1. Labrum submarginal setae spatulate, often with broad distal maragin appearing fringed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Labiobaetis frondalis
Labrum submarginal setae not spatulate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
[Note: Labiobaetis longipalpus, which occurs in Ohio, has larvae that are atypical withiin the genus; they have very long maxillary palps and do not have the broad medial lobe on the labial palps found in other North American species]
2. Labrum submarginal setae simple. . . . . . . . . . . . . . . . . . . . . . Labiobaetis propinguus
Labrum submarginal setae branched. Planate mandible either without prominance between mola and incisors or with only slightly rounded prominence. . . . . Labiobaetis dardanus
Key to Labiobaetis Nymph Species