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General DescriptionBombus nevadensis belongs to the subgenus Bombias in which females have large ocelli well below the supraorbital line and malar space longer than wide; males have protuberant compound eyes, convergent above, with straight penis valves (Thorp et al. 1983). Both sexes of Bombias are further distinguished by hind tibia with a fringe of very short hairs (Williams 2008). Bombus nevadensis females have head and pleura covered with black pile, while the face and pleura of males have yellow pile. The dorsal side of the first three abdominal segments is covered with yellow pile, while the rest are covered with black pile in both sexes (Franklin 1912). The only close ally in the western hemisphere, Bombus auricomus, can be distinguished by a broad black interalar band on females and by apical abdominal segments with black pile on males. Bombus nevadensis are large bumble bees with queens varying in length from 18 mm to 22 mm; in wing spread from 42 mm to 48 mm; and in width of second abdominal segment from 9.5 mm. Workers range in length from 15 mm to 18 mm; in wing spread from 38 mm to 42 mm; and width of second abdominal segment from 9 mm to 9.5 mm. The length of males varies from 13 mm to 17 mm; wing spread from 32 mm to 37 mm and the width of the second abdominal segment from 7 mm to 8.5 mm.