Bebaiotes guianesus

Bebaiotes guianesus (Fennah, 1947)

(Figs 16A – E; 17A – G; 18A – E; 37F; 40C, D; 43)

Muirilixius guianesus Fennah, 1947:186, 187, 188 Figs 1a–b, 2 a–g.

Bebaiotes guianesus: Wilson 1989: 491.

Type material. Holotype female (NHM). BRITISH GUIANA: New River, 750–1000 ft., 15–25. v. 1938, C. A. Hudson labelled (examined by photography).

Condition of the holotype: Body glued on paper. Right forewing and hind wing glued on paper. Right hind wing damaged near the apex. Right and left flagellum broken and lost. Right prothoracic leg broken and lost. Right mesothoracic leg broken and lost. Right and left metathoracic legs broken and lost. Abdomen removed; genitalia dissected.

Additional material examined. BRASIL, Amazonas, Manaus, Reserva Ducke, 23.xi.1981, Malaise, J.A. Rafael col. (2 ♂, INPA); idem, x.2003, NS 2-800 m [e]t[ro]s azul, Arm. Suspensa 20 m [e]t[ro]s, A. Henriques et al., cols. (1 ♀, INPA); AM 010, km 26, 8.viii.1978, Armadilha Malaise (1♀, INPA); idem, 18.vii.1978 (1♀, INPA); idem, 18.vii.1978, CDC Light TRAP 1–2, Jorge Arias col. (1♀, INPA); Téfe, Terra firme, 8–20.iv.2017, 3˚25’19”S– 64˚37’05”W, Arm [adilha] Malaise, J.A. Oliveira, D.M.M. Mendes & J.A. Rafael cols. (1 ♂, INPA); Paleocanal, rio Cuieiras, Terra firme, 2˚51’10.2”S–60˚12’52.2”W, 01.x.2017, coleta ativa, M. Pilco col. (1 ♀, INPA).

Diagnosis. Posterior margin of pronotum and tegula pale yellow (Figs 16A, D). Median longitudinal carina of pronotum weakly marked (Fig. 16D). Forewing light brown with whitish regions. Ventral margin of periandrium with short indentation (Fig. 17G). Gonapophysis VIII (first valvula) with four projections on lateromedian margin and dorsal margin with irregular teeth (Fig. 18E).

Redescription (male and female). Measurements. Body length: male 3.1 – 4.1 mm (6.4 – 6.5 including wing) (N=2); female 3.3–4.8 mm (6.0 – 6.6 mm including wings) (N=2).

Coloration. General body color light brown (Figs 16A, B). Upper half of frons, pedicel plate organs, median region of pronotum, lateral and posterior margin of pronotum and tegula pale yellow (Figs 16C, D). Forewing semihyaline, dark brown with whitish regions and light yellow veins: wide, whitish diffuse spot in the basal region extending from the median region of the postcostal cell up to the CuP vein; long, wide, white diffuse band in the middle region extending from apical region of the postcostal cell to CuA 1 vein; long, wide, white diffuse band on apical region extending from apex RA vein up to the CuA 2 vein; narrow white stripe on apical region extending from to the MP1 vein up to the anterior cubital area (Fig. 40 C). Hind wing semihyaline, light brown with hyaline regions (Fig. 40D). Legs light brown. Abdomen light brown, except upper half of sternite III yellow brown (Fig. 16E).

Head: frons narrow, distance between the lateral carinae of frons on median portion, approximately 6 times smaller than maximum width of vertex (Fig. 16C). Clypeus approximately 4 times longer than its maximum width; median carina of clypeus strongly marked, does not touch epistomal suture, present on distal ¾ (Fig. 16C). Pedicel oblong, approximately 3 times longer than scape (Fig. 37F). Scape long without cuticular denticles (Fig. 37F).

Thorax: anterior margin of pronotum with tapered apex, lateral longitudinal carinae converging at an angle on anterior margin and subparallel to each other towards posterior margin; median longitudinal carina of pronotum present, but weakly marked; posterior margin of pronotum deeply concave in the middle; pronotum without pustules on posterior margin (Fig. 16D); median longitudinal carina of mesonotum present, strongly marked and lateral longitudinal carinae of mesonotum present, weakly marked (Fig. 16D).

Forewing: RA and RP veins with the apex gently curved anteriorly; r-m cross-vein present; ir cross-vein distant from r-m2 cross-vein, not aligned; MP vein with four branches with uncurved apex; first bifurcation of MP vein arising before r-m cross-vein; m-cu cross-vein absent; CuP vein approximately 3 times longer than Pcu + A 1 vein; apex of clavus with straight angle (Fig. 40C).

Hind wing: first bifurcation of MP vein arising before m-cu cross-vein (Fig. 40D).

Legs: metatibia with 8 apical spines; metatarsus with 6+6 apical spines.

Abdomen: posterior half of sternites IV + V and VI with four long, thin, whitish setae; posterior margin of sternites VII semi-rounded in posterior view. Female (Fig. 16B). Similar to male, except for the coloration of some body parts (ranging from light brown to dark brown) and forewing (ranging from light brown to dark brown) and upper half of sternite III pale yellow (Fig. 16B).

Male terminalia (Figs 17A–G): Pygofer with posterior margin without projections, with sparse setae in posterior view (Fig. 17B). Gonostyli with rounded apex in lateral view, outer margin with short projection and with a rounded apex near apex and, inner margins with some micro setae (Fig. 17D). Phallic complex (Figs 17A, B): periandrium semi-oval with median prolongation basally in dorsal view, dorsal margin serrated and without indentation, and ventral margin with short indentation at the apex (Figs 17F, G). Inner sclerotised plates slender, with serrated margin and surface with small spiniform projections (Figs 17F, G). Anal tube (segment X), short, apex rounded in dorsal view, with few sparse setae dorsally (Fig. 17B).

Female terminalia (Figs 18A–G): pygofer with numerous setae in posterior view (Fig. 18B). Gonapophysis VIII (first valvula) robust, with a few setae on median region and covered with small spiniform projections in the basal half in lateral view; four lateroapical projection of unequal sizes with irregular teeth on dorsal margin in lateral view (Fig. 18E). Bursa copulatrix densely filamentous apically, acute apex, covered by many setae laterally near to apex in lateral view (Fig. 18E). Gonapophysis IX (second valvula) robust, forked on apical half, lobes with pointed apex, strongly curved latero-ventrally in dorsal view (Fig. 18D). Gonoplac (third valvula) subtrapezoidal, apex rounded with several setae apically and sparse setae laterally near apex and small spiniform projections in the basal region, in lateral view (Fig. 18C). Anal tube (segment X), short, apex smoothly reentrant, with sparse setae in dorsal view (Fig. 18A).

Variations. Variations have been observed in the coloration of the body in some specimens, from light brown to dark brown.

Distribution. Brazil (Amazonas) and Guiana (New River) (Fig. 43).

Comments. B. guianesus (Fennah, 1947) differs from B. banksi (Metcalf, 1938) as previously discussed in the description of the latter.