Throughout Wisconsin, but typically associated with more open habitats south of the North woods. Body hair is short and even and ocelli are high on the face. The species has become rarer, declining in number mainly in northern parts of its range. Workers are average sized at 1.4 to 1.8 cm and males are slightly larger than females at 1.6 to 2.2 cm. Tergite 1, or the most anterior back portion of the queen is often yellow especially in the middle. B. pensylvanicus is as important as B. affinis – the rusty-patched bumble bee – because it has lost even more of its range than the rusty-patch. Bombus vagans, Half-black Range notes - All Bumble bee records were split into two groups, current (2000-2019) and historic (pre-2000). Bombus pensylvanicus was once one of the most widespread bumble bees in North America, ranging from the eastern U.S. through the Great Plains, with the subspecies B. pensylvanicus sonorous known from the deserts of the Southwest to Oregon (Williams et al. Bombus pensylvanicus is a large bumble bee with the queen measuring from 21-25 mm, the worker from 14-18 mm, and the male from 16-22 mm in length. Bombus pensylvanicus Common name: American bumble bee. Its range extends from Quebec and Ontario, Maryland south to Florida, then west to Minnesota, South Dakota, Nebraska, Colorado, New Mexico and Mexico (Anonymous 2011). 8-digit Hydrologic Unit Code (HUC) watershed polygons (USDA 2019) were populated with species presence information in both time periods. The queen is mostly black, including the legs, spurs and tegulae (base of wing). ... but still routinely found in its core range to the south as evidenced by the many Bugguide images. 2c). 2014). [8] In terms of characteristics within the hive, a larger queen measures 22–26 mm compared to worker at 13–19 mm. Bombus pensylvanicus ranges from the Eastern Great Plains to eastern and central US and southern Canada, and Mexico. B. pensylvanicus generally nests in fields of long grass, but may sometimes nest underground. considered by Louisiana and Texas to be a "Species of Greatest Conservation Need" (SGCN) Bombus pensylvanicus American bumble bee Key Characteristics Queens of this species are relatively large, ranging from 2.1 to 2.5 cm. Description. Males have an outward penis valve head with a broad banana shape, [3] and often have extensive yellow on the thoracic dorsum posteriorly. In North America, a number of once widespread Bombus species have suffered serious reductions in range … Bombus franklini is potentially extinct; B. occidentalis and B. affinis currently are experiencing extensive range reductions; and a shift in the range of B. pensylvanicus indicates a similar trend. It is obviously still around, but its decline across such a large area makes it easily as great a loss. Only Bombus pensylvanicus maintained relatively stable distributions in all RCP scenarios, under this dispersal scenario, for both 2050 and 2070 (Fig. Bombus pensylvanicus (DeGeer) 1773, the American bumble bee. Species Bombus pensylvanicus - American Bumble Bee. Before 1998, American bumble bee was known from southern Quebec and Ontario west to South Dakota, south to Texas, California, and Mexico and east to Florida. Its more recent range appears to have contracted to a core range in the central U.S. (NatureServe 2015). B. pensylvanicus is similar in colour and range to Bombus fervidus. This lovely bee can be found throughout the US East, and is a rather handsome specimen! Bombus (Thoracobombus) pensylvanicus (DeGeer, 1773) American Bumble Bee . Range. The increasing evidence for population declines in bumble bee (Bombus) species worldwide has accelerated research efforts to explain losses in these important pollinators.
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