Psorus cassidiformis Bergroth, 1914

(Figs. 1–3, 14)

Psorus cassidiformis Bergroth, 1914: 425 .

Measurements. Body length: 14.5–15.2; head length: 2.7–3.2; head width: 3.2–3.7; pronotum width: 8.7– 10.3; pronotum length: 2,8–3.2; abdominal width: 8.8–10.8.

Male. Dorsal rim of pygophore with median third almost rectilinear. Median margins of posterolateral angles of pygophore almost rectilinear. Proctiger (segment X) as long as posterolateral angles of pygophore; apex of process of ventral wall obtusely rounded. Parameres hardly visible from dorsal side; in ventral view attaining middle of proctiger. Lateral margins of parameres almost rectilinear (Figs. 1–2).

Female (Fig. 14). Posterior margins of gonocoxites 8 slightly angulate; folded areas along lateral margins of gonocoxites 8 and median margins of laterotergites 8 more conspicuous than in P. paraensis, not obscured by the gonocoxites 8 (Fig. 3).

Material examined. Male, no data (AMNH). TRINIDAD: Maraval, B. W. I., female, 9.X.1921, W. Buthn, Lutz Collection 1961, Psorus cassidiformis Bergroth, Herbert Ruckes (NMNH). BRAZIL: Amazonas, Itamarati, Monte Calvário, 06° 07’ 29’’S, 68° 02’ 41’’W, male, 10–15.X.1999, Cristina M. Buhrnheim & Tomáz L. Gualberto col., a luz mista de mercúrio (UFRG); Coari, Rio Urucu, Igarapé Marta-3, 4°50’0,73’’S, 65°02’37’’W, female, 14–25.VII.1993, P. F. Bührnheim et al. col. (CZPB). PERU: Madre de Dios, Manu, Rio Manu, 250 m, Pakitza, 12°7’S, 70°58°W, 2 females, 9–3.IX.1988, Waine N. Mathis (NMNH); Pucallos, Rio Ucayali (200 m), female, I.1961, Dirings (MZSP).