Stonefly Species Bolshecapnia spenceri (Little Snowflies)

Source: A Review Of The Genus Bolshecapnia Ricker, 1965 (Plecoptera: Capniidae), And Recognition Of Two New Nearctic Capniid Genera

Male epiproct (n = 6). Length 524 - 543 µm, width at mid-length 224 - 250 µm, greatest width near base 295 - 300 µm. Sclerotized hooks arise subapically from either side of the median groove, and are bent sharply laterad, and extend beyond the lateral margins of the epiproct body (Figs. 25 - 29); tips of basolateral hooks extend forward for about 0.75 of the total epiproct length. Median groove wide near apex, narrowing gradually to the widest point near the epiproct base (Fig. 26). Small clumps of spongy appearing tissue located along lateral margins near base of hooks (Figs. 27 - 28). Base of epiproct body bearing a pair of dorsal ridges separated by terminus of median groove (Figs. 27, 29). Apex with a protruding membranous process (Figs. 29 - 30). Tergal process (n = 3). Absent, but tergum 9 covered with a broad band of short, thick setae (Figs. 27 - 28). Vesicle (n = 1). Length = 219 µm, basal width = 214 µm, median width = 252 µm. Process relatively wide, slightly wider near mid-length (Fig. 31 - 32). Ventral surface covered with thick setae.

Female subgenital plate (n = 3). This structure is an apically narrowed, tongue-shaped process, about twice as wide at mid-length as near the apical margin (Figs. 33 - 34); the structure extends beyond the anterior margin of sternum 9 (see fig. 169 in Baumann et al. 1977), and is hairless except for a few scattered long setae on the basal half. Several variations in the structure are shown in figs. 15 - 16 (Ricker 1965).