Roscius diversus, Stehlík & Jindra, 2010

Stehlík, Jaroslav L. & Jindra, Zdeněk, 2010, Two new species of the genus Roscius (Hemiptera: Heteroptera: Pyrrhocoridae), Zootaxa 2651 (1), pp. 59-63 : 60-61

Roscius diversus sp. nov.

( Figs. 1 , 3–4 )

Type material. Holotype: ♂, CENTRAL AFRICAN REPUBLIC: Lobaye: ‘Centr. African Rep., 150 km NWW Mbaïki , 04°03ʹ N 17°02ʹ E, 620 m, 14.VI.2009, J. Halada leg.’ ( PPUA) . Paratype: ♀, the same data as holotype ( ZJPC) .

Description. Colouration ( Fig. 1 ). The following parts of body are black: a spot reaching from the base of head towards middle of jugum and than continuing medially on clypeus towards its very apex, antennae (except very narrow ring on base of antennomere 1), labium (except the very base), gula, pronotum (except all margins), scutellum, clavus, corium (except basal and apical spot), membrane, posterior part of prosternal collar, pleura I–III, basisterna I–III, posterior pleural flange I (except its posterior margin) and entire posterior pleural flange II. Rest of the head, narrow rings at base of antennomere 1 and first segment of labium red. All margins of pronotum (lateral margin posteriorly more widely), a spot on the base of costal margin of corium which deflects posteriad accross the corium towards the apex of clavus (vaguely delimited), apical spot reaching from costal margin inwards and curved along the posterior corial margin towards claval apex, anterior part of prosternal collar, and pronotal epipleura yellowish. Posterior margin of pleural flange I and entire pleural flange III whitish, epicoxal lobes I–III in both sexes bright white.

In male abdomen, the black colouration covers lateral parts of zygosternites III and IV (from which run out a narrow stripe along the anterior margin towards their middle), nearly entire zygosternite V (except a posterolateral spot), entire zygosternite VI, and two thirds of zygosternite VII. Zygosternites III and IV medially widely whitish, the zygosternite V with posterolateral whitish spot. Posterior third of zygosternite VII, all ventral and dorsal laterotergites, and pygophore red.

In female abdomen, the black colouration covers zygosternite III laterally and narrowly also anteromedially, zygosternites IV–VII in various extent, as well as all ventral and dorsal laterotergites. Zygosternites III widely medially, median spots on posterior margins of zygosternites IV–VII (of various size), and outer female genitalia red.

Structure. Body large, slender. Head nearly horizontally positioned, dorsally flat, narrower and longer. Bucculae short. Antennae long. Pronotum relatively narrow, callar lobe somewhat raised, with two impressions; pronotal lobe flat. Labium reaching half of ventrite V in male, being somewhat longer in female.

Pygophore ( Fig. 3 ). In lateral view, ventral part of ventral wall more strongly convex, detached from dorsal part by deep furrow, dorsal part posteriorly convex, lateral rim sharply pointed and than regularly decreasing towards dorsal rim. In dorsal view, ventral rim strongly rounded, ventral rim infolding sloping upright into genital chamber, lateral rim near the ventral rim with arrow-shaped ridge directed to the external margin (appearing as a sharp point in lateral view); remaining parts of lateral rim strongly rounded. Lateral rim infolding sloping upright into genital chamber, its distal margin ridge-shaped, detached from paramere. Ventral part of ventral wall densely pubescent with black shorter hairs, the dorsal part with very long hairs.

Paramere basally strenghten, than narrowed, with a small projection on outer side above the narrowed part, above the projection body of the paramere widened and than narrowed again; paramere on inner side excavated from the projection onwards, on outer side nearly straight, on inner side arcuatelly widened, apically ending with a triangularly reverted tip.

Outer female genitalia ( Fig. 4 ). Distal margin of subgenital plate rounded.

Measurements (mm). Male (holotype). Body length 17.66; head: length 2.70, width (including eyes) 2.48, interocular width 1.51; lengths of antennomeres: 1—4.32, 2—5.02, 3—3.35, 4—5.14; pronotum: length 3.43, width 4.64; scutellum: length 1.94, width 1.73; corium: length 8.48, width 3.19.

Female (paratype). Body length 20.74; head: length 3.29, width (including eyes) 2.86, interocular width 1.67; lengths of antennomeres: 1—4.91, 2—5.24, 3—3.56, 4—5.37; pronotum: length 4.21, width 5.40; scutellum: length 2.48, width 2.21; corium: length 11.61, width 3.78.

Variation. In the male specimen, there is a black coloured radius vein crossing the red apical spot on corium. We suppose this to be a subject of individual variability.

Differential diagnosis. Roscius diversus sp. nov. differs from the remaining Roscius species as follows: Roscius elongatus and R. quadriplagiatus has all abdominal ventrites unicolorously red. In R. illustris and R. parvulus the pronotal margins are black, only in posterolateral angles with large rectangular yellow spot (see Stehlík & Jindra 2008: Fig. 3 ). The male of R. diversus differs markedly from male of R. guilielmi by its ventrites III and IV widely whitish medially (red in R. guilielmi ). The female of R. guilielmi differs from female of R. diversus by wider extent of the red colouration, especially by ventrites III and IV neraly completely red, only laterally narrowly black, ventral laterotergite VII and lateral half of dorsal laterotergite VII red (in R. diversus both ventral and dorsal laterotergites VII black). The body of R. guilielmi is also wider, antennomere 1 shorter, bucculae elongated, distal margin of subgenital plate nearly straight, not rounded, etc (see also Stehlík & Jindra 2008: Fig. 2 ). Roscius circumdatus differs from R. diversus by distinctly wider pale spots on corium and red lateral margins of all abdominal ventrites of both sexes (black in R. diversus sp. nov.).

Etymology. The species epithet is the Latin adjective diversus , - a, - um, meaning different, referring to the unique sexual dimorfism in colouration of abdominal ventrites.

Distribution. South-western Central African Republic (Lobaye prefecture).

Figures

FIGURES 1–2. Habitus. 1—Roscius diversus sp. nov., ♂, holotype; 2—Roscius niger sp. nov., ♀, holotype.

FIGURES 3–5. 3–4—Roscius diversus sp. nov. 3–pygophore, dorsal view; 4—outer female genitalia. 5—Roscius niger sp. nov., outer female genitalia.