![]() Focused Scientific Surveying of Bumble Bees was carried out by bumble bee expert Sheila Colla at sites known to have harboured Rusty-patched Bumble Bees in the past, including Pinery Provincial Park.Most authors follow Michener (2007) and include those groups in the subfamily Apinae with the honey bees. Some authors separate bumble bees and orchid bees into the subfamily Bombinae. ![]() Hymenoptera (ants, bees, wasps, and sawflies)Īpocrita (narrow-waisted wasps, ants, and bees)Īculeata (ants, bees, and stinging wasps)Īpidae (honey bees, bumble bees, and allies) Minnesota Bee Atlas, University of Minnesota Extension, © 2023 Regents of the University of Minnesota, Bombus affinis (rusty-patched bumble bee), retrieved. Fish and Wildlife Service, Rusty patched bumble bee (Bombus affinis), retrieved. there are post 2005 records, including citizen science records (dark green)Įnvironmental Conservation Online System (ECOS), U.S.there are no records after 2005 (light green).rusty-patched bumble bee is believed to occur but for which there are no records (yellow).The map at left includes counties in which Rusty-patched bumble bee usually nests in the ground in an abandoned rodent burrow. The hairs on abdominal segments 1 and 2 are entirely yellow. The band of hairs on the vertex has a few pale hairs intermixed. It is similar to the worker, but the abdomen has 7 segments, and the antennae have 13 segments. The male (drone) is somewhat larger, ½ ″ to 11⁄ 16 ″ (13.0 to 17.5 mm) in length. The second abdominal segment is entirely yellow, with no rusty patch. ![]() The thorax has a round, bare, black spot in the middle surrounded with intermixed black and yellow hairs. The pubescence is shorter and less dense. The queen is similar but larger, 13⁄ 16 ″ to ⅞ ″ (21 to 22 mm) in length. The legs are black and are covered with mostly black hairs. The wings are clear and lightly tinted brown. On the remaining segments the hairs are entirely black. On the second segment it is mostly yellow except for a rusty-red patch in the middle. ![]() The hair on the first segment is entirely yellow. The abdomen has six segments and is densely covered with relatively long hairs. Between the wings there is a band of black hairs that extends toward the rear in a V shape. The hairs near the flap-like covering of the wing bases (tegulae) are black intermixed with yellow. The upper side of the thorax is densely covered with long, mostly yellow hairs. The tongue is short, shorter than any other bumble bee species. The first flagellomere is slightly longer than the third, and the third is somewhat longer than the second. The scape is long, slightly more than half as long as all of the flagellomeres together. The antennae have 12 segments consisting of one basal segment (scape), one small connecting segment (pedicel), and ten more segments (flagellomeres). The hairs on the head are entirely black, including a dense band of hairs on top of the head (vertex) at the rear. The width of the abdomen is 3⁄ 16 ″ to 5⁄ 16 ″ (5 to 8 mm). The female (worker) bee is 7⁄ 16 ″ to ⅝ ″ (11 to 16 mm) long. It currently occurs in Minnesota, Iowa, Wisconsin, Illinois, and Indiana, and there are a few widely scattered recent records from Ontario, Quebec, Ohio, New York, Massachusetts, Virginia, and West Virginia. Since the 1990s populations have declined severely in 87% of its historical range. It was historically common throughout most of its range, which extended from Maine to Georgia, west to Minnesota, with a few individuals found in North Dakota. Rusty-patched bumble bee is a relatively large colonial bumble bee.
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