Neoperla Vn

Stark, Bill P. & Sivec, Ignac, 2008, New Species And Records Of Neoperla (Plecoptera: Perlidae) From Vietnam, Illiesia 4 (3), pp. 19-54 : 43

Neoperla Vn ‐ A

( Figs. 82‐84 , 124‐126 )

Material examined. Vietnam: Nghe An, ca. 25 km SW Con Cuong, Khe Moi River Forestry Camp, tributary of Khe Moi River , 308 m, 6 June 1995, 18° 56’ N, 104° 49’ E, B. Hubley, ROM 956172 , 2 ♀ ( ROM) . Same site but 4 June 1995, B. Hubley, J. Swann, ROM 956158 , 3 ♀ ( ROM) .

Adult habitus. Biocellate. Head mostly dark brown but with obscure pale areas forming incomplete Mline and surrounding tentoria ( Fig. 82 ). Pronotum dark brown. Wings tinted brown with darker veins and pale costal margin. Hind femora with dark brown basal and apical bands and pale mesal band, fore and mid femora dark brown.

Female. Forewing length 10‐11 mm. Subgenital plate scarcely produced and mesally emarginate ( Fig. 83 ). Spermathecal stalk very long and slender and lined for most of length with minute spinules ( Fig. 84 ).

Egg. Oval. Length ca. 0.33 mm, width ca. 0.17 mm, collar width ca. 0.09 mm. Collar short and slightly constricted basally with a thin, smooth rim ( Figs. 124‐ 126 ). Striae narrow, ca. 11 primary and 20 secondary striae visible in lateral apect; primary striae connect to collar rim and to follicle cell impressions on lid; secondary striae occur in pairs between primaries and become less prominent near poles. Sulci narrow with a single row of coarse punctations between any pair of striae. Lid small consisting of two rows of follicle cell impressions; FCIs deep, walls smooth, and with floors having ca. 9 punctations.

Diagnosis. See above for N. teresa .

Figures

Figs. 82‐84. Neoperla Vn A. 82. Head and pronotum, 83. Female terminalia, 84. Vagina and spermatheca.

Figs. 124‐129. Egg micrographs. 124‐126. N. Vn‐A. 124. Egg, 125. Collar, 126. Lid. 127‐129. N. Vn‐B. 127. Egg, 128. Collar, 129. Lid.