Dinelytron trimaculatus Heleodoro & Rafael 2020, sp. nov.

Dinelytron trimaculatus sp. nov.

Fig. 23A.

Examined material. Holotype _ (Fig. 15A): “ Floresta da Tijuca, Guanabara [Rio de Janeiro], BRASIL, 5.ii.1951, C. A. Campos Seabra coletor, Coleç~ao Campos Seabra ”. (MNRJ lost in the burning).

Paratype _: “ Fazenda Peneco, Itatiaia [state of Rio de Janeiro, Brazil], 21.ii.1942, Vygod. [Wygodzinski] leg.” (MNRJ lost in the burning).

Etymology. The species name is derived from the Latin tri (three) and macula (spot), referring to the three spots present dorsally on the mid femur.

Diagnosis. Area between clypeus and labrum elongated, thin, conspicuous (Fig. 23B, C). Mid femur posteriorly with three light brown spots (Fig. 23D, E). Subgenital plate short, arched, with basal margin almost straight, laterally curving abruptly, becoming slightly curve at apical margin (Fig. 24A). Genitalia in dorsal view: basal pouch shield-shaped, semi-ellipsoid; dorsal left sclerite slender, sinuous in all margins; internal sclerite trapezoidal, with apical margin concave (Fig. 25).

Description (Holotype _). General coloration light brown (Fig. 23A). Head. Dorsally rugose, with frontal suture conspicuous, forming a conspicuous triangular light-yellow sulcus (Fig. 23B); vertex with inconspicuous longitudinal medial sulcus. Clypeus five times wider than high, light yellow medially with black spot; basal margin concave, lateral margin convex, apical margin slightly sinuous (Fig. 23B, C). Area between clypeus and labrum elongated, thin, conspicuous (Fig. 23B, C). Labrum symmetrical, black (Fig. 23B, C). Antenna with flagellum dark brown (Fig. 15A); flagellomere 1 rectangular, longer than wide, 2.2 times longer than flagellomere 2; flagellomere 2 subtriangular; flagellomere 3 rectangular, longer than wide, 1.2 times longer than flagellomere 2. Compound eye globose, light brown with dark brown spots (Fig. 23A, B).

Thorax. Pronotum with inconspicuous longitudinal medial sulcus. Mesonotum 1.6 times longer than pronotum, with conspicuous longitudinal medial carina (Fig. 23A). Metanotum dark brown. Coxopleurite smooth, dark brown. Mesothoracic epimeron and episternum subtriangular, with longitudinal sinuous carina. Metapleural region light brown, smooth, shiny. Thoracic sterna light brown. Mesobasisternum with medial circular sclerite dark brown, conspicuous.

Legs. Anterior leg dorsally and ventrally light brown; mid leg anteriorly and posteriorly the same. Anterior femur dorsally with black spots, three longitudinal parallel carinae; ventrally smooth; anteriorly and posteriorly with setae. Anterior tibia dorsally with two longitudinal parallel carinae; ventrally smooth. Mid femur with three light brown spots posteriorly; dorsoposteriorly with three small spines apically (Fig. 23D, E). Mid femur and tibia with setae dorsally and ventrally. Posterior leg anteriorly and posteriorly dark brown. Posterior femur anteriorly rugose; posteriorly with several light brown spots; ventro-posteriorly with three spines in basal third and one spine in apical third.

Wings (23A). Tegmina light brown, with translucid veins and several transversal bifurcated veins. Anal area of posterior wing translucid.

Abdomen. Abdominal terga shiny, covered laterally by setae. Terga 1-7 rectangular, longer than wide. Tergum 8 dorsally trapezoidal, with apical margin 1.5 times wider than basal margin. Tergum 9 dorsally rectangular, 1.3 times longer than wide. Tergum 10 with basal margin straight, lateral margin curved, apical margin sinuous, medially with emargination. Cercus cylindrical, with small setae, approximately same length as tergum 10. Sterna 1-5 light brown medially with dark brown stripe. Sternum 6 trapezoidal, 1.4 times wider than long (Fig. 24A). Sternum 7 rectangular, 2.6 times wider than long (Fig. 24A). Sternum 8 rectangular, 3.5 times wider than long (Fig. 24A). Subgenital plate short, arched, with basal margin almost straight, laterally curving abruptly, becoming slightly curved at apical margin (Fig. 24A). Vomer with widened base, gradually narrowing from base towards apex, with lateral margin slightly curved, apex strongly pigmented (Fig. 24B).

Genitalia (Fig. 25). Basal pouch shield-shaped, semi-ellipsoid; dorsal left sclerite sinuous in all margins, slender, not attached to dorsal wall of geniitalia; internal sclerite trapezoidal, with apical margin concave, attached to dorsal wall of genitalia. Left posterior process conspicuous. Ventral lobe wide, subdivided in lower and upper lobule; with one bifid finger-like projection at anterior margin of lower lobule.

Measurements. Body length 37.7-37.9; dorsal head length 1.8; pronotum; 2.2-2,4; mesonotum 3.0; anterior femur 7.4; anterior tibia 5.4-5.5; mid femur 5.2-5.4; mid tibia 4.7-4.8; posterior femur 8.8-9; posterior tibia 7.0.

Type condition. All lost in September 2018 burning of the MNRJ.

Geographical records. Brazil, Rio de Janeiro: Itatiaia.

Remarks. Di. trimaculatus sp. nov. can be differentiated from all other Dinelytron species by the three spots dorsally present on the mid femur, which are better observed at distance.