Mayfly Species Habrophlebia vibrans

This is a dainty little clear-winged mayfly with a line of large whitish triangles on the back of the abdomen, giving it a serrated appearance when viewed from the side. Head brown above, paler on the middorsal line. Antennae pale beyond the swollen basal segment. Eyes globular, not quite touching above. Synthorax fawn color, prothorax darker brown. Legs pale, darker and distinctly brownish on front femora and tibiae especially toward their distal ends. Wings whitish hyaline with only a tint of amber in the veins toward the base. Cross veins of the costal strip nearly wanting before the bulla, and only a few (8-10) short simple parallel ones in the stigmatic area.

Abdomen brown at the ends with large whitish crescents covering half of the dorsum of the purplish middle segments and with the apical segments tawny. Beneath, it is paler brown at the ends, becoming whitish under the middle segments. Forceps pale. Penes elongate, conic, separated by a deep V-shaped cleft, without apical teeth but with a very long gently outcurving spine-like reflexed spur that is as long as the penes (see fig. 142). Penes light brown. Tails whitish, with darker joinings on a few basal segments, best marked at apex of the second joint.

Described as H. pussila

Body length 4, wing length 4.5

Head and thorax reddish brown. Antennae greyish beyond their brown bases. Fore femur light reddish brown; tibia and tarsus yellowish, a reddish brown apical band on the tibia. Middle and hind legs whitish, darker at joinings of segments. Wings hyaline, venation wholly pale. Abdominal tergites reddish brown; sternites much paler. There are large paired white patches on tergites 3 to 6, and whitish lines parallel the side margins of segments 7 and 8. Tails yellowish white, Penes longer than in H. vibrans, with the cleft between them very narrow (see fig. 142).