Mayfly Species Spinadis simplex

A yellowish white species, as opposed to the general brown coloration of Anepeorus rusticus.

Head yellowish; eyes of living insect bright greenish yellow above and below; ocelli black-ringed at base. Thoracic notum flesh-colored; remainder of thorax yellow with distinct pinkish tinge. Legs white; femora yellowish; apex of fore tibia and tarsal joinings, and the “extreme tips of all the tarsi” (Walsh) brownish. Wings hyaline; all veins fine except cross veins in apical portion of costal space, which are coarse. Cross veins in basal portion of costal space very fine, indistinct, lacking in basal 1/5 of space, except for humeral cross vein. Veins in apical two-thirds of fore wing brownish; all others hyaline (Walsh says, all costal cross veins occasionally brownish). Abdominal segments 2-7 hyaline whitish, immaculate; segments 8-10 opaque, yellowish; in our Georgia specimen, tergites distinctly tinged with rose, especially on posterior margins of 9 and 10. Genitalia yellowish. Lateral apical portion of penes with two large and one smaller lobe on each side. Tails white, dusky at tips. Genitalia as in fig. 112.

The general pale coloration of this species distinguishes it at once from A. rusticus, the only other species thus far known in the genus.