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Bombus fraternus (Smith, 1854)
Apathus fraternus; Bombus scutellaris Cresson, 1863; Bombus (Fraternobombus) fraternus (Smith, 1854)

Life   Insecta   Hymenoptera   Apoidea   Apidae   Bombus
Subgenus: Cullumanobombus

Bombus fraternus, F, face ---.. ZS PMax
© Copyright source/photographer · 5
Bombus fraternus, F, face ---.. ZS PMax

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Bombus fraternus, f, ga, baker, back ---.. ZS PMax
© Copyright source/photographer · 5
Bombus fraternus, f, ga, baker, back ---.. ZS PMax
Bombus fraternus, f, ga, baker, side ---.. ZS PMax
© Copyright source/photographer · 5
Bombus fraternus, f, ga, baker, side ---.. ZS PMax

Bombus fraternus, f, ga, baker, face ---.. ZS PMax
© Copyright source/photographer · 5
Bombus fraternus, f, ga, baker, face ---.. ZS PMax
Bombus fraternus, f, back, Charleston Co., SC ---.
© Copyright source/photographer · 5
Bombus fraternus, f, back, Charleston Co., SC ---.

Bombus fraternus, f, face, Charleston Co., SC ---.
© Copyright source/photographer · 5
Bombus fraternus, f, face, Charleston Co., SC ---.
Bombus fraternus, f, right side, Charleston Co., SC ---.
© Copyright source/photographer · 5
Bombus fraternus, f, right side, Charleston Co., SC ---.

Bombus fraternus, m, back, Charleston Co., SC ---.
© Copyright source/photographer · 5
Bombus fraternus, m, back, Charleston Co., SC ---.
Bombus fraternus, m, bottom and legs, Charleston Co., SC ---.
© Copyright source/photographer · 5
Bombus fraternus, m, bottom and legs, Charleston Co., SC ---.

Bombus fraternus, m, face, Charleston Co., SC ---.
© Copyright source/photographer · 5
Bombus fraternus, m, face, Charleston Co., SC ---.
Bombus fraternus, m, left side, Charleston Co., SC ---.
© Copyright source/photographer · 5
Bombus fraternus, m, left side, Charleston Co., SC ---.

Bombus fraternus
JC Jones · 1
Bombus fraternus
Bombus fraternus, back
JC Jones · 1
Bombus fraternus, back

Bombus fraternus, 221807, male, dorsum
© USDA Bee Biology and Systematics Laboratory, Logan Utah · 1
Bombus fraternus, 221807, male, dorsum
Bombus fraternus, 221807, male, face
© USDA Bee Biology and Systematics Laboratory, Logan Utah · 1
Bombus fraternus, 221807, male, face

UGCA195801 01.queen_rear_tip.320.jpg
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queen rear tip
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queen wings
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queen rear leg
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queen front
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queen front top
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queen top
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queen rear
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queen side
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worker front
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worker front top
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worker top
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worker rear leg
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worker rear
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worker rear tip
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worker side
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worker wings
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UGCA195803 01.male_front.320.jpg
© Photographer/source
male front
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male front top
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male top
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male wings
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UGCA195803 05.male_rear.320.jpg
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male rear
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male rear tip
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UGCA195803 07.male_side.320.jpg
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male side
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UGCA195803 08.male_rear_leg.320.jpg
© Photographer/source
male rear leg
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Overview
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 21-27 mm., breadth of abdomen 9-13 mm.; black, legs somewhat reddish-piceous, apical tarsal segments somewhat more brownish-piceous, the corbicular surface dark ferruginous; tegulae blackish; wings quite deeply infuscated basally, becoming slightly paler apically, veins testaceous to black; pubescence in general short but quite dense, entirely back on head; pubescence yellow on pronotum, anterior half of scutum, scutellum and in large part on pleura, the apical half of scutum black, forming a distinct interalar band; propodeum piceous laterally, nearly bare posteriorly, the venter and narrow anterior surface of pleura black; legs in general black pubescent, hairs quite short, without conspicuous posterior fringes, the corbicular fringe quite dense but of relatively short hairs; pubescence yellow, dense and short on abdominal terga 1 and 2, black on 3-6, in sharp contrast; upper half of clypeus quite finely, closely and deeply punctate, the apical two-thirds shining, with minute, irregular and rather sparse punctures; labrum rather broadly rounded, with a basa1, elevated ridge which is slightly interrupted medially, this area abruptly depressed to the margin; apex of mandible slightly notched toward upper angle, outer face somewhat shining, with minute, irregular and vague punctures; malar space shining and impunctate, very short, its median length only about half basal width of mandibles; eyes elongate, very slightly convergent above; ocelli much below supraorbital line, lateral ocelli subequally distant from eyes and each other, much more widely removed from margin of vertex; antennal scape two-thirds length of flagellum, basal segment of flagellum slightly shorter than segments 2 and 3 combined; posterior margin of hind basitarsus slightly incurved toward the base; tergum 6 narrowly rounded apically, largely bare, slightly impressed on each side.

WORKER—Length 13-18 mm., breadth of abdomen 6.5-9 mm.; with no evident structural or color differences from the queen.

MALE—Length 19-25 mm., breadth of abdomen 8-10 mm.; black, legs somewhat reddened apically, spurs reddish-piceous, tegulae blackish to piceous; wings quite deeply infuscated basally, becoming slightly paler apically, veins piceous to black; pubescence in general quite short but dense and copious, that on head entirely black, although somewhat hoary on lower part of face and cheeks; pubescence yellow on pronotum, scutellum and in large part on pleura and scutum, the latter with a small median area of short fuscous hairs posteriorly; pubescence fuscous on propodeum and on pleura beneath and anteriorly; legs largely black pubescent, apex of tibiae with some very dense, short, yellowish tomentum; abdominal terga 1 and 2 entirely and densely, short, yellow pubescent, 34 entirely black, the more apical terga with elongate and erect hairs; clypeus very finely and closely punctate except along apical margin; labrum somewhat more shining, irregularly and minutely punctate, slightly depressed medially, margin broadly rounded or subtruncate; mandibles very small and slender, slightly constricted medially, bidentate apically, the lower tooth much larger than the acute upper tooth; malar space linear, hardly evident, eyes nearly reaching base of mandible, strongly convergent above; lateral ocelli nearly contiguous with inner margin of eye, only slightly nearer margin of vertex than to antennae; flagellum long and slender, total length more than twice length of scape, basal segments 1 and 3 subequal in length, segment 2 considerably shorter; sterna 7 and 8 and genital armature as shown (fig. 132).


DISTRIBUTION—Michigan to Florida, March to November.

FLOWER RECORDS — Bidens, Eryngium, Gaillardia, Hypericum, Kuhnistera, Lespedeza, Monarda, Padus, Rhus and Vaccinium. Robertson (1929) gives the following additional records: Acerates, Aesculus, .4sclepias, Aster, Boltonia, Brauneria, Cassia, Cephalanthus, Cirsum, Collinsia, Eupaterium, Gerardia, Helenium, Helianthus, Krigia, Lithospermum, Lepachys, Melilotus, Nelumbo, Petalostemum. Psoralea, Pycnanthemum, Robinia, Rudbeckia, Silphium, Solanum, Solidago, Teucrium, Trifolium, Verbena and Zizia.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Aster @ AMNH_BEE (2)

Eupatorium hyssopifolium @ BMEC_ENT (1)

Helenium tenuifolium @ AMNH_BEE (1)

Solidago @ BMEC_ENT (1); AMNH_BEE (1)
Cucurbitaceae  Cucurbita pepo @ BBSL (1)
Euphorbiaceae  Euphorbia @ BMEC_ENT (1)
Fabaceae  Medicago @ BMEC_ENT (2)
Lythraceae  Lagerstroemia @ BMEC_ENT (1)

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Updated: 2017-12-14 20:02:55 gmt
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