3541 Author Judson, Sarah W. Author Nelson, C. Riley text Zootaxa 2012 2012-11-06 3541 1 118 journal article 1175­5334 505937B0-9F57-4068-82E6-8553826DD5AA Mesocapnia variabilis (Klapalek, 1920) SYNONYMY Capnia variabilis Klapálek, 1920 Mesocapnia variabilis Zwick, 1973 TYPE LOCALITY: North Siberia: Yakutsk, Jakutien. DIAGNOSIS: Mesocapnia variabilis males and females are macropterous ( Fig. 76 ), and therefore are superficially similar to M. silvatica . The male epiproct has a pronounced swollen bulb towards the base ( Fig. 77 ), which is visible from both dorsal ( Fig. 77 ) and lateral ( Fig. 78 ) aspect. The epiproct of M. variabilis narrows noticeably following the swollen bulb and then widens again before gradually tapering to a point ( Fig. 77, 78 ). Other Mongolian Mesocapnia have epiprocts of relatively uniform width ( Fig. 68 ), with the exception of narrow apices. The female subgenital plate is broadly rounded ( Fig. 79 ) similar to M. silvatica from which it cannot be sepearated consistently. The nymphs are indeterminable to genus or species. DISTRIBUTION—Global: Holarctic- Regional: AOB, IDB- Aimag: AR, BO, KhG, TO, UB*, UV*, ZA^. DISCUSSION: Historical specimens of M. silvatica from previous MAIS expeditions that we validated were clearly M. variabilis . This continues to call the validity of M. silvatica into question.