7 - 5/21 | Quill Gordon | Epeorus pleuralis | 12, 14/ 10,12 |
Dark Hare's Ear Nymph | Dark Hare's Ear Wet; Quill Gordon Wet | Quill Gordon | Rusty Spinner | 1 - 2:30pm | 5-7pm |
| 4/15 - 5/1 | Hendrickson | Ephemerella subvaria |
14,16/ 12-16 |
Dark Hare's Ear; Hendrickson; Pheasant Tail Nymphs | Hare's Ear Wet | Dark, Light Hendrickson; Red Quill |
Rusty Spinner | 1 - 4pm | 5 - 8pm |
| 5/15 - 6/15 | March Brown | Stenonema vicarium |
10,12/ 10,12 long |
March Brown Nymph | March Brown Wet | March Brown | Rusty Spinner | 10am - 6pm | 6 - 9pm |
| 5/21 - 7/1 | Sulphur | Ephemerella dorothea |
16,18/ 16 |
Dorothea Nymph | Pale Evening Dun Emerger | Pale Evening Dun; Sulphur Dun | Sulphur Spinner | 7 - 9pm | 7 - 9pm |
| 6/1 - 7/1 | Grey Fox | Stenonema fuscum |
8, 10/ 10 long |
Hare's Ear Nymph | Hare's Ear Wet | Grey Fox | Rusty Spinner | 10am - 6pm | 6 - 9 pm |
| 6/10 - 8/15 | Light Cahill | Stenacron canadense |
12,14/ 12,14 |
Light Hare's Ear | Deer Hair Emerger | Light Cahill | Light Cream Spinner | all day | twilight |
| 7/1 - 10/15 | Little Blue-Wing Olive | Pseudocloeon anoka | 22/20 | Little Olive Nymph | Little Olive Nymph | Blue-Wing Olive |
Rusty Spinner | all day | 10am - Noon |
| 7/21 - 8/15 | Trico; Little White-Wing Black | Tricorythodes stygiatus |
22-26/ 24,26 |
Black Nymph | Black Nymph | Trico | Black Spinner | 6am - 8am | 6am - 8am |
Hatch
Guide To Catskill Mayflies 
| Genus\Species | Frequency | From | To | Fly | Size | Duns | Spinners |
| Baetis
vagans intercalaris |
Common | Early April | Early May | Blue
Winged Olive |
18/20 | Noon and on | Afternoon Evening |
| Epeorus pleuralis | Common | Mid April | Early May | Quill Gordon | 12/14 | Noon and on | Afternoon Evening |
| Paraleptophlebia adoptiva |
Abundant | Mid April | Mid May | Blue Quill | 16/18 | Noon and on | Afternoon Evening |
| Ephemerella subvaria | Abundant | Late April | Mid May | Hendrickson Red Quill | 12/14 | Afternoon Evening | Afternoon Evening |
| Ephemerella invaria rotunda | Common | Mid April | Mid May | Large Sulphur | 12/14 | Afternoon Evening | Evening |
| Stenonema vicarium | Common | Mid May | Mid June | March Brown | 10/12 | Morn,Noon Afternoon | Evening |
| Pseudocloeon carolina dubium | Abundant | Mid May | Mid Oct | Tiny Blue Winged Olive | 20/26 | Afternoon Evening | Afternoon Evening |
| Stenonema fuscum | Common | Late May | Late June | Gray Fox | 12/14 | Noon and on | Evening |
| Ephemerella dorothea | Common | Late May | Late June | Sulphur Dun | 16/18 | Afternoon Evening | Evening |
| Epeorus vitreus | Infrequent | Early June | Early July | Sulphur Dun | 12/14 | Afternoon Evening | Evening |
| Ephemera guttulata | Abundant | Early June | Mid June | Green Drake | 6/8 | Afternoon Evening | Evening |
| Ephemera simulans | Common | Mid June | Late June | Brown Drake | 8/10 | Afternoon Evening | Evening |
| Isonychia bicolor | Common | Early June | Early July | Dun Variant | 8/10 | Afternoon Evening | Evening |
| Ephemerella cornuta | Abundant | Early June | Late June | Blue Winged Olive | 14 | Morn Noon | Evening |
| Ephemerella cornutella attenuata | Common | Early June | Early July | Blue Winged Olive | 16/18 | Morn | Evening |
| Stenacron interpunctatum canadence frontale | Common | Mid June | Mid July | Light Cahill | 12/14 | Afternoon Evening | Evening |
| Stenonema Ithaca | Common | Mid June | Mid June | Light Cahill | 12/14 | Afternoon Evening | Evening |
| Ephemera varia | Common | Mid June | Early Aug | Cream Variant | 8/10 | Evening | Evening |
| Potomanthus distinctus | Common | Mid June | Early Aug | Cream Variant | 8/10 | Evening | Evening |
| Tricorythodes stygiatus atratus | Abundant | Late June | Mid Oct | Trico | 24/26 | Morn | Morn |
| Ephemerella deficiens lata | Common | Mid June | Early Oct | Blue Winged Olive | 18,20/22 | Afternoon Evening | Evening |
| Isonychia harperi | Common | Late Aug | Late Sept | Dun Variant | 12/14 | Afternoon Evening | Evening |
click on picture to enlarge
Hover over picture for description, click to enlarge.
| General Hook Description | Daiichi | Avalon | Mustad | Orvis | Eagle Claw | Partridge | Tiemco |
| Wide Gape Down Eye | 1100 | NA | 80000BR | 4864 | NA | NA | 100 |
| Wide Gape Straight Eye | 1110 | NA | NA | 4641 | NA | NA | 101 |
| Standard | 1170 | A1170 | 94840 | 1176 | LO59 | L2A | 5210 |
| Standard Mini Barb | 1180 | NA | NA | 1523 | NA | NA | 5210 |
| Barbless | 1190 | NA | 80010BR | 1877 | LO61B | E1AY | 900BL |
| 2X Long | 1280 | NA | 94831 | 1638 | NA | H1A | 5212 |
| 1X Short Down Eye | 1310 | NA | 94838 | 1509 | NA | NA | 921 |
| 1X Short Up Eye | 1330 | NA | 94842 | NA | NA | NA | NA |
| Limerick Mini Barb | 1480 | NA | 94859 | 170T | NA | K1A | NA |
| General Hook Description | Daiichi | Avalon | Mustad | Orvis | Eagle Claw | Partridge | Tiemco |
| Down Eye Scud | 1130 | NA | 80250BR | 1639 | LO55 | K4A | 2487 |
| Midge / Emerger | 1140 | NA | 80100BR | 1639 | NA | NA | 206BL |
| Heavy Scud | 1150 | NA | 80200BR | 8891 | LO56 | NA | 2457 |
| Curved Shank | 1270 | A1270 | 80050BR | 1510 | LO52 | NA | 200R |
| Chironomid | 1273-In Colors | NA | NA | 161T | NA | NA | NA |
| General Hook Description | Daiichi | Avalon | Mustad | Orvis | Eagle Claw | Partridge | Tiemco |
| 2X Heavy Wet | 1530 | NA | 3908 | 1641 | NA | NA | 3769 - 1X Short |
| Standard Wet | 1550 | A1550 | 3906 | 167T | LO60 | G3A | NA |
| 1X Long Nymph | 1560 | NA | 3906B | NA | LO57 | NA | 3761 |
| 2X Long Nymph | 1710 | A1710 | 9671 | 1524 | LO63 | D4A | 5262 |
| 3X Long Nymph | 1720 | A1720 | 9672 | 1526 | LO58 | NA | 5263 |
| Swimming Nymph | 1770 | NA | 80150BR | 1512 | NA | NA | 400T Light Wire |
| General Hook Description | Daiichi | Avalon | Mustad | Orvis | Eagle Claw | Partridge | Tiemco |
| 4x Long Straight Eye | 1750 | NA | 9674 | 0167 | NA | D3ST | 9395 |
| 4 X Long Down Eye | 2220 | A2220 | 79580 | 8808 | L281 | D4A | NA |
| 6X Long | 2340 | NA | 3665A | 1511 | NA | NA | 300 |
| Aberdeen Black | 2461 | NA | 3262 | NA | NA | NA | NA |