Ohio Mayflies

Note: All references except Ohio EPA classify Ceratopsyche as Hydropsyche.

1.         Checkerboard pattern on frontoclypeus (Fig. 1.1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2**

            Frontoclypeus with other patterns or unicolored. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.         Posterior angle of frontoclypeus with three distinct spots (Fig. 1.2). . Ceratopsyche morosa**

            Posterior angle of frontoclypeus with only a single large spot (Fig. 1.3). . . . . . . . . . . . . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ceratopsyche bronta (Central Form)

3.         Head with three distinct stripes; central stripe occasionally with yellow spot in middle; each                         notum with distinct anterior and posterior dark band. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ceratopsyche bronta (Appalachian Form)

            Head and thorax lacking striped color pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4.         Head and thoracic sclerites with dark brown to black background color; frontoclypeus with either             distinct central spot(s) (Fig. 1.5) or pair of diagonal spots on anterior portion of sclerite (Fig.1.6).             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ceratopsyche slossonae

            Head and thoracic sclerites straw brown to bronze; pattern of frontoclypeus different than that             above. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

5.         Frontoclypeus with three indistinct pale spots; one centrally located, others anteriolateral of it.             (Fig. 1.7) Thoracic nota with many conspicuous, thick, short briastle-like setae. Club hairs of             abdomen less dense and only slightly thicker than regular hairs. . .. . . . Ceratopsyche sparna

            Frontoclypeus unicolored (Fig. 1.8). Thoracic nota with bristle-like setae fewer and not very                         conspicous. Club hairs of abdomen more dense and conspicuously thicker than regular hairs. . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ceratopsyche ventura

* Schuster & Etnier (1978) use an older taxanomic name, Symphitopsyche for Ceratopsyche.

** OEPA classifies all Hydropsychidae with a checkerboard pattern on the head as Ceratopsyche morosa group, which would include the Central Form of Ceratopsyche bronta.