Philonthus chappuisi Bernhauer, 1939

Hromádka, Lubomír, 2010, A revision of the Afrotropical species of the Philonthus arrowianus species group (Coleoptera: Staphylinidae: Philonthina), Acta Entomologica Musei Nationalis Pragae 50 (1), pp. 131-144 : 134

Philonthus chappuisi Bernhauer, 1939

( Figs 6–9 )

Philonthus chappuisi Bernhauer, 1939: 84 .

Type locality. Kenya, Mt. Aberdare, Kinangop, 2600 m a.s.l.

Type material examined. HOLOTYPE: J, ‛ KENYA, Mais forest Kinangop , Mt.Aberdare ,ver´s Ouest 2600m, Mission de l´Omo, C. Arambourg, P.A. Chappuis & R. Jeannel, 1932 – 33. // Philonthus chappuisi Bernhauer , TYPE [ochre oblong label, handwritten]’ ( FMNH).

Redescription. Body length 10.9 mm, length of fore body (to end of elytra) 5.0 mm.

Colouration. Head black, maxillary and labial palpi yellow-brown, mandibles dark brown, antennae black, base of antennomere 1 yellow-brown, clypeus along anterior margin and antennal sockets narrowly yellow-brown, pronotum black-brown, elytra dark brown with strong coppery shine, abdomen black-brown, femora and tarsi yellow-brown, tibiae of all legs black.

Head rather flat, slightly wider than long (ratio 30: 28), parallel-sided, posterior angles marked, eyes slightly projecting, somewhat shorter than temples (ratio 10: 11), between eyes with four punctures, distance between medial interocular punctures five times the distance between medial and lateral puncture; temporal area with many coarse punctures; surface with microsculpture consisting of transverse waves.

Antennae long, when reclined exceeding posterior margin of pronotum by length of antennomere 11. All antennomeres longer than wide. Relative lengths of antennomeres: 1 = 12; 2 = 6; 3 = 7; 4–6 = 6; 7 = 5; 8 = 4.5; 9–10 = 4; 11 = 7.5.

Pronotum slightly wider than long (ratio 40: 38), hardly narrowed anteriad, each dorsal row with four punctures, distance between punctures 3–4 somewhat smaller than distance between punctures 2–3, each sublateral row with two punctures, puncture 1 situated on level between punctures 2–3 of dorsal rows, surface with microsculpture similar to that on head.

Scutellum finely and densely punctate, punctures equal in size to eye facets, separated by distance smaller than diameter of puncture.

Elytra combined distinctly wider than long (ratio 52: 46), slightly widened posteriad, very densely and finely punctate, diameter of punctures somewhat larger than eye facets, distance between punctures smaller than diameter of punctures, surface without microsculpture; setation dark.

Abdomen wide, slightly narrowed anteriad and posteriad from visible tergite III. First four visible tergites with two basal lines, elevated area between lines impunctate, punctation of visible tergites somewhat finer than that on elytra, becoming finer and sparser towards posterior margin of each tergite, surface between punctures without microsculpture; setation similar to that on elytra.

Legs. Metatibia vaguely longer than metatarsus (ratio 35: 33), lengths of metatarsomeres: 1 = 10; 2 = 5; 3 = 4.5; 4 = 4; 5 = 8.

Male. Protarsomeres 1–3 markedly dilated and sub-bilobed, each covered with modified pale setae ventrally, sternite IX ( Fig. 9 ), aedeagus ( Figs. 6–8 ).

Female. Unknown.

Differential diagnosis. Philonthus chappuisi is similar to P. trilobatus but differs from it by wider elytra, lighter legs and a different shape of the aedeagus.

Distribution. Kenya, known only from the type locality.

Figures

Figs. 1–14. Philonthus species. 1–5 – P. arrowianus Bernhauer, 1931 (1 – aedeagus, ventral view; 2 – aedeagus, lateral view; 3 – apex of of paramere with sensory peg setae, ventral view; 4 – apical portion of male sternite VIII, ventral view; 5 – male sternite IX, ventral view). 6–9 – P. chappuisi Bernhauer, 1939 (6 – aedeagus, ventral view; 7 – aedeagus, lateral view; 8 – apex of paramere with sensory peg setae, ventral view; 9 – male sternite IX, ventral view). 10–14 – P. currax sp. nov. (10 – aedeagus, ventral view; 11 – aedeagus without paramere, ventral view; 12 – aedeagus, lateral view; 13 – apex of paramere with sensory peg setae; 14 – apical portion of male sternite VIII, ventral view).