33. Bombus (Thoracobombus) tricornis Radoszkowski

(Figs 68, 69)

Bombus tricornis Radoszkowski, 1888:319 .

Material examined. 1 queen (IAB).

Distribution in North China. Rare at medium elevations of the Songshan nature reserve of the Yanshan mountains in northern Beijing. 1 locality (Fig. 68) at 1590 m (IAB).

Similar species in North China. This species is similar in its brown colour pattern to B. pascuorum, schrencki, B. hedini and B. atripes (see the key; Figs 55, 57, 59, 69, 71).

Distribution in China. Beijing, Jilin, Heilongjiang (IAB).

Forage plants. LAMIACEAE: Vitex negundo .