S. Mahunka szerk.: Folia Entomologica Hungarica 60. (Budapest, 1999)

Key to the oriental Corymbas species after Malaise, (1945) and Togashi (1972) completed with the new species 1. Antenna with at least the 4th segment white. 2. Antennae entirely black 3. 2. Antennae black, joints 4 and 5 white. The fore and mid tibiae and tarsi, and in the male, also the apical half of the femora reddish 3. Antenna black, apical portion of 3rd joint, 4th and basal half of 5th joints white. Body black; labrum, anterior margin of tergite 3, sides of tergites 3rd^lth and sternites 2nd-3rd white. Legs black, apical portion of fore femora, anterior surface of fore tibiae and fore tarsi pale yellowish brown C. chujoi Togashi, 1972 3. Fore wings clear or subhyaline. Apex of the wings infuscated from base of stigma, clear basally, sometimes more or less nebulose. All legs red with black coxae and trochanters; hind trochanters whitish in females. Black; whitish are: labrum, the narrow pronotal margin in the females, and in both sexes the basal sternites of abdomen. The 3rd abdominal tergite almost always reddish, and the broad anterior margin and the middle of the 5th one mostly reddish. Length 8.5-9.5 mm (males), 11-13 mm (females) C. birmana Malaise, 1945 4. Length of the females 10-12 mm, of the males 8-10 mm. The abdominal tergites 3rd and 4th reddish yellow with narrow black lateral stripes in the males, the same tergites with pale lateral spots, and the 3rd one mostly also with pale anterior margin in the females. 6. Length 13-16 mm females, 10-14 mm males. 5. 5. Abdominal tergites with fulvous lateral spots in both sexes, the 3rd one rarely with pale anterior margin. Basal 2/3 of the hind tibiae, and in the males, sometimes also hind femora dark reddish brown. Head not narrowing behind the eyes in the females, only subangustate in the males. Abdomen strongly shining, without distinct cross-striation. Length 16 mm females, 14 mm males C. coreana Konow, 1903 Head strongly narrowing behind the eyes in both sexes. Abdomen minutely cross striated towards the apex with opaque general lustre in the females. Length of males 10-12 mm, of females 13-14 mm C. coreana nipponica (Takeuchi, 1936) Females: 3rd abdominal tergite yellow, 2nd, 4th, 5th sometimes the 6th black with yellow lateral spots, 2nd with yellow middle line. Femora, tibiae, tarsi yellow but hind femora black C. nigroyunanensis sp. n. 6. Face around the frontal area minutely rugose, opaque. Surface between punctures of mesopleura with micro-sculpture and quite opaque. Supra-antennal pit shallow. Hind legs quite black C.fujisana (Matsumura, 1912) Head above antennae smooth and strongly shining. Mesopleuron densely punctured, shining. Supra-antennal pit deep and large, deeper than the height of an ocellus. Hind tibiae and metatarsi dark reddish brown, infuscate towards the apex in females. The rest of tarsomeres more or less sordid white C. aperta (Takeuchi, 1919)