Bombus fraternus (Smith, 1854)
  Apoidea   Apidae   Bombus
Subgenus: Cullumanobombus

Bombus fraternus, F, face ---.. ZS PMax
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Bombus fraternus, F, face ---.. ZS PMax

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Bombus fraternus, f, ga, baker, back ---.. ZS PMax
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Bombus fraternus, f, ga, baker, back ---.. ZS PMax

Bombus fraternus, f, ga, baker, side ---.. ZS PMax
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Bombus fraternus, f, ga, baker, side ---.. ZS PMax

Bombus fraternus, f, ga, baker, face ---.. ZS PMax
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Bombus fraternus, f, ga, baker, face ---.. ZS PMax

Bombus fraternus, f, back, Charleston Co., SC ---.
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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 ---.

UGCA195801 01.queen_rear_tip.320.jpg
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queen rear tip

UGCA195801 03.queen_wings.320.jpg
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queen wings

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queen rear leg

UGCA195801 05.queen_front.320.jpg
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queen front

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queen front top

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queen top

UGCA195801 08.queen_rear.320.jpg
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queen rear

UGCA195801 09.queen_side.320.jpg
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queen side

UGCA195802 03.worker_front.320.jpg
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worker front

UGCA195802 04.worker_front_top.320.jpg
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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

UGCA195802 09.worker_side.320.jpg
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worker side

UGCA195802 10.worker_wings.320.jpg
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worker wings

UGCA195803 01.male_front.320.jpg
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male front

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male front top

UGCA195803 03.male_top.320.jpg
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male top

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male wings

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male rear

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male rear tip

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male side

UGCA195803 08.male_rear_leg.320.jpg
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male rear leg
29 thumbnails  •  slide show
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 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.

Extracted from Wallace E. LaBerge and Morgan C. Webb. (1962). The Bumblebees of Nebraska (Hymenoptera, Apidae, Bombinae). University of Nebraska College of Agriculture.

T his largc, distincLive bce occurs throughout Nebraska, Lhough nOt abundantly. I L has becn collcClCd as commonl y in eastern as in weSL ern Ncbraska.

Females: He:td hairs entirely black; thorax with sides with hairs ycllO\\· anLcriorl y, black below and postcriorly, dorsulll wilh hairs ycllow anteriorl y, wi th broad inLeralar band of black hairs, sClllcllulll without black hairs; terga I and 2 W ilh pi lc ycllo\\', dcpresscd; lcrga !j·G with pile black: legs with hairs black; mala r space short, scarcely half as long Illcdiall y as apical widLh; ocelli placed d istincLly below supraorbital line. lateral ocelli separated frolll supraorbital linc by about one lO one and one·half :111 ocellar diametcr; hairs on L hol'ilX and vertex short, crCCL , t.hose on vcrtex barely as long as firsL fl agellar segmenl.

iVlalcs: I-I cad hairs black; thora x with sidcs wi lh ) 'cllo\\' hairs, of len black below and posL criorly, dorsum Wilh hairs yellow excepl mesoscutum wilh large posL cromedian palch o[ black hairs 0 )' inlcral:!r band of black: lcrga I and 2 wilh yellow pile: terga ;\·7 \\'ith black pile: legs with hairs black, outer surfaces hind tibiae with minute hairs and punctures obscuring surfaces slightly, malar space very short, linear; compound eyes swollen; ocelli placed well below supraorbital line; first flagellar segment much longer than second, subequal to third; hairs of head and thorax short, or terga 1 and 2 depressed.

Scientific source:

Supported by
Hosts · map
FamilyScientific name @ source (records)
Anacardiaceae  Rhus glabra @ LACM_ENTB (1)
Asteraceae  Aster @ AMNH_BEE (2)

Bidens pilosa @ LACM_ENTB (3)

Eupatorium hyssopifolium @ BMEC_ENT (1)

Helenium tenuifolium @ AMNH_BEE (1)

Helianthus @ EMEC (1)

Solidago @ AMNH_BEE (1); BMEC_ENT (1)
Cleomaceae  Cleome serrulata @ UCRC_ENT (1)
Cucurbitaceae  Cucurbita pepo @ BBSL (1)
Euphorbiaceae  Euphorbia @ BMEC_ENT (1)
Fabaceae  Lupinus @ LACM_ENTB (2)

Medicago @ BMEC_ENT (2)
Lythraceae  Lagerstroemia @ BMEC_ENT (1)
Rosaceae  Rubus @ UCRC_ENT (1)

Updated: 2018-12-14 10:24:38 gmt
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