. Bulletin. Natural history; Natural history. May, 1953 Burks: The Mayflies of Illinc 85. Fig. 199.—Leptophlebia sp., mature nymph, dorsal aspect. palps has three segments. Each antenna is longer than the head and thorax combined. Each tarsal claw has two rows of ventral denticles, a long row from base to near the tip on the outer side, and another, shorter row near the tip on the inner side. Gills of the first abdominal segment are bifid and filamentous, fig. 1935; the gills on segments 2-7 are double and lamelliform, figs. 193^^ and C, each lamella having a terminal, fila- mentous extension.
. Bulletin. Natural history; Natural history. May, 1953 Burks: The Mayflies of Illinc 85. Fig. 199.—Leptophlebia sp., mature nymph, dorsal aspect. palps has three segments. Each antenna is longer than the head and thorax combined. Each tarsal claw has two rows of ventral denticles, a long row from base to near the tip on the outer side, and another, shorter row near the tip on the inner side. Gills of the first abdominal segment are bifid and filamentous, fig. 1935; the gills on segments 2-7 are double and lamelliform, figs. 193^^ and C, each lamella having a terminal, fila- mentous extension. Each of the three caudal filaments is slightly longer than the head and body combined. In this genus, specific characters for the females and nymphs have not yet been found. KEY TO SPECIES Adult Males 1. Abdominal tergites 2-7 white, with dark spiracular dots 1. johnsoni Abdominal tergites 2-7 partly or almost completely covered by dark brown shading on a tan background 2 2. Fore wing with apical one-fourth to two- fifths shaded with brown, fig. 185; oc- casionally a spot at outer apical angle of wing hyaline 2. nebulosa Fore wing completely hyaline except for faint, brown shading in stigmatic area, fig- 186 3. cupida 1. Leptophlebia johnsoni McDunnough Lcptuplilehia jo/insoni McDunnough (1924c-: 73). Blasturus gracilis Traver (I932rt: 133). —Length of body and of fore wing 8-9 mm. Head very dark, glossy brown, with eyes slightly lighter brown. Thorax dark brown to black on dorsum and light brown to tan on pleura and sternum; wings hyaline, with veins and most crossveins dark brown, and each fore wing with a light brown cloud covering stigmatic and outer apical areas. Abdominal segments 2-7 white, with dark brown, or black, spiracular dots and tan ganglionic marks; segments 8-10 dark brown; genital forceps white, penis lobes yellow; caudal filaments tan, with articulations dark brown. Known from Connecticut, Massachusetts, New Hampshire, New York, North Caro- lina, O
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