Loisirella xanthosa sp. nov.

(Figs. 1–13)

Type material. Holotype male (INPA). BRASIL: Amazonas, Ipixuna, Com [unidade] Lago Grande, Rio Gregório, 07˚21’46.7”S–71˚52’07.1”W, 12.v.2011, 19:00–22:00h, Arm [adilha] Luminosa baixa, J.A. Rafael, J. T. Câmara, R. F. Silva, A. Somavilla, C. Gonçalves, A. Agudelo, leg.

Condition of the holotype: In perfect condition.

Paratypes: BRASIL: Amazonas, Ipixuna, Rio Liberdade, Estirão da Preta, 07˚21’46.7”S –71˚ 52’07.1”W, 13.v.2011, 04:00–06:30h, Arm [adilha] Luminosa dossel, J.A. Rafael, J. T. Câmara, R. F. Silva, A. Somavilla, C. Gonçalves, A. Agudelo, leg (1 ♀, INPA); idem, except 13–14.v.2011, 22:00–1:00h, Arm[adilha] Luminosa baixa (1 ♂, INPA) .

Measurements: Body length: male 2.4–2.6 mm (4.5–4.6 mm including wings) (N=2); female 2.4 mm (4.4 mm including wings) (N=1). Forewing length: male 4.0– 4.1 mm (N=10); female 4.0 mm (N=1).

Diagnosis. Frons predominantly brown (Fig. 3). Forewing with basal half yellowish brown and apical half dark brown with white areas (Fig. 1). Lateral longitudinal carinae of mesonotum strongly marked (Fig. 4). Pygofer with pair of spiniform projections on dorsal region of posterior margin (Figs. 7–9). Periandrium with two retrorse spines (Fig. 11, S 1 and S2).

Description. Coloration. General body color brown with yellow regions (Figs. 1–5). Lateral carinae of the frons above lateral ocelli, vertex, rostrum, pedicellus, median region of pronotum, tegula, epimeron, and episternum yellow. Forewing with basal half light brown and apical half dark brown, with translucid regions: two white regions within the postcostal cell; white region at apex of the subcostal cell; white rounded region at apex of the C1 cell; small white region at apex of C1a cell; long white region within Radial cell; small white region at apex of C2’cell; C3 cell white; large white region at apex of C3a, C3’, C3b and C3c cell; white region near apex of C4’ cell; C5’ cell predominantly white; white region at apex of cubital cell (Fig. 6). Pterostigma dark brown. Hind wing brown. Legs yellow, except all femora light brown. Abdomen brown, except upper half of sternites III, IV, V, anal segment, pygofer, and genital style, yellow.

Head: Frons approximately 1.5 times as long as broad; median carina of frons absent; lateral carinae weakly directed obliquely laterally (Fig. 3). Pedicellus as long as wide and scape inconspicuous in anterior view (Fig. 3). Thorax: Pronotum with lateral carinae divergent anteriorly in dorsal view; posterior margin concave with deep median notch. Mesonotum with lateral longitudinal carinae present, strongly marked; median longitudinal carina absent (Fig. 4). Forewing with sc-r cross-vein after first bifurcation of radial vein; MP 3 + 4 and CuA 1 veins touch each other for a short distance; short icua cross-vein, half length of icu cross-vein; apical half of the CuA 1 vein arched; Pcu+A 1 vein approximately half length of Pcu vein (Fig. 6). Legs with metatibia with 6 apical spines; metatarsus with 7+7 apical spines. Other structural characters as in generic description.

Male terminalia (Figs. 7–12): Pygofer with pair of spiniform projections on posterodorsal margins of lobes; small lateral lobe near middle region in lateral view (Figs. 7, 10); medioventral process robust, conical, in lateral view, with posterior margin triangular in ventral view (Figs. 8, 9). Gonostyli symmetrical, curved up in lateral view; inner margin sinuous, divergent and rounded apex in posterior view (Figs. 9, 10). Phallic complex robust, with almost straight periandrium bearing two retrorse spines near apex, and one small triangular lateral projection at median region (Fig. 11), spines as follows: one slender, elongated, and curved anteriorly inserted at apex (Fig. 11, S 1) and another slender, elongate, almost straight, ventrally directed, inserted near base (Fig. 11, S 2). Aedeagus robust with membranous projections at apex and three spines (Fig. 12), spines as follows: one long, slightly sinuate spine inserted near base (Fig. 12, S 3) and two short, slender, and almost straight apical spines (Fig. 12, S 4 and S5). Anal tube robust, subpentagonal in dorsal view, dorsal margin almost straight in lateral view; ventral margin abruptly folded down ventrally at apex in lateral view; base approximately subequal to length of anal tube extension in lateral view; apex truncated in posterior view (Figs. 7–10).

Etymology. From the Greek xanthos, yellow. The species name is allusive to the yellow coloration of tibiae.

Distribution. Brazil (Amazonas) (Fig. 13).

Taxonomic notes. Loisirella xanthosa sp. nov. can be promptly distinguished from Loisirella erwini by the general color of wings and body and mesonotum with lateral longitudinal carinae strongly marked. Furthermore, the genitalia are quite distinct, the new species having pygofer with a spiniform projection on posterodorsal margin of each lobe and phallic complex with periandrium bearing two spines near apex and one small triangular lateral projection at median region and aedeagus with three spines.