Chilocorus Leach, 1815

Li, Wenjing, Huo, Lizhi, Wang, Di, Ahrens, Dirk & Wang, Xingmin, 2018, Contribution to the genus Chilocorus Leach, 1815 (Coleoptera: Coccinellidae: Chilocorini), with descriptions of two new species from China, European Journal of Taxonomy 469, pp. 1-34 : 3

Genus Chilocorus Leach, 1815

Chilocorus Leach, 1815: 116 .

Type species

Coccinella cacti Linnaeus, 1767 , by monotypy.

Diagnosis

The genus Chilocorus can be distinguished from the other genera of the tribe Chilocorini by the following characters: body with dorsum glabrous, rarely with pubescence; outer elytral margin slightly reflexed, without distinct bead; antenna stout, composed of 8 antennomeres ( Fig. 3e ); terminal maxillary palpomere elongate, from 1 to 2 times as long as basal width, with sides nearly parallel or moderately expanded to apex ( Fig. 3f ); prosternal process long, narrow and subparallel without carina; legs with stout femora, tibiae with a triangular tooth at basal ½, without tibial spurs ( Fig. 3 i–j); tarsal claws stout, with approximately rectangular basal tooth, about ½ length of claw ( Fig. 3k ).

Description

BODY. Broadly oval or roundish, hemispherical and strongly convex. Dorsum glabrous, rarely pubescent. Head relatively large, 0.50–0.65 times pronotal width, covered with short, greyish pubescence; antenna composed of eight antennomeres, relatively stout, scape asymmetrical, scape and pedicel subequal in length and width, antennomeres 3–7 gradually broadening and elongated, antennomere 8 subconical, distinctly longer than antennomere 7 ( Fig. 3e ). Mandible unidentate, prostheca indistinct, lateral margin of mandible strongly curved ( Fig. 3g ). Terminal maxillary palpomere elongate with sides nearly parallel or expanded to apex, rarely subquadrate, apical margin obliquely truncate ( Fig. 3f ). Terminal labial palpomere subconical ( Fig. 3h ).

PROTHORAX. Descending anteriorly. Prosternum T-shaped, in front of coxae distinctly longer than basal width of prosternal process. Prosternal process moderately broad, subparallel or slightly expanded to apex, truncate at apex, without carinae ( Fig. 3d ). Mesoventrite approximately trapezoidal, anterior margin of mesoventrite straight. Meso-metaventral process narrow, junction straight, with visible suture. Scutellum small and triangular. Elytra distinctly wider than pronotum at base, surface finely or coarsely punctate. Elytral epipleura distinctly oblique, with or without grooves. Abdomen with five ventrites in female and six ventrites in male. Abdominal postcoxal lines incomplete, not curved, posteriorly reaching or very close to hind margin of ventrite. Legs with stout femora, tibiae with a triangular tooth at basal ½, without tibial spurs ( Fig. 3 i–j); tarsal claw with basal tooth ( Fig. 3k ).

Figures

Fig. 3. Chilocorus nigricaeruleus Li & Wang sp. nov., holotype. a. Dorsal view. b. Lateral view. c. Frontal view. d. Prothorax. e. Antenna. f. Maxilla. g. Mandible. h. Labium. i. Front leg. j. Hind leg. k. Tarsal claw. l. Abdomen. m. Penis. n. Apex of penis. o. Tegmen, lateral view. p. Tegmen, ventral view. Scale bars: 0.1 mm. (SCAU (E) 11287)