S. Mahunka szerk.: Folia Entomologica Hungarica 46/1. (Budapest, 1985)
the remarks on B. koreanus. Coloration: (Queen) Head entirely or mostly black; frons sometimes with considerable admixture of yellowish hairs. Mesosoma ochre; dorsum with distinct interalaris or rather centralis having anterior contour roundly convex; area around tegulae black with variable admixture of ochreous hairs; scutellaris with laterobasal extremity sometimes admixed with sparse black hairs; pleura below and near propodeum with variable extent of black area; venter black. Metasoma Tj pale ochre, virtually without dark hairs; 1 basally ochre, apically dark; the pale area shaped crescent, but mediapically more or less narrowed; Tg entirely black, apical margin sometimes with sparse admixture of pale ochreous hairs; T 4 mediobasally or mediolongitudinally black, otherwise pale ochre, but amount and distribution of black hairs variable; T,- ochre yellow widely black mediolongitudinally but intermixed with yellowish hairs of variable amount; venter predominantly black but apical sterna with admixture of yellowish hairs. Legs black. (Worker) Basically similar to queen. A darker specimen quite similar to queens except reduced dark area on pleura and T 2 _4 and fair admixture of yellowish hairs on coxae, trochanters, mesoand metasomal venters: The other paler specimen with pleura nearly entirely yellowish except near propodeum; dark area on mesosomal dorsum dwindling to obscure centralis strongly intermixed with ochreous hairs; dark area on T_ reduced to a large lateral patch; meso- and metasomal venters, coxae and trochanters mostly yellowish; femora and tibiae black with fair amount of yellowish hairs. (Male) Head ochreous yellow; vertex and frons laterally with sparse admixture of black hairs. Mesosoma ochreous yellow; dorsum mediodiscally with a few black hairs or forming narrow and inconspicuous centralis; in one specimen pleura with black area near propodeum. Metasoma T^ ochre with virtually no black hairs; Tg basal half or two-thirds crescently ochre, otherwise black; Tg black, but apical margin narrowly ochreous laterally; T. basal half or three-fourths crescently black, apically ochre yellow with sparse to strong admixture of black hairs; Tg_g mediolongitudinally black, laterally ochre yellow; In the paler individual black area on Tg represented by sparse black hairs, and that on Tg strongly mixed with pale hairs; T^ entirely black; venter entirely or prodominantly yellowish. Legs black; coxae, trochanters, femora entirely or predominantly yellowish; tibiae admixed with sparse yellowish hairs; longer corbicular hairs with lightened tips. Specific distribution: NE China (Manchuria), Ussuri, Korea (SKORIKOV 1909, 1933). Bombus (Megabombus) koreanus (Skorikov) Loc. No. 8: 2 qq, 5 ww, 2 mm; ShôyÔ-san, Keikido (= Kyonggi-do), Jul. 4 '31: 1 m; Fig. 18. Collected in SW alone while SAKAGAMI recorded this species from SE. The male has so far not been described (see SKORIKOV 1933). The description is given together with differences from three Far-East Asian Megabombus species, B. yezoensis , consobrinus and czerskii (Table 1). Diagnosis: The male of this species is distinguished from the three species particularly by the following features (cf. also Table 1): from yezoensis by shining ocellocular impunctate area and surface above, smaller F 2 /F^ ratio, shorter pubescence; from consobrinus by denser and coarser punctures on postocellocular area and T^, narrower ocellocular impunctate area, shorter malar space, shorter pubescence; from czerskii by narrower ocellocular punctate band, denser and coarser arser punctures on post-ocelllocular area, smaller F^/F^ ratio, subequal length of F^ with Fg. Description: Head: Area just behind ocellocular impunctate area coarsely and strongly punctate, interspace rugged and dull (Fig. 20A); ocellocular impunctate area wide, well-defined, finely shagreened and dull along ocellocular punctate band (Fig. 20B); ocellocular punctate band narrow but »well defined (Fig. 20C); interocellar punctate band with punctures round, distinct, relatively large and remote one another, interspace not polished (Fig. 20D); F-tFgrF- = 20:11:19; malar area moderately long as a Megabombus species (minimum distance from compound eye to madibular base/ width of mandibular base = 1.81-1.83); clypeus with basal longitudinal depression narrow but fairly distinct with bottom line well demarcated (Fig. 21); mediapical impunctate area wide and relatively well defined (Fig. 22); apical depression weak, with semiflat marginal ridge; punctures above the depression large (Fig. 22). Mesosoma: Impunctate scutal area wide and well defined (Fig. 23); mid basitarsus four times as long as the maximal transverse width (length/width = 4.2), with the longest marginal hairs approximately as long as the width; hind tibia nearly four times as long as the maximal width (length/width = 3.7-3.9) to only slightly shorter, with the longest hairs slightly longer than tibial width (length/width = 1.1-1.2); corbicular surface shining, apically with sparse short hairs; apical margin without long bristles (Fig. 24); hind basitarsus three times as long as the maximal width or a little longer (length/width = 3.1-3.3), with the longest marginal hair as long as or slightly shorter than basitarsal width (length/width = 0.7-1.0); posterior contour near apex
