Necrophila (Chrysosilpha) Portevin, 1921

Ruzicka, J, Schneider, J, Qubaiova, J & Nishikawa, M, 2012, Revision of Palaearctic and Oriental Necrophila Kirby & Spence, part 2: subgenus Chrysosilpha Portevin (Coleoptera: Silphidae), Zootaxa 3261, pp. 33-58 : 37

Subgenus Necrophila (Chrysosilpha) Portevin, 1921

Chrysosilpha Portevin, 1921: 538 (type species Silpha formosa Laporte, 1832 , subsequent designation by Hatch 1928: 112). Silpha (Chrysosilpha) : Hatch 1928: 112 (as subgenus of Silpha , catalogue)

Necrophila (Chrysosilpha) : Peck 2001: 270 (as subgenus of Necrophila , catalogue)

Diagnostic description. Body flattened, length 12.0–18.5 mm. Body metallic blue or green (with light brown lustre in subteneral specimens), head sometimes with red brown to yellow gular region, last three antennomeres matt and black. Pronotum orange with four large spots arranged in quadrate position medially on the disc ( Fig. 1– 2); or, the pronotum is also metallic blue or green-blue with anterolateral or lateral part orange ( Figs. 3–6, 26–28). Proventrite metallic blue or green ( Fig. 34), or mostly orange, with metallic green only posteriorly on medial projection ( Fig. 33).

Head flattened, with row of long erect black setae behind the eye ( Figs. 30, 31). Frons with distinctly indicated fovea between the eyes, deep dorsal tentorial pits and a transverse crest posteriorly ( Figs. 30, 31). Eyes large, prominently protruding from the head outline, reniform ( Figs. 30, 31). Antennae with last four antennomeres forming distinct antennal club ( Fig. 35).

Pronotum hexagonal in shape, with broadly rounded posterolateral corners ( Figs. 25–28), anterior margin distinctly emarginate, posterior margin straight or regularly rounded ( Figs. 25–28). Surface with dense punctures, larger in size posteriorly than laterally, and only very superficial discally ( Figs. 25–28), without setation. Interstices between the puncures glossy, with very fine isodiametric microsculpture, sometimes only very superficial or without microsculpture discally. Anterior and posterior margin with dense row of stout, short, yellow, ventrally oriented setae.

Scutellum small, cordiform, with slightly sinuous lateral margins. Sparsely covered by fine to very fine, superficial punctures.

Elytra flattened, each elytron with three distinctly developed costae both in males and females, outer (third) costa shorter, not crossing bulges ( Figs. 1–6). Elytral epipleural ridge weakly elevated in dorsal view, reaching subapical part of elytra both in males and females ( Figs 1–6). Apex of elytron in males regularly rounded, or truncate with suture extended in minor apical denticle ( Figs. 3, 5); in females elongated slightly or distinctly (then with suture extended into distinct, acute, larger denticle) ( Figs. 2, 4, 6). Dorsal surface without reticulate sculpturing, with uniformly dispersed, fine and dense punctation, similar to that laterally on pronotum. Surface glossy, with distinct isodiametric microsculpture, slightly more coarse than on pronotum. Ventrally, elytral epipleura with larger punctures; posteriorly, in males with a prominent, oblique crest ( Fig. 37, indicated by arrow), which is not developed in females.

Hind wings fully developed, functional.

Ventral side of body and legs very glossy, with fine, transverse microsculpture.

Legs with almost straight tibia (only mesotibia subsinuate), tibia armed with several longitudinal rows of short, strong setae. Pro- and mesofemur only slightly expanded distally in males and simple in females, without distinct expansion. Pro- and mesotarsomere 1–4 moderately expanded in males (simple, unmodified in females). Meso- and metatarsal claws slightly asymmetrical in males ( Fig. 36), symmetrical in females.

Abdomen weakly sclerotized, with very short ventrites 2–5 ( Fig. 38), connected by long, black intersegmental membranes with distinct isodiametric microsculpture ( Fig. 39).

Male. Genital segment with longitudinal ventrite 9, extending anterior margin of tergum 9 ( Figs. 8, 12, 16); spiculum gastrale medium to large in size, relatively slender to robust, usually slightly asymmetrical ( Fig. 8, 12, 16). Aedeagus very small (length 2.8–3.0 mm), with median lobe shorter than robust parameres ( Figs. 7, 11, 15).

Female. Genital segment with tergum 10 oval, subhexagonal in shape in dorsal view ( Figs. 9, 13, 17). Stylus inserted laterally, slightly to distinctly longer than apex of coxite in ventral view ( Figs. 10, 14, 18).