Bombus bimaculatus Cresson, 1863
  Apoidea   Apidae   Bombus
Subgenus: Pyrobombus

Bombus bimaculatus, female, face 2012-07-25-12.32.14
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Bombus bimaculatus, female, face 2012-07-25-12.32.14

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Bombus bimaculatus, Mid-Atlantic Phenology
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Bombus bimaculatus, Mid-Atlantic Phenology

Bombus bimaculatus
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Bombus bimaculatus

Bombus bimaculatus
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Bombus bimaculatus

Bombus bimaculatus Two-spotted Bumble Bee
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Bombus bimaculatus Two-spotted Bumble Bee

Bombus bimaculatus FEM f
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Bombus bimaculatus FEM f

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queen front top

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queen top

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queen rear tip

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queen side

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queen wings

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queen rear leg

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worker front

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worker front top

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worker top

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worker side

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worker wings

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worker rear leg

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male front

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male top

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male rear

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male rear tip

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male side

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male wings

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male rear leg
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IDnature guides
Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.

QUEEN—Length 17-22 mm., breadth of abdomen 8.5-10 mm.; black, apical tarsal segments becoming more piceous, spurs reddish-piceous, tegulae black; wings lightly infuscated, veins brownish to piceous; pubescence copious and dense but rather short, largely black on head but with some conspicuous yellow pubescence on vertex medially just posterior to a dense fringe of black hairs; thorax largely yellow pubescent, with only a rather small, median posterior area of black hairs and some dark hairs on lateral faces of propodeum below; pubescence of legs largely black or fuscous, with a few pale hairs in posterior fringes of femora, corbicular fringe composed of elongate, black hairs; basal abdominal tergum yellow pubescent and tergum with a small amount of yellow toward base across the median third, abdomen otherwise densely black pubescent; clypeus smooth and shining, with rather close, fine, irregular punctures along the narrow lateral and upper margins, the broad, median, apical area nearly impunctate; labrum quite broadly truncate, with a basal ridge which is interrupted medially, apical margin fringed with golden hairs, slightly rounded medially and or each side, with a low emargination separating them; apex of mandible with a pair of low, obscure notches toward upper angle, lower angle very slightly emarginate, outer face rather smooth, only obscurely punctate; malar space smooth and shining, median length about equal to basal width of mandible, about one fourth length of eye; median area of face very finely and closely punctate, punctures becoming somewhat more distinct and separate toward ocelli, surface largely smooth and impunctate between ocelli and eyes; punctures minute and densely crowded on vertex medially, very fine and close even laterally; antennal scape slightly more than half total length of flagellum, basal segment of flagellum only slightly shorter than segments 2 and 3 combined, 3 somewhat longer than 2; posterior margin of hind basitarsus nearly parallel with anterior margin; tergum 6 narrowly rounded apically, with a low, obscure, median ridge apically, surface shining and minutely punctate.

WORKER—Length 11-16 mm., breadth of abdomen 5-6.5 mm.; very similar to queen except in size.

MALE—Length 13-14.5 mm., breadth of abdomen 6-6.5 mm.; black, apical tarsal segments somewhat more piceous, mid and hind spurs reddish; tegulae becoming obscurely yellowish-hyaline along outer margin; wings lightly infuscated, veins testaceous to piceous; pubescence long, copious and dense, black and erect below and above antennae and just above ocelli, but vertex with dense yellow pubescence along posterior margin; cheeks below with elongate yellowish pubescence, this becoming darker toward vertex; clypeus with considerable short, yellowish pubescence, with scattered, elongate black hairs; thorax largely yellow pubescent, with only a very small, median, posterior area of obscure dark pubescence; legs with considerable pale pubescence basally but with largely fuscous fringes on tibiae, outer surface of basitarsi more or less pale pubescent, the lower surface reddish- brown; basal abdominal tergum and median basal area of tergum 2 with yellow pubescence, the following segments with varying amounts of black and yellow, sometimes entirely black, sometimes largely yellow on 4 or 5 and tergum 2 in some specimens entirely yellow; clypeus very finely and rather closely punctate but shining beneath quite dense pubescence; labrum shining, truncate apically with only a few obscure, minute punctures medially toward base, apical half more closely but minutely punctate; mandibles very small and slender, bidentate apically, outer surface densely ochraceous tomentose, apical margin with a fringe of elongate, testaceous hairs; malar space smooth and shining, only very minutely and obscurely punctate, its median length somewhat greater than basal width of mandible, about one-fourth length of eye; face very finely and closely punctate medially beneath quite dense pubescence, becoming more coarsely and sparsely punctate toward ocelli, space between lateral ocelli and eyes shining and largely impunctate; vertex very densely and rather finely punctate medially, becoming more minute and obscure but still quite close laterally; basal segment of flagellum slightly longer than segment 2, slightly shorter than 3; lower surface of hind tibiae somewhat convex, shining and sparsely punctate, posterior fringe of elongate hairs, the basitarsus nearly parallel-sided; terga 7 and 8 and genital armature as in impatiens (fig. 133).

DISTRIBUTION — Ontario to Maine, south to Mississippi and Florida, March to September, February in Florida.

FLOWER RECORDS — Batodendron, Cirsium, Halesics, Hydrangea, Hypericum, hex, Itea, Kalmia, Malus, Melilotus, Pentstemon, Prunus, Rhododendron, Rosa, Rubus, Solidago, Stachys, Vaccinium and Vi- cia. Robertson (1929) records bimaculatus also on Amelanchier, Blephilia, Collinsia, Caulophyllum, Cephalanthus, Dentaria, Dicentra, Geranium, Helianthus, Hydrophyllum, Mertensia, Monarda, Nepeta, Phlox, Polemonium, Ribes, Seymeria, Trios teum, Trifolum, Uvularia and Verbena.

Reprinted from: LaBerge, W.E., and Webb, M.C. 1962. The Bumblebees of Nebraska. University of Nebraska College of Agriculture-Agricultural Experiment Station, Research Bulletin No. 205

This species is eastern in distribution and is found in relatively small numbers in the eastern fourth of. Nebraska. It is very similar to B. griseocollis in general coloration, but can be told from griseocollis by the longer malar space in both sexes of bimaculatus.

Females: Head with hairs black, a small amount of yellow pile may be present on vertex; thorax with sides with yellow pile, dorsum with yellow pile (occasionally a small posteromedian patch of black hairs on mesoscutum); terga I with yellow pile; tergum 2 with black pile with two large basomedial patches of yellow; terga 3-6 with black pile; legs with hairs black; malar space distinctly longer than broad, head elongate in outline; ocelli placed on supraorbital line.

Males: Head with hairs predominantly black but often cinereous or white mixed with black on clypeus and surrounding antennal fossae and vertex usually with some yellow; thorax with pile entirely yellow; tergum I with yellow pile; tergum 2 with yellow pile or black laterally and often along apical margin and yellow basomedially; rarely with a few brownish yellow hairs scattered among the black on terga 3 and 4; terga 3-7 with black pile; legs with black hairs; hind tibiae with outer surfaces obscured by short suberect hairs and minute punctures; malar space distinctly longer than broad; first flagellar segment longer than second and subequal to third.

Locality Records. (Fig. 4) CASS: Louisville; South Bend; Union. DIXON: Maskell. DODGE: Fremont. DOUGLAS: Omaha. LANCASTER: Lincoln. OTOE: Nebraska City. SARPY: Childs Point.

Dates Collected. Queens have been taken as early as April 14 (Lincoln) and as late as May 29 (Nebraska City). Workers have been taken as early as May 31 (Fremont) and as late as July 31 (Omaha). Males have been taken as early as .July 2 (Omaha) and as late as August 15 (Omaha).

Extracted from: Laverty T.M., & Harder L.D., (1988). The Bumble Bees of Eastern Canada. Can. Ent. 120: 965-987.

Description. Queen body size medium; worker and male small to medium. Head mod- erately elongate; malar space slightly longer than wide. Tongue length medium. Colour as in Figure 6. Some specimenshave the yellow pile on T2 reduced to the medial proximal third of the segment, or rarely T2 largely yellow. Males occasionally have yellow pile on T4 and T5.

Scientific source:

Supported by
Hosts · map
FamilyScientific name @ source (records)
A. newhart  623 @ JRYB__SHEN (3)
Apiaceae  Daucus carota @ MLSB__N16- (1)
Apocynaceae  Trachelospermum difforme @ BBSL (1)
Aquifoliaceae  Ilex verticillata @ AMNH_BEE (6)
Asteraceae  Chrysanthemum leucanthemum @ UCMS_ENT (1)

Cichorium intybus @ PN- (3); MLSB__N16- (4)

Cirsium arvense @ MLSB__N16- (1)

Cirsium horridulum @ UCMS_ENT (2)

Cirsium sp @ UCMS_ENT (1)

Cirsium @ AMNH_BEE (4)

Euthamia graminifolia @ UCRC_ENT (1)

Gnaphalium @ UCRC_ENT (1)

Heterotheca subaxillaris @ UCRC_ENT (1)

Hypochaeris radicata @ UCMS_ENT (1)
Berberidaceae  Berberis thunbergii @ AMNH_BEE (2)
Boraginaceae  Hydrophyllum appendiculatum @ UCRC_ENT (1)
Brassicaceae  Brassica sp @ UCMS_ENT (1)

Raphanus raphanistrum @ UCMS_ENT (1)
C. smith  672 @ JRYB__SHEN (2)
Caprifoliaceae  Lonicera sp @ UCMS_ENT (3)

Weigela @ UCRC_ENT (2)
Clusiaceae  Hypericum perforatum @ UCRC_ENT (4)

Hypericum punctatum @ B_AW (1)
Convolvulaceae  Ipomoea sp @ UCMS_ENT (1)
Cornaceae  Cornus canadensis @ AMNH_BEE (1)
Cucurbitaceae  Citrullus sp @ BBSL (1)
Ericaceae  Andromeda @ AMNH_BEE (1)

Erica @ AMNH_BEE (9)

Gaylussacia baccata @ UCMS_ENT (1)

Kalmia latifolia @ AMNH_BEE (3)

Lyonia @ UCMS_ENT (1)

Pieris japonica @ UCMS_ENT (3)

Rhododendron viscosum @ AMNH_BEE (1)

Rhododendron @ AMNH_BEE (2); I_JSA (1)

Vaccinium corymbosum @ AMNH_BEE (1); RUAC_ENT (1)

Vaccinium macrocarpon @ RUAC_ENT (3)

Vaccinium sp @ AMNH_BEE (3)

Vaccinium @ AMNH_BEE (5); I_HHGA (1)
Fabaceae  Cercis canadensis @ EMEC (1)

Cercis @ I_JSA (1)

Chamaecrista fasciculta @ B_AW (1)

Lathyrus japonicus @ UCMS_ENT (10)

Securigera varia @ B_AW (1)

Trifolium pratense @ PN- (4); MLSB__N16- (7); UCMS_ENT (6); UCRC_ENT (1)

Trifolium repens @ BBSL__BBSLID (1); AMNH_BEE (1); UCMS_ENT (5)

Trifolium @ AMNH_BEE (1); LACM_ENTB (1)

Vicia cracca @ UCMS_ENT (2)

Vicia sativa @ AMNH_BEE (1)

Vicia sp @ UCMS_ENT (11)

Vicia @ AMNH_BEE (2)
G. cangialosi  915 @ JRYB__SHEN (1)
Hydrangeaceae  Deutzia gracilis @ LACM_ENTB (1)
Iridaceae  Iris sp @ UCMS_ENT (2)
J. rykken  1029 @ JRYB__SHEN (1)

913 @ JRYB__SHEN (1)
K. kingsley  1063 @ JRYB__SHEN (1)

3528 @ JRYB__SHEN (2)

4020 @ JRYB__SHEN (1)
Lamiaceae  Glechoma hederacea @ UCMS_ENT (7)

Lamium @ I_HHGA (1)

Leonurus cardiaca @ UCRC_ENT (2)

Lycopus sp @ UCMS_ENT (1)

Mentha spicata @ LACM_ENTB (4)

Mentha @ AMNH_BEE (1)

Monarda fistulosa @ B_AW (5)

Nepeta @ I_JSA (2)

Pycnanthemum sp @ AMNH_BEE (1)

Pycnanthemum tenuifolium @ UCRC_ENT (1)

Salvia @ AMNH_BEE (1)

Teucrium canadense @ UCMS_ENT (1)
M.l. epps  808 @ JRYB__SHEN (6)
Malvaceae  Alcea rosea @ UCRC_ENT (1)

Alcea sp @ MLSB__N16- (1)
Melianthaceae  Trillium grandiflorum @ AMNH_BEE (1)
N. rice  1031 @ JRYB__SHEN (2)
Oleaceae  Forsythia @ AMNH_BEE (1)

Ligustrum @ UCRC_ENT (1)
Plantaginaceae  Plantago lanceolata @ MLSB__N16- (2)
Pontederiaceae  Pontederia cordata @ UCRC_ENT (1)
R. minor  773 @ JRYB__SHEN (1)

808 @ JRYB__SHEN (3)
Rhamnaceae  Ceanothus americanus @ NDB (1)
Rosaceae  Malus sp @ BBSL__BBSLID (1); UCMS_ENT (1)

Prunus maritima @ AMNH_BEE (2)

Prunus @ AMNH_BEE (1)

Rosa rugosa @ UCMS_ENT (8)

Rubus argutus @ UCRC_ENT (1)

Rubus sp @ UCMS_ENT (5)

Rubus @ AMNH_BEE (1)
Salicaceae  Salix @ AMNH_BEE (1)
Saxifragaceae  Itea virginica @ AMNH_BEE (1)
Scrophulariaceae  Penstemon digitalis @ B_AW (1)
Solanaceae  Solanum dulcamara @ LACM_ENTB (15)
Unplaced  none 685 @ RUAC_ENT (4)
_  Physotegia virginiana @ B_AW (1)

apple @ NLA (9)

blueberry @ NLA (26)

caneberry @ NLA (6)

cucurbit @ NLA (23)

Updated: 2021-06-15 21:27:43 gmt
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