Northern Ontario's Hatch Chart 

Stonefly

Early Brown Stonefly, 14-16 hook, Midday Hatch,  Early April-Mid May 
Early Black Stonefly, 18-22 hook, Midday Hatch, Mid March-Early May
Salmonfly, 4-2 hook, Midday Hatch, Mid May-Early July 
Yellow Sally, 12-14 hook, Evening Hatch, Early June-Mid August
Little Yellow Stonefly, 10-12 hook, Evening Hatch, Early June-Late July
Great Brown Stonefly, 6-8 hook, Afternoon and Evening Hatch, Early June-Late July
Eastern Golden Stonefly, 6-10 hook, and Evening Hatch, Early June-Late July
Eastern Creeper, 6-10 hook, Afternoon and Evening Hatch, Early June-Late July

Mayfly

Brown Spinner, Black Quill, 14-18 hook, Midday Hatch, Early April-Late May
Blue Quill, 14-18 hook, Midday Hatch, Early April-Mid May
Early Blue-Winged Olive, 16-18 hook, Midday Hatch, Early April-Late May
Light Cahill, 14-18 hook, Midday Hatch, Mid April-Late June
March Brown, Gray Fox Varriant, 10-12 hook, Midday Htch, Early April-Late May
Mahogany Dun, 10-14 hook, Afternoon Hatch, Late May-Early July
Eastern Gray Drake, 8-10 hook, Evening Hatch, Early June-Early July
Brown Drake, 8-10 hook, Evening Hatch, Late June-Mid July
Giant Drake ( Hex ), 8-4 hook, Evening Hatch, Late June-Mid July
Speckled Spinner, 10-14 hook, Evening Hatch, Late June-Late August

Caddis

Little Tan Short-horn Sedge, 12-14 hook, Evening Hatch, Early April-Late August
Rush Sedge Caddis, 6-10 hook, Midday Hatch, Early April-Early July
Smoky Wing Sedge, 14-16 hook, Midday Hatch, Late April-Late May
Scaly Wing Sedge 14-16 hook, Midday Hatch, Early May-Early July
American Grannom, 14-16 hook, Evening Hatch, Early June-Mid July
Spotted Sedge, 14-16 hook, Evening Hatch, Early June-Mid July
Dark Blue Sedge, 14-18 hook, Evening Hatch, Early June-Mid July
Little Black Sedge, 14-18 hook, Evening Hatch, Early June-Mid September
Green Sedge, 12-16 hook, Evening Hatch, Early June-Late August
Great Dive-bomber Sedge, 8-12 hook, Evening Hatch, Late June-Early September
White Miller, 8-12 hook, Evening Hatch, Early August-Late September
Great Orange Sedge, 8-12 hook, Afternoon Hatch, Early August-Mid October

What a tourist terms a plague of insects, the fly fisher calls a great hatch.
Patrick F. McManus

While the majority of brookies are taken on streamers,
most fly fishermen can't resist a good hatch.

Northern Ontario's Hatch Chart