Species List for Llyn Ogwen 1999
 Angle Shades
 Anomalous
 Antler
 Ashworth's Rustic
 Autumnal Rustic
 Barred Straw
 Beautiful Golden Y
 Beech Green Carpet
 Bright-line Brown-eye
 Brimstone
 Broad-bordered Yellow Underwing
 Broom Moth
 Brown Rustic
 Buff Ermine
 Burnished Brass
 Canary Shouldered Thorn
 Chevron
 Chinese Character
 Clouded Border
 Clouded-bordered Brindle
 Common Carpet
 Common Lutestring
 Common Marbled Carpet
 Common Rustic sp
 Common Wainscot
 Common White Wave
 Coxcomb Prominent
 Dark Arches
 Dark Brocade
 Dotted Clay
 Double Striped Pug
 Drinker
 Dusky Brocade
 Ear sp
 Early Thorn
 Flame Shoulder
 Foxglove Pug
 Ghost Moth
 Glaucous Shears
 Gold Spot
 Gold Swift
 Green Carpet
 Grey Chi
 Grey Mountain Carpet
 Haworth's Minor
 Heath Rustic
 Ingrailed Clay
 Iron Prominent
 July Belle
 July Highflyer
 Knot Grass
 Large Yellow Underwing
 Least Black Arches
 Lesser Broad Bordered Yellow Underwing
 Lesser Swallow Prominent
 Lesser Yellow Underwing
 Light Emerald
 Map-winged Swift
 Middle-barred Minor
 Minor Shoulderknot
 Mottled Beauty
 Muslin Footman
 Narrow Winged Pug
 Northern Rustic
 Northern Spinach
 Orange Swift
 Pebble Hook Tip
 Pebble Prominent
 Pink-barred Sallow
 Poplar Hawk Moth
 Purple Bar
 Purple Clay
 Red Carpet
 Sallow
 Silver Ground Carpet
 Small Angle Shades
 Small Dotted Buff
 Small Square Spot
 Small Wainscot
 Smoky Wainscot
 Snout
 Square Spot Rustic
 Spectacle
 Stripped Twin-spot Carpet
 Swallow Prominent
 True Lovers Knot
 Twin-spot Carpet
 White Ermine