Camponotus concavus

Kim and Kim (1994) reported this species is found in trees, is not easy to find during the day, and after September they come down under the trees. This seems to suggest the ant inhabit trees during the summer, are nocturnal, and move to the ground in the fall.

Identification
Kim and Kim (1994) - Though this species resembles Camponotus kiusiuensis, they can be separated following characters:

C. concavus: Clypeus, much concave. Colour, black and lustrous. Habitat, in dead trees.

C. kiusiuensis: Clypeus, a little concave. Colour, dark brown, except brown legs. Habitat, in trees and vicinity of roots.

Distribution based on Regional Taxon Lists
Palaearctic Region: Greece, Republic of Korea.

Nomenclature

 *  concavus. Camponotus concavus Kim & Kim, 1994: 285, figs. 1-3 (w.) KOREA. [Unresolved junior primary homonym of concava Dalla Torre, above.]

Worker
C1=72.50-lIU8, SI 1=100.00-153.14, SI 2 = 77.9:-127.78, EW = 0.295-0.443, EL=0.422-0.633, HW= l.298-3.045, JL= 1.612-3.045, SL= 1.881-2.418.

Body length 7 -13 mm. Body dark black. Legs black to reddish brown. Head black and a little lustrous and pubescenses distributed sparesly. Head length 0.76-1.11 times as head width. Mandibles dark brown with weak punctures and each punctures with yellowish hairs. Teeth black and five, and the more toward the end, the sharper. Clypeus black with minute punctures all over and anterior area concave with a pair of long yellow hairs. Frontal triangle almost indistict and connected area with frons indistinct. Vertex with abundant minute punctures and three pairs of long yellowish hairs and posterior area elliptical.

Compound eyes greyish black and protruded considerably and width 0.55-0.83 times as length. Antennal fossae comparatively small and in frontal view, base of scape protruded a little. Antennal scape black with minute soft hairs and much extending backward beyond posterior area of head. Antennal scape length 0.89-1.28 times as head length and basal segment of funiculus a little brownish. Funiculus yellowish brown and eleven segmented with abundant minute recumbent hairs.

Thorax black with abundant minute punctures. Pronotum black with abundant pubescences, but erect hairs absent. The groove between pronotum and mesonotum and the groove between pronotum and anepisternum distinct. Mesonotum black with minute punctures and hairs and a pair of erect hairs present on mesonotum. Metathorax black with a pair of spiracles and minute punctures.

Propodeum black and a little lustrous, with minute punctures and minute recumbent hairs and three pairs of long, sharp, yellow, erect hairs on the top. A pair of spiracles looks like a slit crack. Propodeum gently-sloping, but total slope from pronotum to propodeum arched strongly. Petiole black and thick scale form with three pairs of long, erect, yellowish, minute hairs on the top.

Abdomen black, five segmented, lustrous as head and thorax, with abundant pubescences. The connected areas between each segment a little brownish and sharp erect hairs distributed in a row and five or more erect hairs present on the tergite.

Type Material
Holotype; worker, Paekyang temple, Jeonnam, 27. VI. 1992 (K.G. Kim); Paratype; 4 workers, Paekyang temple, 27. VI. 1992 (K.G. Kim); 6 workers, Mt. Keryong, Chungnam, 20. IX. 1992 (K.G. Kim); 20 workers, Kochang, Jeonbug, 1. VII. 1993 (K.G. Kim); 30 workers, Mt. Keryong, 20. IX. 1993 (K.G. Kim) preserved in Dept. of Molecular Biology, Wonkwang University.