Zynzus retus

Comprehensive Description

provided by Memoirs of the American Entomological Society
Zynzus retus Smith
Female. — Length, 6.0 mm. Black, pronotum and mesonotum orange with very small black spot on mesal area of pronotum and anterior margin of mesoprescutum. Wings uniformly moderately infuscated black; veins and stigma black. Antennal length to head width as 6.0:4.8. Lower interocular distance to eye length as 2.4:2.2; distances between eye and hindocellus, hindocelli, and hindocelli and posterior margin of head as 0.9:0.8:0.7. Length of hindbasitarsus to length of remaining tarsal segments combined as 2.0:2.8. Sheath with large leaflike scopae, in dorsal view longer than broad, in lateral view with dorsal margin straight and slanting downward, meeting ventral margin at narrowly rounded apex (similar to nigropectus, Fig. 683). Lancet clublike, serrulae small, with large annular spines, segments 4 to apex with about 6 large broad spines on each annulus and with large spines distant from ventral margin of lancet (Fig. 700).
Male. — Unknown.
Holotype.— F, "Orizaba, Ver., Mex., 8/12-22/61, R. and K. Dreisbach" (Champaign).
Paratype. — MEXICO: Tequesquitengo, Mor., 715-61, R. & K. Dreisbach (1 F) (East Lansing).
bibliographic citation
Poulton, B.C., Stewart, K.W. 1991. The Stoneflies of the Ozark and Ouachita mountains (Plecoptera). Memoirs of the American Entomological Society vol. 38. Philadelphia, USA