Mayfly Species Sparbarus lacustris (Angler's Curses)

Mesonotum pale brown; fore femur dark black-brown; abdominal tergites pale, the posterior margins black.

Eyes dark; lateral ocelli transparent; vertex pale in the median area, dark cinnamon brown toward the eyes. Pronota and mesonota pale brown, pleura paler; a narrow dark transverse line between the fore coxae; anterior portion of mesosternum dark piceous; metasternum paler, with a dark piceous transverse band. Fore legs longer than body; femora dark blackish brown. Middle and hind legs entirely pale; femora about as long as tibiae and tarsi combined. Wings whitish, especially toward the posterior margin; subcosta and radius dark piceous in the basal two-thirds of their length. Abdominal tergites 4-10 pale, the posterior margins blackish. Sternites pale, with dark lateral spots on some of them. Tails whitish. Forceps longer than in B. prudens (now a synonym of Susperatus prudens).

This species is larger than B. prudens or B. flavus (now a synonym of Sparbarus flavus), and has longer forceps, as well as black posterior margins on the abdominal tergites which are not present in those species.

Only the nymph of this species is known; it may be that this is really the nymph of B. idei.

Nymph apparently without tubercles on the prothorax, such as are present in B. nitidus. General color pale. A pair of zigzag bands on the vertex, from eyes to middle of occiput. Prothorax wholly pale. Mesonotum darker at anterior and posterior margins; curved black median pencilings. Legs pale, each joint with a single brown submedian band. “Basal black mid-dorsal triangles” on "segments in front and rear"; (Ndm.); middle segments obscurely brownish. Anterior margin of each segment, dorsally and ventrally, brownish, paler in the median area; a pair of black dashes on the posterior portion of tergite 10. Tails wholly pale, but with faintly brown joinings in the distal portion, at least of some specimens.