Sogda enigma Peck & Cook, 2009

Peck, Stewart B. & Cook, Joyce, 2009, Review of the Sogdini of North and Central America (Coleoptera: Leiodidae: Leiodinae) with descriptions of fourteen new species and three new genera, Zootaxa 2102 (1), pp. 1-74 : 30-31

Sogda enigma Peck & Cook , new species

( Figs. 68 , 75–78 )

Type material. Holotype: ♂ ( CMNC). CANADA : Ontario: Stittsville, D.A. Smith’s woods, 18.X–11.XII.1979, S. Peck, forest malaise trough . Paratype (1): UNITED STATES: Maryland: Cabin John Ravine , 1.IX.1920, R.C. Shannon, ♂ ( USNM) .

Diagnostic description. Shining, reddish brown except elytra which are yellowish with narrow darker lateral margins. Length of pronotum + elytra = 2.6–2.9 mm (males). Head irregularly, sparsely punctate. Pronotum widest near middle, sides obtusely rounded at middle, basal angles obtuse; ratio length:width = 1:1.4; coarsely, irregularly punctate, with reticulate microsculpture. Elytra of medium length, wider than pronotum, ratio length:width = 1:0.7; with 9 coarsely, closely punctate striae; stria 1 clearly impressed, remaining striae weakly or not impressed; intervals irregularly punctate. Antennal club ( Fig. 75 ) moderately broad, ratio club width:length = 1:2.8; width ratio of antennomeres 7:8:9 = 1.3:1:1.7. Mandibles not dissected; apex of right mandible slender, unidentate; apex of left mandible broad, unidentate. Profemur and mesofemur of male unarmed; male metafemur ( Fig. 77 ) with posterior margin serrulate, tooth before apex. Male protibia ( Fig. 76 ) widened and concave dorsally at apex, with elongate, sinuate spur; male mesotibia weakly widened apically; male metatibia ( Fig. 77 ) angulate at about basal one-fourth of inner margin, narrow at base, widened in apical three-fourths; all tibiae spinose on outer margins. Male. Aedeagus ( Fig. 78 ) with median lobe broad, narrowing to very thin, broadly rounded apex. Parameres short, reaching apex of median lobe, slender, with inwardly angled apices and two apical setae. Female. Unknown.

Distribution. The species is known only from two localities in eastern North America ( Fig. 68 ).

Field notes, habitats and seasonality. The holotype was taken in a mature maple forest in a flight intercept trap in fall or early winter.

Etymology. The epithet enigma (from Latin aenigma, puzzle) refers to our initial difficulty in the generic placement of this species.

Figures

FIGURE 68. Known North American localities of Stereus arenarius (asterisks), Sogda obtusa (black dots), Sogda enigma (open squares).

FIGURES 75–78. Sogda enigma. 75. Right antenna, dorsal view. 76. Male right protibia. 77. Male right metafemur and metatibia. 78. Aedeagus, dorsal view. Scale bar = 0.3 mm (Fig. 78), 0.4 mm (Fig. 76), 0.5 mm (Fig. 75), 0.75 mm (Fig. 77).