Horistonotus tricarinatipennis sp. nov.

(Figs. 81–103, 147–156, 161)

Holotype (male). [Brazil]. Canindé do S[ão] F[rancis]co (SE), (Faz[enda] Poço Verde), 4.III.2000, am.1, Iannuzzi, I. col. (Malaise); Projeto Xingó Biodiversidade Área 1 (MZSP).

Paratypes. [Brazil]. Canindé do S.Fco. (SE), (Faz. Poço Verde), 4.III.2000, am.1, Iannuzzi, I. col. (Malaise); Projeto Xingó Biodiversidade Área 1 (6 exs) (MZSP); idem Área 4 (2 exs) (UFPE); idem, 11.III.2000, idem Área 1 (2 exs) (MZSP); idem Área 4 (1 ex.) (DZUP); idem, 18.III.2000, idem Área 1 (5 exs) (MZSP); idem Área 3 (1 ex.) (MZSP); idem, 25.III.2000, idem (2 exs) (UFPE); idem Área 1 (4 exs) (MZSP); idem, 1.IV.2000, idem (1 ex.) (MZSP); idem, 8.IV.2000, idem Área 2 (1 ex.) (UFPE); idem, 15.IV.2000, idem Área 1 (3 exs) (UFPE); idem, 22.IV.2000, idem (3 exs) (MZSP); idem Área 3 (1 ex.) (DZUP). Olho D´água do Casado (AL) (Faz. São José), 11.X.2000, am. 4, idem Área 3 (1 ex.) (UFPE); idem, 16.XI.2000, idem (solo); idem Área 3 (1 ex.) (MZSP); idem, 16.XI.2000, idem (Malaise); idem Área 4 (1 ex.) (UFPE); idem (Faz. Talhado), 7.XII.2000, idem Área 6 (1 ex.) (MZSP); idem, 21.XII.2000, idem (solo); idem Área 6 (1 ex.) (MZSP).

Holotype (male). Body length: 7.8 mm.

General integument light reddish-brown with elytra yellowish-brown and legs yellowish; antennomeres III–X lighter laterally at apex; antennomere XI with lighter apex. General pubescence yellowish, fine, long, dense and decumbent, mixed with thick, bristle and sparse, shorter on metasternum; pubescence of elytra thicker and bristle near margins.

Frons (Figs. 147, 148) elongate, convex, widened behind eyes, emarginate laterally; anterior margin slightly rounded, carinate and upwards; punctation very dense, fine and weak, intermingled with moderately coarse and dense; secondary carina present. Antenna (Fig. 81) subserrate, reaching hind angles of pronotum; antennomeres III–IX elongate, slightly widened apicad.

Pronotum (Figs. 82, 147) slightly longer than wide (length including hind angles), narrowed anteriad, moderately convex, declivous near posterior margin; densely micropunctate intermingled with sparser and moderately coarse punctation (Fig. 149); lateral carina absent on distal third; hind angles moderately wide, backwardly directed; carinate laterally; carina fused with lateral carina of pronotum becoming carina wider in this area. Hypomeron (Fig. 83) densely micropunctate intermingled with sparse coarse punctation, coarser near middle. Pronotosternal suture slightly curved, not forming anterior channel. Prosternum densely micropunctate intermingled with sparser and fine punctation; prosternal spine flattened laterally with truncate apex. Metacoxal plate (Fig. 91) wide at internal half, strongly narrowed on lateral half. Leg (Fig. 88): two well developed tibial spurs; tarsus (Fig. 155); tarsal claws (Figs. 89, 150, 153) with median well developed triangular tooth near middle. Last ventrite transverse, triangular, strongly punctate and rugose. Scutellum (Fig. 152) pentagonal, wider than long, narrowed anteriorly. Elytra (Figs. 151, 154, 156) wider than prothorax base, with apex narrowed and conjointly rounded; striae grooved with row of coarse punctures; interstices convex; three interstices weakly carinate at apex.

Paratypes. Body length: 7.5–9.6 mm.

General integument (Fig. 161) brown or reddish-brown sometimes yellowish-brown; antennae sometimes yellowish. Some specimens with pubescence yellowish-white.

Antennae of female not reaching hind angles of pronotum (Fig. 147). Labrum (Fig. 84) transverse, band-like, semi-elliptical; anterior margin widely rounded; covered with long setae of varied sizes, more concentrate near margin. Mandibles (Figs. 86, 87) symmetrical, narrow with two apical wide and rounded teeth; penicillus long, formed by fringe of yellowish moderately long setae; dorsal region with a longitudinal median carina and many setae of varied sizes lateroexternally to carina. Maxilla (Fig. 90 - cardo removed): galea and lacinia brush-like; mediostipes longer than wide, with short setae near middle; basistipes triangular with many moderately long setae, more concentrate near middle; cardo (removed from figure) triangular with short setae; palpus setose; last palpomere slightly securiform. Labium (Fig. 85): mentum transverse, trapezoidal, membranous on anterior half; several moderately long setae distributed on basal half, palpiger elongate and setose; palpi setose; last palpomere strongly securiform.

Male. Tergite VIII (Fig. 100) wider than long, parallel on basal third, gradually narrowed on distal 2/3; anterior margin rounded; setae moderately long of varied sizes near distal margin. Sternite VIII (Fig. 98) wider than long; distal half abruptly narrowed laterally and widely notched at middle forming two well developed lobes near middle; setae of varied sizes distributed on distal 2/3, longer near distal margin. Sternite IX (Fig. 101) elongate, elliptical; distal margin slightly rounded; short setae near apex. Tergite IX (Fig. 99) transverse, deeply notched at middle; microspined laterodistally; tergite X narrow, elongate with short setae at apex; inserted at tergite IX apex. Aedeagus (Figs. 102–103): basal piece narrow, longer than wide, slightly wider than parameres base. Parameres separated, slightly narrowed laterally at extremities; one seta dorsal and one ventral near apex; subapical region wide, cuneiform with rounded apex. Median lobe short (excluding basal struts), about 0.40 time parameres length; narrow, almost parallel and widened near base; apex rounded.

Female. Tergite VIII (Fig. 94) transverse, half-moon shaped; a narrow band of setae of varied sizes at distal margin; setae more concentrate near middle. Sternite VIII (Fig. 97) pentagonal; distal margin very prominent at middle; setae of varied sizes at middle and near anterior margin; spiculum gastrale about 6 times longer than sternite. Genitalia (Fig. 96): apex of ovipositor (Figs. 92, 93) with a short one-segmented stylus with one long seta at apex; bursa copulatrix membranous with one pair of sclerotized horn-like pieces (Fig. 95).

Etymology. The specific epithet is a derivative of “ tri ” (= three) + “ carinatus ” (=carinate) + “ pennis ” (=elytra), referring to the presence of three short carinae at apical region of elytra.

Remarks. H. tricarinatipennis is easily recognized by combination of elytra lighter than general coloration, antennae subserrate and three elytral interstices carinate at apex. It is similar to H. marcidipes (Erichson, 1840), described from Ceará (Brazil), including aedeagus and elytra carinate, but in H. marcidipes the interstices are more strongly carinate forming a ridge and the elytral striae more strongly punctate making the interstices very narrow. Additionally, H. tricarinatipennis is darker, with pubescence thinner and denser and legs pale yellow.

Distribution. Brazil: Sergipe.