Mayfly Species Parameletus croesus (Gray Drakes)

Head of male yellowish; ocelli black-ringed; median carina marked with black. Thorax dull brown. Mesonotum shaded with yellowish anteriorly, especially along the median line. A broad black oblique line on pleura from base of fore wing forward to the lateral margin of the prothorax. Scutella blackish, the surrounding areas shaded with pale orange. Fore legs deep brown; femur paler at apex and along the upper margin. Middle and hind legs dull olive brown with darker tarsi. Wings hyaline, venation dark. Fore wings clouded with brownish over the inner two-thirds of their length, except for the costal half of the extreme base, which is pale. Brownish shading along the costa of the hind wing.

Abdomen dull brown dorsally, with pale antero-lateral patches, triangular in shape. On the basal segments these pale areas are indistinct and semi-transparent; on the apical segments they are bright yellow and opaque, being especially prominent on tergite 10. Subdorsal dark streaks present, more or less obscure on the basal segments. Sternites yellowish. A large brown triangular patch occupies most of each sternite except the anterior margin and the antero-lateral angles. Sternite 9 brown except for a small yellow anterior triangle. Forceps base and forceps brown. Forceps base quite deeply excavated apically. Tails black-brown with darker joinings.

Head of female with a dark frontal band and dark submedian streaks on vertex and occiput. No brown shading on the wing.