Ohio Mayflies

1.         Abdominal segment I always with pair of well-developed, tapered, or clavate ventrolateral gills             (Fig. 1.1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

            Abdominal segment I usually without ventrolateral gills (Fig. 1.2). . . . . . . . . . . . . . . . . . . . . 3

2.         Head largely or entirely reddish brown to dark brown, with or without small light-colored patch             on frontoclypeus (Fig. 1.3); abdomen with dorsal gills at least 0.5X length of ventral gills                         (Fig. 1.4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

            Head reddish orange except for reddish-brown stripes dorsolaterally joined posteriorly and                         sometimes also anteriorly (Fig. 1.5); abdomen without lateral gills, with dorsal gills                                     usually less than 0.5X length of ventral gills, or dorsal gills absent (Fig. 1.6). . Neophylax oligius

3.         Head uniformly orange yellow to orange brown; frontocllypeus often with short medium                         tubercle (Fig. 1.7); pronotum anteromedially with microsculpter of relatively short spicules                         arranged in transverse rows, laterally with longer, evenly distributed spicules; (Fig. 1.8);                         abdomen usually with lateral gills on at least segment III (Fig. 1.9). . . Neophylax concinnus

            Head more or less uniform in color (Fig. 1.10); abdomen with lateral gills on segments II-IV                         and sometimes V (Fig. 1.11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Neophylax fuscus

4.         Pronotal microsculpture of scales in transverse rows, mostly wedge-shaped except antermedial             scales with serrate leading edges (visible only with compound microscope, scales/spicules often             broken away near bases). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Neophylax wigginsi

            Protoal microsculpture of slender spicules in transverse rows anteromedially or uniformly                         distributed. Head with dorsum almost to occipital foramen somewhat darker than rest of head;             mesonotum with conspicuous microsculpture of stout spicules. . . . . . . . . Neophylax ayanus

*Ohio EPS does not carry this genus to species.