Campsurus lacia sp. nov. De Lima, Cruz & Hamada

(Figures 5A–I; 6A–C; 7A–E)

Type Material. Holotype: male imago (INPA) from Brazil; Rondônia; Machadinho D’oeste, Machado River, 2 November waterfall, S08°54’27.77”, W062°10’36.53”, 08.vii.2018, P. V. Cruz, G. Desidério, N. Hamada, J. O. da Silva, Andrew Short, cols . Paratypes: 20 male imagos, one female imago, (10 at INPA, 10 at ENT-UNIR), same data as holotype . Additional material. One male imago from Brazil, Maranhão, Caxias, fazenda Pé de Serra, Rio Itapecuru, S05°07’28.5”, W043°33’02.3”, 06.iv.14, S. Nascimento col.; 03 male imagoes (ENT-UNIR), from Brazil, Piauí, Campo Maior, São Gonçalo do Gurgueia, Comunidade do Arara, rio Gurgueia, S10°2’41.94”, W45°19’33.12”, 24.vi.2024, L. R. C. Lima, S. Nascimento, S. E. C. Vitor, cols.; 03 male imagoes (ENT-UNIR), same data except date 08–09.viii.24 and cols. L. R. C. Lima, I. Gonçalves, C. R. T. de Lima .

Diagnosis. Male imago: 1) sternum IX with posterior margin straight (Figs. 5C and G); 2) pedestal touching basally; inner projection subtriangular, short and robust, wider than long; outer projection reduced, tapering towards the apex (Figs. 5C and D, 6A); 3) base of each penis subtrapezoid (Figs. 5C, D and F, 6A and B); 4) main lobe of penis sclerotized, tapering towards the apex, longer than secondary lobe, slightly curved ventrally (Figs. 5C, E and G, 6B); 5) secondary lobe membranous, positioned in front of the main lobe, straight, rounded apex with sparse setae (Figs. 5C–E and G, 6A and B). Female imago: 6) sternum VIII with a pair of elongate, fused, apically rounded socket (Figs. 7A–E).

Description. Male imago. Length (n=10, mm): body, 9.8–10.1; fore wing, 9.6–9.8; hind wing, 4.9–5.5; cerci, 22.1–23.1 (the additional material of Piauí were used for measurements and description for wings. All wings of the type material are broken). General coloration yellowish brown (Fig. 5A). Head yellowish, completely shaded with black dorsally, shaded with gray ventrally; antennae shaded with gray (Fig. 5A). Thorax. Pronotum whitish translucent, slightly shaded with gray; meso and metanotum yellowish, sutures blackish, parapsidal suture and area between posteroscutal protuberances slightly shaded with black; prosternum whitish, slightly shaded with gray; meso and metastenum yellowish; mesofurcastenum slightly shaded with gray, mesofurcasternum plate yellowish, with inner margin parallel (Figs. 5A and B). Legs. Foreleg, middle and hind legs shaded with gray. Wings. Fore wing with membrane hyaline; veins C, Sc and R light brown in the basal 1/3; other veins whitish; cross veins whitish; R whitish distally; IMP1 connected directly to MP; ICuA1 connected directly to ICuA2. Hind wing with whitish veins. Abdomen. Whitish translucent, slightly shaded with gray on terga III–VII; VIII–X darker (Fig. 5A). Abdominal sterna translucent, with yellowish sternum IX–X, slightly shaded with black (Fig. 5B). Genitalia. Sternum IX with posterior margin almost straight (Fig. 5C, 6A and B); pedestal touching basally; inner projection subtriangular, short and robust, wider than long, with rounded apex; outer projection reduced, tapering towards the apex (Fig. 5D, 6A); forceps whitish; base of each penis subtrapezoid; main lobe of penis sclerotized, slightly curved ventrally, tapering towards the apex; secondary lobe membranous, positioned in front of the main lobe, straight, shorter than main lobe, rounded apex with setae sparse (Figs. 5C–F, 6A and B). Subcircular paraproct, shortened and not protruding (Figs. 5H–I). Caudal filaments translucent whitish.

Female imago (Figs. 7A–E). Length (n=1, mm): body, 10.1; fore wing, 11.2; hind wing, 5.6; cerci, 3.8. Wings membranes hyaline, with whitish veins. Color pattern similar to male, except for fore wing with C, Sc and R veins and cross veins light brown in the basal 2/3; terga I to II slightly shaded gray, III–VII with well-defined dark posterior margin, VIII–IX shaded with gray (Fig. 7A). Sternum VIII with a pair of elongate, fused, apically rounded socket (Figs. 7C and D). Caudal filaments translucent whitish.

Etymology. Tribute to Laboratório de Citotaxonomia e Insetos Aquáticos—LACIA (INPA), coordinated by Dr. Neusa Hamada, for promoting and fostering aquatic science expeditions throughout the Amazon and Brazil. Name in apposition.

Distribution. Rondônia, Piauí, Maranhão — Brazil.