Stonefly Species Sweltsa coloradensis (Sallflies)

Source: Two New Stonefly Species In The Sweltsa Coloradensis (Banks) Complex (Plecoptera: Chloroperlidae)

(Figs. 1 - 15, 36 - 37, 42, 45) http: // lsid. speciesfile. org / urn: lsid: Plecoptera. speciesfile. org: TaxonName: 3555Source: Two New Stonefly Species In The Sweltsa Coloradensis (Banks) Complex (Plecoptera: Chloroperlidae)

Adult habitus. Described by Needham & Claassen (1925). Male forewing length 7.0 - 7.5 mm, female 8.5 - 9.0 mm. Head and pronotum pale yellow with dark markings; ocelli connected by a V-shaped dark brown mark, M-line and anteromedian area of head forward of M-line dark brown. Pronotum pale yellow with almost complete dark brown margins and rugosities (Fig. 42). Abdomen brown with subtle, slightly darker median brown stripe. Cerci pale, antennae pale basally but brown in apical two thirds. Wing membrane pale, veins pale brown. Male epiproct (n = 12). Maximum width 320 - 370 µm, length 360 - 450 µm. Base relatively narrow, but gradually expanded beyond cowl, and reaching maximum width across lateral projections of epiproct body. Shoulders project conspicuously beyond hook base (Figs. 1 - 13, 45). Aedeagus (n = 3). Length 500 - 524 µm, width 590 - 760 µm. Entirely membranous; apex with a pair of small finger-shaped lobes in a parallel or V-pattern, apicolateral margins, each bearing a large, projecting, rounded lobe, and mesoventral area with a pair of eye-like lobes (Figs. 14 - 15); Finger shaped lobes bear scattered setae of variable length, apicolateral lobes bare; mesoventral lobes bare, but each with a transverse groove. Median ventral field below mesoventral eye-shaped lobes with a low nose-like tubercle.

Female subgenital plate. Posterior margin of plate projecting over basal third to half of sternum 9; plate truncate, to slightly concave along posterior margin. Plate usually darkly pigmented over most of surface, contrasting with the pale sternum 9 and the pale basal and lateral areas of sternum 8 (Figs. 36 - 37).