Mayfly Species Habrophlebiodes annulata

This is a slender, reddish-brown species, with black-ringed abdomen. Head and thorax black above, reddish brown on the sides and beneath. Femora rufous on the fore legs, brownish on the others; all legs becoming pale straw-yellowish on the tarsi. Wings hyaline with brown longitudinal veins and with no visible cross veins except in the stigmatic area, where they are very few (6 to 8), simple, strongly aslant, and incomplete at their subcostal ends.

Abdomen distinctly ringed with black all around the apical margin of the abdominal segments. Pattern almost lacking, but there is an obsolete middorsal pale hair line, bordered by equally obscure lines of black, and there is another obscure black hair line on the lateral margin. Midventral areas, paler brown. The prolonged 9th sternite is deeply divided by a narrow cleft into two very blunt-tipped lobes. Forceps red-brown. Penes tawny (see fig. 142).