Pentatominae

Kment, Petr, 2015, Two new genera of Madagascan Pentatominae (Hemiptera: Heteroptera: Pentatomidae), Acta Entomologica Musei Nationalis Pragae 55 (2), pp. 591-624 : 619-620

Key to the genera of Madagascan Pentatominae with sharp margins of the head

The key is adapted from CACHAN (1952) and KMENT (2008) and expanded. It applies to genera with lateral margins of the head, and more or less also the margins of the pronotum and corium explanate and sharp, and the antennal segment I short, not surpassing the lateral margin of the head and not visible in dorsal view.

1 Humeri of pronotum not prominent, rounded, unarmed. ............................................... 2

– Humeri of pronotum prominent, spinose or lobate. ....................................................... 5

2 Body short and oval, body length 3.5–8 mm. Head large, parabolic. Scutellum large, shortly triangular, not incised at apex of clavi (frena), posteriorly broadly rounded. Macropterous. External scent efferent system of metathoracic scent glands with peritreme and evaporatorium well developed............................................................................... ........................... Sciocorini : Sciocoris Fallén, 1829 (8 species keyed by CACHAN 1952)

– Body elongate to widely oval. Head triangular or semicircular, not parabolic. Scutellum U-shaped or triangular, incised at apex of clavi (frena), and narrowly rounded apically. ......................................................................................................................................... 3

3 Small species (body length 7.4 mm). Body elongate, narrow (body length: abdomen width 2.6: 1), lanceolate in shape (widest across abdominal segment IV). Head narrowly triangular (head length: width across eyes 1.24: 1). Scutellum short, widely rounded posteriorly. Brachypterous, corium posteriorly truncate, nearly reaching apex of scutellum, membrane rudimentary. External scent efferent system of metathoracic scent glands reduced, peritreme and evaporatorium not developed. ......................................................... ............................... Aeptini: Aeptus Dallas, 1851 (one undescribed species in MRAC).

– Large species (body length 11–13 mm). Body more robust, elongate-oval or widely oval, not lanceolate. Head broadly triangular or semicircular. Scutellum long, triangular. Macropterous with well developed membrane. External scent efferent system of metathoracic scent glands with peritreme and evaporatorium well developed. Myrocheini ...........................................................................................................................................4

4 Body elongate-oval, pale brown. Head elongate, longer than wide, triangular, head margins slightly bisinuate in front of eyes. Pronotum trapezoid with anterolateral angles right-angled and lateral margins straight, slightly undulated. Protibiae not dilated. Body length 11–12 mm. .............................................................................................................. ................ Dissocolpus Bergroth, 1905 : D. fissiceps Bergroth, 1905 (see CACHAN 1952)

– Body widely oval, brick red. Head slightly wider than long, semicircular, head margins strongly arcuate in front of eyes. Anterolateral angles of pronotum widely arcuate, marked by a small tooth; lateral margins of pronotum arcuate. Protibiae dilated. Body length 11.7–13 mm. ............................................................ Jitka gen. nov.: J. elegans sp. nov.

5 Large (body length 12.5–23 mm). .................................................................................. 6

– Small (body length 4.7–8.4 mm). ................................................................................... 7

6 Head and anterior part of pronotum, in lateral view, inclined nearly orthogonally downwards. Head with strong anteocular spine followed by distinct incision in front of eyes. Lateral margin of each ventrite with two sharp triangular projections. Labium reaching mesocoxae. Ventrites convex, not grooved. Body brown, humeri black. Body length 18.5–22.7 mm ..................................................................................................................... .......... Tricompastes Cachan, 1952 : T. gigas Cachan, 1952 (see KMENT & BAENA 2015)

– Head and anterior part of pronotum, in lateral view, inclined obliquely (ca. 45°) downwards. Head margin in front of eyes straight, without anteocular spine or incision. Lateral margin of connexivum undulated. Labium reachimg base of ventrite IV, ventrites III and IV (basally) grooved. Body brick red. Body length 12.5–15 mm. ............................. ........................................................................... Nene gen. nov.: N. undulatum sp. nov.

7 Body more elongate, pale ochraceous. Head lacking anteocular spines. Humeri of pronotum markedly produced anteriad, narrowing, and usually with bifid apices. Scutellum dorsally flat, without a hump. Lateral margins of connexivum straight. Body length 5.8– 8.3 mm. .............................................................................................................................. ........................... Anoano Cachan, 1952 : A. pronotalis Cachan, 1952 (see KMENT 2012)

– Body shorter and wider, brown. Head with one anteocular spine on each side. Humeri of pronotum produced laterad and less markedly anteriad, wide and with widely rounded to nearly quadrangular apices. Scutellum often bearing a dorsal hump. Lateral margins of connexivum more or less sinuate. Body length 4.7–7.5 mm. ............................................ .................................... Triplatyx Horváth, 1904 (6 species keyed by KMENT 2008, 2011)