Biguembia pulchra n. sp.

(Figs. 6A–I, 7 A-E, 8A-G)

Type material. Male holotype: BRAZIL, Tocantins, Peixe, 11 ◦ 59′32.0″S, 48 ◦ 31′55.7″W, 25-XI-2022, Krolow, T.K. & Equipe (INPA) .

Etymology. The specific name came from the Latin, pulcher which means beautiful.

Diagnos is: Biguembia pulchra n. sp. can be separated from other species by the basal region of 10Lp1 longitudinally excavated with internal tiptwisted in relation to 10L and external tip with only the base sclerotized (Fig. 6H, 7 C-D); 10Rp2 conspicuous, curved with a hook (Fig. 6H, 7 C-D).

Male (holotype, Fig. 6A–I, 7 A-E): general coloration (Fig. 6A and B), body predominantly dark brown with yellowish areas, except for the black head. Total length = 8.95 mm. Head (Figs. 6C and 7A), epistomal suture continuous and concave; ecdysial suture visible; post-ocular suture with two distinct elevation, width/length =1.09, small eyes, OR = 0.79; 3-2 incisor teeth and 1-1 M teeth. Antennae with 27 antennomeres dark brown. Mm and Sm defined; Mm trapezoidal; Sm rectangular, anterior margin more rounded and posterior margin depigmented with small prominence (convexity) in the center (Figs. 6D and 7B). Forewing length = 6.30 mm, hind wing length = 5.60 mm. Forewing (Fig. 6E), wing base union type A. C hirsute with white bristles; Ma1, Ma2 and Mp conspicuous, reaching the wing margin, in Ma2 and Mp, the final region is delimited by a row of bristles; external margin of the R1 vein reddish brown with central region less sclerotized; Rs+Ma with short connection about ¼ of the wing length; Ma with long bifurcation (more than ¼ of the wing length); Cua conspicuous, diffusely reaching the wing margin; Cu dark and well defined reaching the margin of the wing; vein A present and clear. Cross veins between C-R1: 3; R1-Rs 5; Rs-Ma1: 2; Ma1-Ma2: 1; Ma–Mp: 1. Hind wing (Fig. 6F): similar to fore wing, except for Mp reaching the wing margin and by cross-veins R1-Rs: 3, Rs-Ma1: 2, Ma–Mp: 1. Legs. Foreleg tricolor, coxa and trochanter brown in the proximal region and white distally, femur yellowish brown, tibia brown, tarsus yellowish brown. Middle leg, coxa and trochanter brown in the proximal region and white distally, femur, tibia and tarsus yellowish brown. Hind leg, coxa and trochanter brown, femur yellowish, white in ventral view, tibia and tarsus brown. Posterior basitarsus (Fig. 6G) narrow: length = 0.27 mm, width/length = 0.44 mm, medial bladder large and protuberant, diameter = 0.09 mm and diameter/tarsal width = 0.75; 2 rows of setae on the retrolateral face, 5 rows on the anterolateral face, 4 rows of setae on the ventrobasal face (Fig. 6G). Tympanal organ present, on foreleg femora as a semicircle, on middle leg femora as a long slender and curved band, absent on hind femur. Terminalia (Fig. 6H and I, 7 C-E): base of 10Lp1 excavated, with two points of the same length, internal tip twisted at the base, sclerotized, pointed and with a conspicuous longitudinal keel, external tip with only the base sclerotized and acute apex; 10Rp1 pointed with a longitudinal keel and apex curved towards the ventral region; 10Rp2 conspicuous, curved like a hook; Ep conspicuous and sclerotized; LC1dp with pronounced apical protuberance forming an obtuse angle towards the center of the body; H and Hp completely sclerotized but less marked at the apex; Hp with transverse keels; Lpp with excavated base, without microtrichia, very sclerotized with a long node; Rpp conspicuous; Longitudinal ratio of LC1/LC2: 0.71.

Female. (Paratype, Fig. 8 A – G): It differs from the male by quadrangular head (Fig. 8A–C) and color pattern, bicolored antennae, prothorax and mesothorax completely brownish yellow, tergites with yellow lateral margins (Fig. 8A and B). Total length = 14.00 mm (antenna to cercus), body size = 11.35 mm (without antenna). Head (Fig. 8C and D), quadrangular almost black. Width/length =0.80; eyes small, OR = 1.00; anterior margin of the clypeus straight; epistomal sulcus continuous; ecdysial suture and postocular visible; 20 antennomeres, scape, pedicel and basal flageromeres brownish yellow, medial flageromeres brown and apical flageromeres lighter; Mm like a “mustache” and ochre color. Sm similar to male except by ochre color (Fig. 8D). Femur of hind leg more enlarged than male (Fig. 8A and B). Basitarsus of hind leg large, length =0.32, width/length =0.31, medial bladder large and prominent, diameter/basitarsus width = 0.26; 2-3 rows of setae on the ventrobasal face, 1-2 rows of setae on the retrolateral face, 5 rows of setae on the anterolateral face. Tympanal organ present, on foreleg femora a curved, slender band and elongated, on middle leg femora as a long slender band, absent on hind femur. Terminalia (Fig. 8E–G): central plate grayish in posterior region and yellowish brown in anterior region. First valvifers brown with brownish apical tip turned to the second valvifers. Second valvifers and opening of the spermathecal oviduct inconspicuous. Longitudinal ratio of LC1/ LC2:0.80. Coloration of cerci: dark brown, except for the base of LC1 yellow brownish.

Additional records (paratypes). BRAZIL, Tocantins: same data as holotype from culture in lab. (1♀ CEUFT; 3♀ INPA; 1♀ MZUSP; 2♀ IFML); idem, Ranch of Tuca, (11 ◦ 59′37.3″S, 48 ◦ 31′51.9″W), 25-XI-2022, culture in lab, Krolow, T.K & Equipe (1♀ INPA) .