(Figs. 1 a, 2 a – k, Map 1)
Leptusa opaca Casey, 1893: 364; Fenyes, 1920: 123; Bernhauer & Scheerpeltz, 1926: 555; Pace, 1989: 130; Gusarov, 2003: 118; Klimaszewski et al., 2005: 46; Klimaszewski et al., 2007: 815, 826; Gouix & Klimaszewski, 2007: 61. Leptusa seminitens Casey, 1893: 364; Bernhauer & Scheerpeltz, 1926: 555 (as synonym of L. opaca).
Material examined (n= 2). U.S. A: Tennessee: Sevier Co.: ɗ, GSMNP, Twin Creeks, FIT #1, 26 June – 1 July 2001, C. Carlton, V. Moseley, A. Tishechkin (LSAM); North Carolina: Haywood Co.: Ψ (slide mounted), GSMNP, AHSLC @ Purchase Knob, FIT, 17 S 312021 3940123, 17 August 2005, T. Grannan (GSMNP).
Redescription. Length 3.1 – 3.2 mm. Head, pronotum, and elytra blackish brown; antennomeres 1 – 2, 11, mouthparts, tibia, tarsus, and posterior part of abdominal tergites II – V yellowish brown; femora brown (Fig. 1 a). Head opaque, pubescent, with microsculpture. Antennomeres 1 – 3 elongate, 4 – 5 longer than wide, 6 – 7 subquadrate, and 8 – 10 transverse (Fig. 2 a). Carina on each side of ventral surface of head complete, attaining gular suture.
Mouthparts. Labrum transverse, bearing 3 pairs of short setae, and 7 pairs of long setae, a-seta, b-seta, and many pores (Fig. 2 b). Labium with two distal setae in a longitudinal row, and several pores in median area; a pair of setal pores, 2 pairs of real pores and several pseudopores present in lateral area (Fig. 2 c). Labial palpi bearing 12 setae (a – h, α – δ), γ-, δ-seta at least three times longer than α-, β-seta (Fig. 2 d). Mentum trapezoidal, bearing 4 pairs of main setae (b, u, v, w), and 3 pairs of additional setae; many pores present in middle area (Fig. 2 e).
Thorax. Pronotum approximately 1.61 times wider than long, pubescent, opaque, with microsculpture. Mesoventrite with distinct reticulate microsculpture. Metaventrite with setigerous punctures. Elytra wider than pronotum and abdomen, approximately 1.62 times longer than wide, approximately 1.95 times longer than pronotum, latero-posterior margin emarginate, opaque, and pubescent. Hind wings present.
Abdomen. Abdomen glossy, as wide as elytra. Abdominal tergite VI approximately 1.79 times wider than long; tergites VII – VIII with single median elongate tubercle (Fig. 2 f); tergite VIII with posterior margin shallowly emarginate, bearing 4 pairs of main setae, and many additional short setae and pores (Fig. 2 f). Male abdominal sternite VIII with posterior margin produced and approximately bearing 15–16 main setae, and many additional short setae and pores (Fig. 2 g). Female abdominal tergite VIII with posterior margin shallowly emarginate, bearing 4 pairs of main setae, and many additional short setae and pores (Fig. 2 h).
Genitalia. Paramere as in Fig. 2 i. Median lobe as in Fig. 2 j. Spermatheca as in Fig. 2 k.
Type locality. Leptusa opaca: Pennsylvania.
Distribution. CANADA: New Brunswick, Nova Scotia, Ontario, Prince Edward Island, Quebec; USA: Arkansas, Georgia, New York, North Carolina, Pennsylvania, Rhode Island, Tennessee, Wisconsin. Locations where L. opaca has been collected in GSMNP as in Map 1.
Habitat. Both specimens were collected from secondary forests during mid to late summer using flight intercept traps.