Mayfly Species Nixe lucidipennis

Mesonotum dark brown; abdominal tergites largely brown; genitalia of the lucidipennis type.

Frontal portion of head very slightly shaded with brown; vertex dark brown or reddish. Thoracic notum dark brown; pleura and sternum light yellowish. Femora of fore leg dark, those of the middle and hind legs yellowish. Basal joint of fore tarsus about 1/4 the length of the second; in the hind leg, the basal tarsal joint is distinctly longer than the second joint, all joints of this tarsus being relatively long for the size of the species. Wings hyaline; longitudinal veins slightly dusky, especially the costa and subcosta; cross veins wholly colorless. Abdominal tergites blackish brown, by the original description; Dr. McDunnough states that this species has paler coloration than H. rusticalis (now a synonym of Nixe rusticalis), and with less distinct markings. Sternites pale. Forceps base and penes yellow; forceps tinged with black. Tails pale, the basal portion tinged slightly with black. Penes with a prominent inner apical projection or lobe; on the ventral surface of each division of penes is a rather prominent spine (see fig. 97). In H. rusticalis, the inner apical lobe is not so well developed, and the spines on the ventral surface are usually lacking.