New Species And Records Of Neoperla (Plecoptera: Perlidae) From Vietnam Author Stark, Bill P. and Ignac Sivec & Box 4045, Department of Biology, Mississippi College, Clinton, Mississippi, U. S. A. 39058 E-mail: stark @ mc. edu stark@mc.edu Author Sivec, Ignac Slovenian Museum of Natural History, Prešernova 20, P. O. Box 290, SLO- 1001 Ljubljana, Slovenia E-mail: isivec @ pms-lj. si isivec@pms-lj.si text Illiesia 2008 2008-03-20 4 3 19 54 journal article http://doi.org/10.5281/zenodo.4758856 564cead7-264a-4ee4-b5ee-15fd3ba81657 1854-0392 4758856 Neoperla Vn ‐ B ( Figs. 85‐87 , 127‐129 ) Material examined. Vietnam : Dong Nai , Cat Tien National Park , near park headquarters, 120 m , 22 August 1998 , 11° 25’ 9” N , 107° 25’ 41.5” E , B. Hubley , D. Currie , ROM 982002 , 1 ♀ ( ROM ) . Adult habitus. Biocellate. Head pale with slightly darker area covering central frons from ocelli to near antennal bases ( Fig. 85 ). Pronotum pale brown with darker rugosities. Wing membrane pale veins amber to pale brown. Femora and tibiae pale. Female. Forewing length 13 mm . Subgenital plate a small triangular tab ( Fig. 87 ). Vagina lined with golden brown scales forward of spermathecal base ( Fig. 86 ). Spermathecal stalk long, partially coiled and lined rather completely with fine golden brown scales. Egg. Barrel shaped. Length ca. 0.33 mm, width ca. 0.17 mm, collar width ca. 0. 06‐0.07 mm. Collar sessile and surrounded by 1‐2 rows of large, irregularly shaped, impunctate cells; rim narrow and smooth; base of collar ringed by a distinct, irregular ridge ( Figs. 127‐129 ). Striae wide, ca. 17 visible in lateral aspect; striae separated by narrow punctate sulci. Lid small, covered with fine punctations throughout, follicle cell impressions obscure. Figs. 85‐87. Neoperla Vn B. 85. Head and pronotum, 86. Vagina and spermatheca, 87. Female terminalia. Figs. 88‐93. Egg micrographs. 88‐90. N. cavaleriei . 88. Egg, 89. Collar, 90. Lid. 91‐93. N. clara . 91. Egg, 92. Collar, 93. Lid. Figs. 94‐99. Egg micrographs. 94‐96. N. hamata . 94. Egg, 95. Collar, 96. Lid. 97‐99. N. hubleyi . 97. Egg, 98. Collar, 99. Lid. Figs. 100‐105. Egg micrographs. 100‐102. N. idella . 100. Egg, 101. Collar, 102. Lid. 103‐105. N. leptacantha . 103. Egg, 104. Collar, 105. Lid. Figs. 106‐111. Egg micrographs. 106. N. mnong . 106. Egg, 107‐108. N. tamdao . 107. Egg, 108. Collar. 109‐111. N. nebulosa . 109. Egg, 110. Collar, 111. Lid. Figs. 112‐117. Egg micrographs. 112‐114. N. song . 112. Egg, 113. Collar, 114. Lid. 115‐117. N. spinaloba . 115. Egg, 116. Collar, 117. Lid. Figs. 118‐123. Egg micrographs. 118‐120. N. teresa . 118. Egg, 119. Collar, 120. Lid. 121‐123. N. yao . 121. Egg, 122. Collar, 123. Lid. 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. Diagnosis. This unassociated member of the clymene complex is distinctive by virtue of the triangular subgenital plate, and the wide chorionic striae of the egg. The latter feature is reminiscent of N. coosa and N. osage from the Nearctic region ( Stark & Lentz 1988 ; Smith & Stark 1998 ). Males of N. sinuata and N. gordonae were collected with this female but the former species has a distinctive head pattern not shared with this species, and the female of the latter species is known. If this female should at some future time be associated with the male identified as N. gordonae from Cat Tien National Park, that would support the argument, presented above, that N. gordonae represents a species complex.