Entisberus bergrothi, Kondorosy, 2008

Kondorosy, Előd, 2008, A revision of the Entisberus group (Hemiptera: Heteroptera: Rhyparochromidae), Acta Entomologica Musei Nationalis Pragae 48 (2), pp. 591-610 : 594-598

Entisberus bergrothi sp. nov.

( Figs. 2, 4 , 15 )

Entisberus archetypus (misidentification): BERGROTH (1918): 105 (redescription).

Type locality. Philippines.

Type material. HOLOTYPE: J, ‘ Irri [pr], Hortorium [hw] / 14°10′ N, 121°15′ E. / 4 km., E. Los Banos, / Laguna Prov., PHILIPP. [pr], 31. 10. 1979 [hw] // M. R. Wilson / x. 1979 // Brit. Mus. 1983-172’ ( BMNH) . PARATYPES: PHILIP- PINES: J, ‘ Luzon / Laguna, Mt. Makiling / 13-18. 11. 1992 / leg. H. Zettel (1)’ ( NHMW) ; J, ‘ Mt. Makiling / Luzon, Baker [pr] // Entisberus / archetypus / Dist. [hw]’ ( HNHM) .

Description. Macropterous male. Structure. Body elongate, almost dull, only membrane and part of venter moderately shining; covered with short, decumbent, relatively sparse hairs, rather densely punctate.

Head short, as long as high, conical in lateral view, only very slightly higher than eyes, densely punctate. Eyes large, bare, strongly protruding but not pedunculate, laterally far surpassing anterolateral angles of pronotum, slightly projecting backwards, touching pronotum. Ocelli well developed, partly covered by pronotal collar. Antenniferous tubercle well developed but short. Bucculae small, apically rounded, gradually narrowing posteriad, parallel with ventral side of head, reaching middle level of eyes. Ventral side of head with a pair of minuscule, hardly visible teeth at base of bucculae. Antennae slender, segments nearly cylindrical, with dense decumbent pubescence and rather sparsely distributed long, prominent hairs; segment I surpassing apex of clypeus by more than half of its length; segment II longer than I; remaining segments usually shorter than segments I and II (their relative lengths highly variable). Labium very short, reaching fore coxae, segment I reaching middle of eyes in lateral view, segment II longest, reaching base of pronotal collar, remaining segments shorter than segments I and II.

Thorax. Pronotum gibbous, anterior part very densely, posterior lobe more sparsely punctate, pronotal collar well delimited. Transverse impression very shallow medially, deeper laterally, situated well behind middle. Lateral margins narrowly explanate but not laminate at level of transverse impression, abruptly terminating before humeral angles, with fine tubercles in anterior half. Anterior lobe of pronotum strongly gibbous, its posterior part horizontal, anterior part vertical. Basal margin of pronotum slightly convex, laterally depressed, anterior margin straight. Scutellum triangular, with very distinct, smooth, and elevated Y-shaped carina, reaching neither apical not basal angles, its lateral arms directed towards posteriad of basal angles. Clavus with three regular rows of punctures. Corium with two rows of punctures along claval margin, one row along hind margin, mesocorium with dense, irregularly distributed punctures. Costal margin of corium convex at base, concave at level of apex of scutellum, convex apically, basal half with small tubercles, apical margin straight except the slightly concave inner end. Membrane with four well visible veins. Sternum evenly punctate, middle of mesosternum with acute, sometimes small spine at anterior half. Metasternal scent gland area small, occupying less than one third of metasternum. Legs slender, without spines and strong bristles.

Abdominal venter with distinct median keel well visible on sternites II-IV. Intersegmental suture between sternites II-VI longitudinally striolate.

Male genitalia. Genital capsule with opening about half as wide as total pygofer width, on caudal part with two rather small teeth. Paramere with rounded lobes, distal end relatively short ( Fig. 15 ).

Colouration. Body blackish brown, contrasting with light posterior pronotal lobe, hemelytra, and appendages. Posterior pronotal lobe and hemelytra yellowish brown with brown punctures and with faintly delimited darker brown patches. Scutellum rather uniformly yellowish brown or dark basally, scutellar carina bright yellow. Each fore wing with three sharply delimited dark patches on corium: one surrounding a yellowish spot on endocorium at end of clavus, another streak on exocorium at same level, and one at the apex of exocorium. Membrane whitish with dark nebulae. Antennae, labium and legs almost uniformly yellow, with coxae black, basal half of antennal segment I brown.

Measurements (all in mm; holotype J first, paratypes (2JJ) in parentheses). Total body length 3.60 (3.15-3.30). Head: length 0.45 (0.32-0.42), width 0.82 (0.70-0.75), interocular space 0.42 (0.32-0.40). Pronotum: length 1.15 (1.00-1.05), width at base (= body width) 1.45 (1.28-1.35). Scutellum length 0.75 (0.60-0.65), length of claval commissure 0.30 (0.25-0.30). Length of antennal segments I 0.50 (0.38-0.42), II 0.62 (0.45-0.52), III 0.45 (0.32-0.38), IV 0.50 (0.40). Lengths of labial segments of holotype I 0.30, II 0.30, III 0.20, IV 0.20.

Female. Unknown.

Differential diagnosis. The most apparent difference between Entisberus bergrothi sp. nov. and E. archetypus is the strongly gibbous anterior pronotal lobe of the new species. Other distinctive characters are as follows (character states in E. archetypus in parentheses): middle line of mesosternum with an acute spine (unarmed); pronotum and corium with similar punctures (inner row of corium composed of larger punctures than those of pronotum); anterior part of pronotum without furrows (with a pair of fine oblique impunctate furrows similar to those occurring in the Lygaeinae); Y-shaped carina of scutellum of almost uniform height, impunctate (middle part of the carina higher than lateral parts, partly punctate); hemelytra dull (shining); body with stronger hairs (with finer hairs). Entisberus archetypus has a unique shape of the paramere, not similar to the ‘ Drymini type’ ( Fig. 14 ), while the paramere of E. bergrothi sp. nov. is similar to parameres of Retoka and another drymine genera ( Fig. 15 ).

Etymology. This species is dedicated to the memory of Ewald Bergroth, who first recorded it from the Philippines but misidentified it as E. archetypus ( BERGROTH 1918) .

Distribution. Philippines (Luzon ( BERGROTH 1918, this paper), Mindanao ( BERGROTH 1918)).

Note. BERGROTH (1918) accompanied his record of the species with a detailed redescription, erroneously attributing the differences between Distant’s original description and his specimen to presumed errors in Distant’s paper. Since Bergroth’s description does not fit the holotype of E. archetypus , he certainly did not examine Distant’s type. Entisberus specimens collected in the Philippines were found in various museums, however, attempts to locate the specimens identified by Bergroth failed (L. Huldén, FMNH, pers. comm.; G. Lindberg, NHRS, pers. comm.).

Figures

Figs. 1-4. Habitus (1-2 – body in dorsal view; 3-4 – head and thorax in lateral view). 1, 3 – Entisberus archetypus Distant, 1903; 2, 4 – E. bergrothi sp. nov.

Figs. 14-21. Parameres. 14 – Entisberus archetypus Distant, 1903 (specimen from Vietnam: Yen Bai Province); 15 – E. bergrothi sp. nov.; 16 – Retoka hirsuta sp. nov,; 17 – R. gibba (Zheng, 1981); 18 – R. esakii (Slater & Hidaka, 1958); 19 – R. curvipes sp. nov.; 20 – R. stysi sp. nov.; 21 – R. paraminuta sp. nov.