Horistonotus nordestinus sp. nov.

(Figs. 47–69, 133–146, 160)

Holotype (male): [Brazil]. Canindé do S[ão] F[rancis]co (SE) (Faz[enda] Poço Verde), 15.IV.2000, am.1, Iannuzzi, L. col. (Malaise); Proj. Xingó Biodiversidade Área 1 (MZSP).

Paratypes. Canindé do S. Fco. (SE), (Faz. Brejo), 4.III.2000, am.1, Iannuzzi, L. col. (Malaise); Proj. Xingó Biodiversidade Área 5 (3 exs) (MZSP); idem, 11.III.2000, idem Área 5 (3 exs) (UFPE); idem, 18.III.2000, idem (3 exs) (DZUP); idem, 25.III.2000, idem (3 exs) (AMNH); idem, 1.IV.2000, idem (3exs) (FSCA); idem, 1.IV.2000, idem Área 6 (1 ex.) (MNHN); idem, 08.IV.2000, idem Área 5 (3 exs) (MNHN); idem, 15.IV.2000, idem (3 exs) (BMNH); idem, 15.IV.2000, idem Área 6 (1 ex.) (MZSP); idem, 22.IV.2000, idem Área 5 (3 exs) (DZUP); idem, 08.II.2001, arm.5 (solo), idem Área 1 (1 ex.) (MZSP); idem, 08.II.2001, idem (Malaise); idem (3 exs) (MNRJ); idem, 15.II.2001, idem (3 exs) (AMNH); idem, 15.II.2001, idem, (solo); idem (1 ex.) (FSCA); idem, 22.II.2001 idem (Malaise); idem Área 2 (2 exs) (FSCA); idem, 01.III.2001, idem Área 1 (3 exs) (MNHN); idem, 22.III.2001, idem Área 2 (1 ex.) (DZUP); idem, 29.III.2001, idem Área 1 (3 exs) (BMNH); idem, (Faz.Esplanada), 28.IX.2000, am.3, idem Área 5 (1 ex.) (MZSP); idem, (Faz. Jaburu), 17.VIII.2000, idem Área 3 (3 exs) (MZSP); idem, 24.VIII.2000, idem (3 exs) (UFPE); idem, 24.VIII.2000, idem Área 4 (1 ex.) (MNRJ); idem, 31.VIII.2000, idem Área 3 (3 exs) (FMNH); idem, 7.IX.2000, am.3, idem Área 3 (3 exs) (MZSP); idem, 14.IX.2000, idem (3 exs) (MZSP); idem, 14.IX.2000, idem Área 4 (1 ex.) (MZSP); idem, 21.IX.2000, idem Área 3 (3 exs) (MZSP); idem, (Faz.Miramar), 8.II.2001, am.5, idem Área 5 (3 exs) (MZSP); idem, 15.II.2001, idem (3 exs) (UFPE); idem, 01.III.2001, idem (3 exs) (MZSP); idem, 01.III.2001, idem (solo); idem Área 7 (3 exs) (MZSP); idem, 08.III.2001, idem (Malaise); idem Área 5 (3 exs) (MZSP); idem, 15.III.2001, idem (3 exs) (MZSP); idem, 15.III.2001, idem (solo); idem Área 6 (1 ex.) (MZSP); idem, 22.III.2001, idem (Malaise); idem Área 5 (3 exs) (MZSP); idem, 22.II.2001, idem (solo); idem Área 7 (1 ex.) (UFPE); idem, 22.II.2001, idem Área 5 (1 ex.) (MZSP); idem, (Faz.Poço Verde), 4.III.2000, am.1, idem (Malaise); idem Área 3 (3 exs) (MZSP); idem, 4.III.2000, idem Área 1 (2 exs) (UFPE); idem, 4.III.2000, idem Área 4 (1 ex.) (MZSP); idem, 11.III.2000, idem (2 exs) (MZSP); idem, 11.III.2000, idem Área 1 (2 exs) (MZSP); idem, 11.III.2000, idem Área 3 (3 exs) (MZSP); idem, 18.III.2000, idem (3 exs) (MZSP); idem, 18.III.2000, idem Área 1 (3 exs) (MZSP); idem, 25.III.2000, idem (3 exs) (UFPE); idem, 25.III.2000, idem Área 3 (3 exs) (MZSP); idem, 1.IV.2000, idem Área 1 (1 ex.) (MZSP); idem, 1.IV.2000, idem Área 3 (3 exs) (MZSP); idem, 8.IV.2000, idem (3 exs) (MZSP); idem, 8.IV.2000, idem Área 2 (3 exs) (MZSP); idem, 15.IV.2000, idem (3 exs) (MZSP); idem, 15.IV.2000, idem Área 1 (3 exs) (MZSP); idem, 22.IV.2000, idem (3 exs) (MZSP); idem, 22.IV.2000, idem Área 3 (3 exs) (MZSP); idem, (Faz. Porto Belo), 13.VIII.2000 am.3, idem Área 1 (1 ex.) (MZSP); idem, (Reserva Chesf), 25.V.2000, am.2, idem Área 8 (1 ex.) (UFPE); idem, 1.VI.2000, idem (2 exs) (MZSP); idem, 17.VIII.2000, am.3, idem Área 1 (4 exs) (MZSP); idem, 17.VIII.2000, idem Área 8 (1 ex.) (MZSP); idem, 14.IX.2000, idem (3 exs) (MZSP); idem, 21.IX.2000, idem Área 9 (2 exs) (MZSP); idem, 28.IX.2000, idem Área 1 (1 ex.) (MZSP); idem, 28.IX.2000, idem (solo); idem (1 ex.) (MZSP); idem, 28.IX.2000, idem (Malaise); idem Área 8 (1 ex.) (MZSP); idem, 01.III.2001, idem, am.5, idem (1 ex.) (MZSP); idem, 22.III.2001, idem (1 ex.). Olho d´água do Casado (AL) (Faz. Capelinha), 11.V.2000, am.2, idem Área 1 (3 exs) (MZSP); idem, 18.V.2000, idem (3 exs) (UFPE); idem, 25.V.2000, idem (2 exs) (UFPE); idem, 1.VI.2000, idem (2 exs) (MZSP); idem, (Faz.Curralinho), 15.III.2001, am. 5, idem Área 3 (1 ex.) (MZSP); idem, (Faz.São José), 31.X.2000, am.4, idem (solo); idem área 4 (1 ex.) (MZSP); idem, 16.XI.2000, idem (Malaise); idem (3 exs) (UFPE); idem, 16.XI.2000, idem área 1 (1 ex.) (MZSP); idem, 23.XI.2000, idem área 4 (3 exs) (MZSP); idem, 30.XI.2000, idem área 2 (1 ex.) (MZSP); idem, (Faz. Talhado), 30.IX.2000, idem, área 6 (3 exs) (MZSP); idem, 11.X.2000, idem (3 exs) (UFPE); idem, 19.X.2000, idem, área 5 (3 exs) (MZSP); idem, 26.X.2000, idem (3 exs) (MZSP); idem, 7.XII.2000, idem, Área 6 (3 exs) (MZSP); idem, 14.XII.2000, idem (3 exs) (MZSP); idem, (Faz. Vera Cruz), 29.VI.2000, am.2, idem Área 5 (1 ex.) (MZSP). Piranhas (AL) (Faz. Mecejana), 04.III.2000, am.1 (Malaise); idem, Área 7 (2 exs) (UFPE); idem, 18.III.2000, idem (3 exs) (MZSP); idem, 25.III.2000, idem (1 ex.) (MZSP); idem, 1.IV.2000, idem Área 3 (1 ex.) (MZSP); idem, 1.IV.2000, idem Área 8 (1 ex.) (UFPE); idem, 8.IV.2000, idem Área 7 (2 exs) (MZSP); idem, 15.IV.2000, idem (4 exs) (MZSP); idem, 22.IV.2000, idem (3 exs) (MZSP).

Holotype (male). Body length: 4.5 mm.

Integument brown; elytra slightly lighter; median region of frons, fore angles of pronotum and median region of scutellum, yellowish-brown; antennae, palpi and legs yellowish; antennomeres IV–XI with lateral rounded prominence clearer. Pronotum, brighter than elytra. General pubescence fine, long, very dense, yellowish-white and decumbent, covering partially integument, giving a silky appearance; pubescence of frons and pronotum: thicker, longer and bristle setae, inserted into sparse umbilicate punctation and finer and decumbent setae inserted in dense and fine punctation.

Frons (Figs. 137, 143) convex, wide, roundly emarginate laterally; anterior margin raised, forming narrow ridge, prominent and rounded at middle; punctation fine and dense intermingled with umbilicate, coarse and moderately dense, more concentrated near base; secondary carina short. Antennae (Fig. 47) reaching hind angles of pronotum; antennomeres II and III elongate, almost same size; slightly serrate from antennomeres IV–X, with lateral prominence rounded.

Pronotum (Figs. 48, 134) slightly wider than long (length including hind angles), slightly narrowed and parallel at basal third; strongly and roundly convex from lateral margins, on anterior 2/3, declivous backwards between hind angles; punctation (Fig. 139) umbilicate coarse, very dense, coarser near lateral margins, with fine punctation among coarse punctures; lateral margins slightly rounded; lateral carina short, present on basal third; hind angles moderately wide, backwardly directed with lateral carina fused with lateral carina of pronotum making carina wider in this area; each side of posterior margin with angular excavation. Hypomeron (Figs. 49, 50) with hind angles wide and rounded and punctation very coarse (coarser than pronotum) and dense. Pronotosternal sutures almost straight, fine and opened anteriad forming a channel. Prosternum (Fig. 141) with punctation moderately coarse and moderately dense, intercalated by fine punctation. Prosternal spine (Fig. 141) short, compressed laterally, cuneiform, carinate laterally at procoxal cavity. Borders of mesosternal cavity (Fig. 146) short, horizontal at base and vertical at mesosternal cavity level. Metasternum with inclined line, parallel internal margin of each mesocoxal cavity. Metacoxal plate (Fig. 56) very wide, strongly narrowed at lateral half. Leg (Figs. 142, 144): tibia with two microspined tibial spurs; tarsomeres (Fig. 58) simple; tarsomere I almost as long as II; tarsomere IV shorter than V; tarsal claws (Figs. 142, 145) with a sharpened tooth at midlength. Last ventrite of male (Fig. 63) transverse, triangular with rounded apex. Scutellum (Fig. 136) pentagonal, narrowed anteriorly. Elytral base as wide as pronotal base; humerus (stria 7) shortly carinate laterally at base making elytra parallel in this region; elytra slightly widened from apex of lateral carina and gradually narrowed from apical 3/5 to apex; apices narrowed and conjointly rounded; striae grooved and coarsely punctated; interstices flat.

Paratypes. Body length: 3.2–4.6 mm.

Integument brown of several tonalities; several specimens with fore angles of pronotum and/or median region of scutellum and/or humeral region of elytra yellowish-brown; sometimes whole elytra yellowish-brown. Antennae usually clearer than body; several specimens with antennae brownish or first antennomeres and/or basal region especially of basal antennomeres brownish.

Antennae (Figs. 133, 138) reaching hind angles of pronotum in male, slightly shorter in female. Labrum (Fig. 52) transverse, semi-elliptical; coarsely and heterogeneously punctated, densely setose; setae of varied sizes, majority very long. Mandibles (Figs.54–55) narrow, elongate; apex widened with three weak, rounded teeth; dorsal region raised at middle, with a rounded carina near mesal margin and setae of varied sizes near lateral margin; penicillum formed by fringe of long setae. Maxilla (Fig. 51): galea and lacinia brush-like; mediostipes almost rectangular with tiny setae near middle (represented by punctures); basistipes triangular with setae moderately long; cardo triangular with moderately long setae inserted at lateroexternal half; palpus setose; distal palpomere securiform. Labium (Fig. 53): pre-mentum membranous with three moderately long setae inserted in front of each basal palpomere; posmentum wider than long, glabrous, with anterior margin rounded; palpiger membranous, each with four setae; palpi with three palpomeres; distal palpomere securiform.

Male. Tergite VIII (Fig. 65) slightly longer than, narrowed to apex; apex prominent and rounded; short setae near margins at distal half. Sternite VIII (Fig. 64) membranous, transverse, strongly notched at middle forming a well developed lobe each side; setae moderately long near apex of each lobe. Sternite IX (Fig. 66) elongate, rounded and widened near middle, constricted at distal third; apex triangular; short setae at apex. Tergite IX (Fig. 67) transverse, narrowed apicad; strongly notched at middle; lateral margins rounded; glabrous; tergite X elongate, narrower than tergite IX, with rounded apex; inserted at tergite IX apex. Aedeagus (Figs. 68, 69): basal piece wider than long. Parameres separated, almost twice median lobe length (excluding basal struts); narrowed laterally at extremities, wider at median 2/4; lateral margins rounded; apex spatuliform, wider ventrally with subapical dorsal and ventral setae of varied sizes. Median lobe very widened at base; apex narrowed and rounded.

Female. Tergite VIII (Fig. 58) slightly wider than long, slightly narrowed apicad; apex rounded; setae of varied sizes at margins of distal third. Sternite VIII (Fig. 59) triangular with setae of varied sizes near margins and short setae disposed in two longitudinal narrow bands near middle; spiculum gastrale about six times sternite length. Each coxite (Fig. 60) with one short one-segmented stylus with two distal setae. Anterior most section of bursa copulatrix (Fig. 62) sac-like with two sclerotized toothed plates (Fig. 61); extension of anterior most section elongate, coiled on distal half; glandular reservoir entering bursa copulatrix on ventral surface, near apex.

Etymology. The specific epithet is a derivative of Portuguese word “Nordeste” (= Northeast), referring to Brazilian region where the material was collected.

Remarks. H. nordestinus is easily recognized especially by pronotum very shiny, with silky appearance. The pronotum presents two kinds of setae and punctures intermingled: punctation umbilicate and coarse with thicker setae and punctation fine with fine setae. It is similar to H. acutipennis Candéze, 1860 (from Venezuela), but H. nordestinus is smaller and lighter brown and the elytral interstices are not carinate at apex. Distribution. Brazil: Alagoas and Sergipe.