Delaware River
Hatch Guide: Delaware River - Eastern Pennsylvania
| Hatch Timing | Scientific Name | Common Name | Hook Size |
| Apl 10-Aug 30 | Genus Chimarra | Little Black Sedge (Caddis) | 16-18 |
| Apl 15-May 15 | Epeorus pleuralis | Quill Gordon | 12-14 |
| Apl 15-May 30 | Baetis vegans | Blue Winged Olive (BWO) | 16-20 |
| Apl 24-May 24 | Paraleptophlebia adoptive | Blue Quill/Mahogany Drake | 16-18 |
| Apl 24-Jun 30 | Pteronarcys dorsata | Giant Dark Stone (Salmon Fly) | 4-8 |
| Apl 28-May 18 | Ephemerella subvaria | Henderickson | 14-16 |
| May 10-Aug 1 | Genus Brachycentrus | Grannon (Tube Case Maker) | 14-16 |
| May 15-Jun 15 | Stenonema fuscum | Gray Fox | 12-14 |
| May 21-Jun 21 | Ephemerella rotunda | Dark Hendrickson/Red Quill | 14-16 |
| May 24-Jun 30 | Stenonema vicarium | March Brown | 10-12 |
| May 28-Jun 24 | Ephemerella dorothea | Sulphur | 18-20 |
| May 28-Jun 15 | Ephemera guttulata | Green Drake | 10-12 |
| May 28-Jun 15 | Ephemera simulans | Brown Drake | 10-12 |
| Jun 1-Aug 31 | Hydropsyche morosa | Spotted Sedge | 10-16 |
| Jun 1-Jul 1 | Epeorus vitreus | Sulphur | 16-18 |
| Jun 10-Jul 4 | Ephemerella cornuta | Light Hendrickson | 14-18 |
| Jun 10-Jul 15 | Ephemerella attenuata | Blue Winged Olive (BWO) | 16-18 |
| Jun 10-Jul 10 | Isonychia bicolor | Slate Drake/Mohogany Dun | 14-16 |
| Jun 21-Aug 15 | Stenonema ithaca | Eastern Light Cahill | 14-16 |
| Jul 10-Oct 10 | Heptagenia hebe | Little Yellow Quill | 14-18 |
| Jul 21-Jul 24 | Anthopotamus distinctus | Golden Drake | 8-10 |
| Aug 1- Sep 30 | Tricorythodes stygiatus | Trico | 22-26 |
| Aug 15-Sep 30 | Ephoron leukon | White Fly (White Drake) | 12-14 |
| Sep 24-Oct 31 | Pseudocleon anoka | Tiny Blue Winged Olive | 24-28 |
| Terrestrials | |||
| Jun 1-Aug 30 | Family Formicidae | Flying Ant | 14-16 |
| Jul 20-Sep 30 | Family Tettigoniidae | Grasshoppers | 8-12 |