Cromata flavida, Campos, Luiz Alexandre & Roell, Talita, 2017

Campos, Luiz Alexandre & Roell, Talita, 2017, Description of four new species of Ochlerini from South America (Hemiptera: Pentatomidae: Discocephalinae), Zootaxa 4236 (3), pp. 507-520 : 508

Cromata flavida sp. nov.

( Fig. 1 )

Etymology. The epithet refers to the yellowish body; Latin: flavidus, yellowish.

Type locality. Brazil, Amazonas, Manaus (coordinates: -3.1019, -60.0250)

Male Holotype. Labels: Brasil, Amazonas, Manaus, D. Pedro, IMTM, 2/I/1990, Remold, H., col. ( DZUP).

Description. Body oval, yellowish brown, punctures brown. Head subquadrangular, little wider than long; punctures forming wrinkles on mandibular plates and clypeus; 1+1 yellow longitudinal stripes on vertex; lateral margin of mandibular plates sinuous, little longer than clypeus; clypeus wider than each mandibular plate at constriction before eyes. Interocular distance three times larger than width of eye. Ocelli placed close to the lateral margins of head and posterior to an imaginary line connecting the posterior limit of eyes. Antennae with five antennomeres. Proportion of antennomeres: I>II<III<IV, both V lost in holotype. Antennal tubercles almost completely covered by mandibular plates from above; lateral margins round. Bucculae triangular in lateral view, ventral margin convex. Labium long, arising anterior to an imaginary line connecting the anterior margins of eyes, and posterior to anterior limit of bucculae (anterior? of bucculae not enclosing the labium), reaching the sixth abdominal segment. Proportion of labium segments: I<II>III<IV, second the longest. Labrum sinuous, bent forward.

Pronotum trapezoidal, wider than long at midline; punctures forming wrinkles on posterior half; cicatrices flat, almost indistinguishable. Anterior margin concave, anterolateral margins subrectilinear, reflexed. Anterolateral angles rounded, surpassing the eyes laterally by half the width of one eye. Humeral angles not produced. Scutellum longer than wide, surpassing an imaginary line connecting middle of each connexival segment V; punctures denser on disc, forming wrinkles. Frenal margins longer than postfrenal margins. Corium longer than scutellum, reaching connexival segment VI; punctures smaller than on scutellum, not forming wrinkles; spot at apex of radial vein inconspicuous; membrane not surpassing the apex of abdomen, bearing five longitudinal veins. Prosternum flat, meso- and metasternum with a low, almost inconspicuous carina. Pro-, meso-, and metapleura sparsely punctured, metapleural evaporatorium extending less than half of metapleura. Peritrema spout. Legs yellowish with three alternate brown bands both on femora and tibiae ( Fig. 1 A–D). Tibiae sulcated dorsally and laterally, bearing lateral and ventral setae, denser at apex. Third metatarsomere dorsally concave in male.

Abdomen with connexival segments brown on anterior half and posterior quarter, yellowish between these brown areas; abdominal venter convex at midline, bearing dark vitae on middle of sternite VII, thinly punctured lateral to vitae; tricobothria lateral to imaginary line connecting spiracles.

Male. Third metatarsomere dorsally concave. Intersegmental membrane posterior to urosternite VII posteriorly projected at midline in semilunar shape over segment X. Pygophore with trapezoidal posterolateral angles ( Fig. 1 E, G, pa) dorsally excavated housing apex of large, curved blade-like parameres ( Fig. 1 G, par); posterolateral angles bearing subapical dense tuft of setae ( Fig. 1 E–H); ventral rim deeply U-shaped in posterior view ( Fig. 1 E), leaving the segment X visible in ventral view ( Fig. 1 H). Pygophore tumescent ventrad to ventral rim ( Fig. 1 E, G, H). Segment X ogival posterior to anal opening, bearing dense lateral fringe of long setae ( Fig. 1 E, G, H).

Measurements. (n=1) head length 1.60; width 1.72; interocular distance 1.02; pronotum length 1.84; width 4.00; scutellum length 3.00; width 2.60; length of antennomeres: I 0.64, II 0.56, III 1.00, IV 1.10, V –; length of labium segments: I 1.00, II 1.60; III 1.20, IV 1.24; length of abdomen 3.65; width 4.60; total length 7.00.

Female unknown.

Comments. Cromata flavida is described in Cromata Rolston for sharing the following characteristics with the other two species in the genus, Cromata ornata Rolston and Cromata graziae Campos : proportions of the antennal segments, a somewhat light color pattern, the shape and proportions of the head, long rostrum, structure of thoracic sterna, and shape and extension of both evaporatorium and peritreme. The new species can be distinguished from both C. ornata and C. graziae by the much smaller size, the reduced number of hemelytral veins, and by the lighter color of legs; males of C. flavida can be distinguished from C. graziae by the shape of the posterior projection of the articular membrane posterior to urosternite VII, the shape of the ventral rim of pygophore, the swollen area ventrad to the ventral rim, the shape of the posterolateral angles and parameres, and the shape of segment X posterior to the anal opening. The overall structure of both the pygophore and the segment X in the two species can be considered diagnostic for Cromata , as proposed by Campos (2005).

Figures

FIGURE 1. Cromata flavida sp. nov., male holotype. A, B, D, dorsal, ventral and lateral view respectively. C, head and pronotum, dorsal. E – H, pygophore, E, G posterior view, F, H, lateral and ventral view rescpectively. Abbreviations: pa, posterolateral angle; par, paramere; vr, ventral rim; X, segment X. Scale bars = 1 mm.