Amblycerus falcorostrus Ribeiro-Costa & Morse 2025, sp. nov.

Amblycerus falcorostrus Ribeiro-Costa & Morse sp. nov. Fig. 3 A – G, Table 1 Type material. Holotype • Deposited in INPA, male, with labels: Brasil: Amazonas \ AM 010, Km 26 \ Reserva Ducke \ 29 - VIII- 1978 [white label, printed in black except date handwritten]; armadilha \ de Malaise [white label, printed in black]; INPA [white label with black margin, printed in black]; Amblycerus \ sp. 2 \ Ribeiro-Costa, C. S. det. 2009 [white label with black margin, handwritten except name of identifier and date printed in black]; HOLOTYPE \ Amblycerus falcorostrus \ Ribeiro-Costa & Morse [white label with red margin, printed in black]. Diagnosis. The main character to distinguish A. falcorostrus Ribeiro-Costa & Morse, sp. nov. from others in the group is the presence in the internal sac of male genitalia of a single, strongly curved tooth-shaped sclerite on both sides at AR (Fig. 3 F). Description. The description of A. falcorostrus Ribeiro-Costa & Morse, sp. nov. is similar to A. truncatus Ribeiro-Costa, sp. nov. except by the following characters. Dimensions: BL: 6.60 mm, BW: 3.80 mm (n = 1). Integument color: Dark brown in following areas: vertex, apex of clypeus, labrum, pronotum, elytra, pygidium, abdominal ventrites, first femur and middle leg. Black on part of head, antennomeres, metanepisternum, metasternum, and hind leg. Vestiture: Ventral region with whitish pubescence except abdominal ventrites with yellowish pubescence. Head: Frontal carina absent, finely punctate or smooth on midline. Ocular index: 5.3; ocular sinus 0.05 of the eye length in lateral view. Prothorax: Pronotum with carinae bordering the basal lobe and laterally. Mesothorax and metathorax: Scutellum about as long as wide with tridentate apex, all teeth the same size. Elytron 1.4 × longer than wide. Metanepisteral sulcus with the vertical axis reaching the margin of metepisternum. Metaventrite with median sulcus extending laterally more than a half of its length. Hind femur ~ 2.72 × longer than wide. Hind tibia lateral spur ~ 2 × the length of median spur. First tarsomere ~ 1.38 × the length of lateral spur and 2.61 × the length of median spur. Abdomen: Pygidium rounded at apex in male, female unknown. Last ventrite almost the same length as ventrite IV, male apex not visible. Male terminalia: Tergite 8 gently emarginate at apex. Median lobe ~ 5.34 × its widest at apical region; dorsal valve 0.88 × wider than long; ventral valve 1.28 × wider than long. Armature of internal sac, AR with one strongly curved tooth-shaped sclerite in both sides. MR with a pair of winding, laminar sclerites, outer margin serrate along its middle apical 0.7 length; wishbone-shaped sclerite 0.63 as long as the laminar sclerites length, straight, apex enlarged, subtruncate and serrate in lateral view. Tegmen with lateral lobes cleft 1 / 16 of their length. Etymology. The specific name is a new Latin adjective in the nominative case meaning “ with a falcon-like beak ”. It refers to the form of the AR sclerite in the internal sac of the male genitalia. Distribution. Brazil (Amazonas-Manaus). Host plants. Not known.