Stonefly Species Capnia inyo (Little Snowflies)

Source: Larvae Of Five Species Of The Winter Stonefly Genus Capnia (Plecoptera: Capniidae) From California, U. S. A.

Characters. Body length male 6.6 - 6.8 mm, female 6.9 - 7.2 mm. Light to medium brown dorsally, ventrum lighter, little pattern except underlying muscles or developing adult pigment (Fig. 15). Antennal segments 42 - 44, head capsule width male 0.72 - 0.75 mm, female 0.84 - 0.0.90 mm. Lacinia and mandibles as described for Capnia umpqua and Capnia ventura (Figs. 44 - 48, 50 - 53). Pronotum with setae scattered over surface and as a sparse marginal fringe (Fig. 15). Mesosternal Y-arms enclose a subtriangular area about 0.3 times the intercostal width (Fig. 16). Hind wing pads shallowly notched along inner margins (Fig. 15); inside forewing pad length male 0.96 - 0.99 mm, female 1.44 - 1.50 mm. Femora bear scattered surface bristles, and tibia with a silky outer fringe (Fig. 15). Abdominal segments with long surface hairs (Figs. 32, 33). Sexual dimorphism evident. Male 10 th tergum with 0.7 - 0.8 mm long tubular posterior extension in dorsal view (Fig. 15); underlying tubular developing epiproct visible in pharate individuals (Fig. 15); 10 th tergum in lateral view tubular and downcurved (Figs. 17, 34).

Female without posterior extension of 10 th tergum (Fig. 18). Cercal segments about 32; cercomeres with apical circlet of short and long bristles, longer dorsal and ventral bristle in lateral view, and no evident intercalary hairs (Fig. 35 - 37).