10. Prostoia hallasi Kondratieff & Kirchner, 1984

Swamp Forestfly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org:TaxonName:6098

(Figs. 69‒76)

Prostoia hallasi Kondratieff & Kirchner 1984:579 . Holotype male (United States National Museum), Washington Ditch, City of Suffolk, Virginia, USA

Prostoia hallasi: Kondratieff & Kirchner, 1991:215

Prostoia hallasi: Grubbs et al., 2014:18

Prostoia hallasi: Stark, 2017:214

Distribution. USA: CT, GA, IL, MA, NC, VA (DeWalt et al. 2022)

Male. Macropterous. Body length 4.8–5.2 mm, forewing length 4.9–5.5 mm (n = 2). Gills absent. Cerci simple and unsclerotized (Figs. 69‒70). Paraprocts with lightly sclerotized, undivided lobes. Epiproct ventral sclerite sclerotized throughout length, narrow in both dorsal and lateral profiles, and fully recurved over abdomen (Figs. 69‒71); base parallel-sided for ca. ½ of length (Figs. 69, 74); tip with subterminal excavation anterior to complex, paired ventrallydirected processes (Figs. 70, 72‒73); dorsal sclerite reduced to basal area, lacking lateral arms (Fig. 70).

Female. Macropterous. Body length 4.8–6.1 mm, forewing length 6.2–6.9 mm (n = 6). Gills absent. Cerci simple and unsclerotized. The 7 th and 8 th sterna separate medially (Fig. 75‒76); the 8 th sternum is modified slightly as a subgenital plate, with small notch and lightly-sclerotized area medially (Figs. 75‒76).

Larva. Briefly characterized by Kondratieff & Kirchner (1984) as morphologically indistinguishable from P. completa and P. similis . Stark (2017) provided a partial illustration of the tibia.

Comments. Prostoia hallasi has a unique distribution compared to the other eastern Nearctic Nemourinae . To date, most records are from Atlantic Coastal Plain regions of five eastern US states but nothing yet from coastal areas of Florida west to Texas (DeWalt et al. 2022). What makes the distribution especially unusual was the recent and unexpected discovery of two populations from southern Illinois (Grubbs et al. 2014).