Oiovelia hamadae Rodrigues & Melo sp. nov. (Figs 50–51, 62–64, 75, 79) Type locality. Brazil, Amazonas, Manaus. Type material. All specimens macropterous. HOLOTYPE: ♂(INPA), BRAZIL: AMAZONAS: Manaus, Reserva Forestal Adolpho Ducke, Igarapé Acará, on foam masses, 22.vi.2011, H.D.D. Rodrigues coll. PARATYPES: 10 ♂♂18 ♀♀ (INPA), 3 ♂♂3 ♀♀ (DPIC), 3 ♂♂3 ♀♀ (MZSP), 2 ♂♂4 ♀♀ (NMPC), same data of holotype. Additional material examined. All specimens macropterous. BRAZIL: AMAZONAS: 1♂ (DPIC), Presidente Figueiredo, BR-174, Km 135, Igarapé Canoas, igarapé II do ramal Castanhal, 01º49 ' 51 ″ S / 60º04 ' 15 ″ W, 10.ix.2002, D.L.V. Pereira coll.; 1 ♀ (DPIC), same data, except igarapé I do ramal do Castanhal, 09.ix.2002, 03º01 ' 45 ″ S / 60º08 ' 33 ″ W; 2 ♀♀ (DPIC), Presidente Figueiredo, Vivenda Fênix, ramal do Urubuí, Km 9, 02º03 ' 00 ″ S / 60º06 ' 09 ″ W, 16.x.2002, D.L.V. Pereira coll. Dimensions. Macropterous male (n = 5; mm). BL 3.20–3.42; HL 0.45–0.52; HW 0.60–0.64; ANT I 0.55–0.60, ANT II 0.50–0.52, ANT III 0.37–0.39, ANT IV 0.41–0.45; EYE 0.18–0.20; PL 1.17–1.27; PW 1.07–1.20; FORE LEG: FEM 0.80–0.82, TIB 0.80–0.85, TAR I 0.06–0.07, TAR II 0.08–0.10, TAR III 0.31–0.32; MID LEG: FEM 1.03–1.05, TIB 1.10–1.20, TAR I 0.07, TAR II 0.17–0.23, TAR III 0.32–0.35; HIND LEG: FEM 1.12–1.25, TIB 1.37–1.53, TAR I 0.07–0.08, TAR II 0.25–0.27, TAR III 0.35–0.37. Macropterous female (n = 5; mm). BL 3.50–3.75; HL 0.45–0.55; HW 0.62–0.66; ANT I 0.58–0.64, ANT II 0.52–0.55, ANT III 0.37–0.40, ANT IV 0.45–0.47; EYE 0.18–0.20; PL 1.27–1.35; PW 1.15–1.25; FORE LEG: FEM 0.89–0.92, TIB 0.87–0.92, TAR I 0.07, TAR II 0.10–0.11, TAR III 0.32–0.35; MID LEG: FEM 1.12–1.15, TIB 1.18–1.27, TAR I 0.07–0.09, TAR II 0.22–0.23, TAR III 0.33–0.39; HIND LEG: FEM 1.25–1.32, TIB 1.52–1.62, TAR I 0.08, TAR II 0.27–0.32, TAR III 0.38–0.40. Description. Macropterous male. Color. Head orange brown, with ventral region brownish. Antennae dark brown. Eyes dark red. Rostrum brown, with dorsal surface and lateral margins of segment III yellowish, segment IV black. Pronotum orange brown, with anterior lobe dark brown. Fore wings blackish, with well defined whitish pruinose areas between cells; veins lighter, and a pair of narrow whitish maculae starting from humeri and ending near apex of pronotum (Fig. 50). Pro- and mesopleura with superior half orange brown, inferior half brownish (Fig. 79). Coxae, trochanters and a narrow basal area of femora yellowish, rest of legs dark brown to black. Prosternum brown to orange brown; meso- and metasternum dark brown. Abdominal segments orange brown near connexiva and blackish in spiracle region; sternites brown to dark brown. Genital segments brownish. Structural characters. Head covered by fine golden pubescence and long dark setae. Antenniferous tubercles swollen, shiny. Antennae covered by golden pubescence, with long dark setae scattered on antennomeres III–IV; antennomere I robust, curved outward; II slightly more robust than III, longer; antennomere IV slightly longer than III, fusiform. Pronotum covered with golden pubescence, long dark setae laterally concentrated on anterior lobe, and posteriorly on apical margin; a pair of whitish pruinose areas between anterior and posterior lobes; another V-shaped pruinose area more evident on posterior lobe, not reaching its margins (Fig. 50); longitudinal midline weakly carinate, more evident between humeral angles. Pleurae with pruinose areas; pro- and mesopleura with small rounded punctations; metapleura with whitish setae posteriorly. Legs covered by golden pubescence, with scattered long dark setae. Protibia slightly flattened distally, with grasping comb approximately on posterior half. Pruinose areas laterally on abdominal segments IV–VII, and pruinosity of segment IV does not reach the region above spiracles. Connexiva not elevated, covered by golden pubescence and long dark setae. Body ventrally covered by whitish pubescence. Genital segment I with anterior margin excavated ventrally; posterior region with long dark setae dorsally; dorsal posterior margin slightly concave medially (Figs 62–63). Proctiger without expansions, projections or spines (Fig. 64). Paramere elongated, slightly tapering medially, wider and rounded at apex (Fig. 75). Macropterous female. Similar in color and morphology to macropterous male (Fig. 51), except for the more elevated connexiva and pruinose areas on lateral margins of abdominal segments IV–VII and a small area on segment III. Differential diagnosis. This species is known only in the macropterous form. The body color and pruinosity are very similar to O. chenae sp. nov., which may make the differentiation of the females of both species more difficult. Generally, in O. hamadae sp. nov. the dorsal half of the pro- and mesopleura is orange brown, whereas the ventral half is dark brown, and in O. chenae the pro- and mesopleura are entirely dark brown to blackish. However, they are easily distinguished by the paramere slightly narrowing towards the apex in O. chenae, which does not occur in O. hamadae. In the latter species, the paramere is slightly narrow in middle, widening posteriorly, with wider and rounded apex. Etymology. Named in honor of Dr. Neusa Hamada (Instituto Nacional de Pesquisas da Amazônia, Manaus), in recognition of her contributions to the knowledge of the aquatic insects of Brazil. Distribution and habitat. Brazil (Amazonas). The type series of the new species was collected on the foam masses formed on the banks of a black water stream, in a ‘terra firme’ forest of the Amazonas state, northern Brazil.

Published as part of Rodrigues, Higor D. D., Melo, Alan Lane De & Ferreira-Keppler, Ruth L., 2014, Taxonomic revision of the Neotropical genus Oiovelia (Hemiptera: Heteroptera: Veliidae), pp. 65-98 in Acta Entomologica Musei Nationalis Pragae (suppl.) (suppl.) 54 (1) on pages 87-89, DOI: 10.5281/zenodo.4468235