Bombus citrinus (Smith, 1854)
  Apoidea   Apidae   Bombus
Subgenus: Psithyrus

Bombus citrinus, Lemon Cuckoo Bumble Bee
© Copyright John Ascher, 2006-2014 · 8
Bombus citrinus, Lemon Cuckoo Bumble Bee

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Bombus citrinus MALE
© Copyright Laurence Packer 2014 · 7
Bombus citrinus MALE

Bombus citrinus, Lemon Cuckoo Bumble Bee
© Copyright John Ascher, 2006-2014 · 6
Bombus citrinus, Lemon Cuckoo Bumble Bee

Bombus citrinus, Elliotte Rusty Harold
Elliotte Rusty Harold · 5
Bombus citrinus, Elliotte Rusty Harold

Bombus citrinus, Male, Side, Cecil County, MD ---.. ZS PMax
© Copyright source/photographer · 5
Bombus citrinus, Male, Side, Cecil County, MD ---.. ZS PMax

Bombus citrinus, Male, Face, Cecil County, MD ---.. ZS PMax
© Copyright source/photographer · 5
Bombus citrinus, Male, Face, Cecil County, MD ---.. ZS PMax

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© Photographer/source
female front
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© Photographer/source
female front top
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UGCA195892 03.female_top.320.jpg
© Photographer/source
female top
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UGCA195892 04.female_side.320.jpg
© Photographer/source
female side
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UGCA195892 05.female_wings.320.jpg
© Photographer/source
female wings
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UGCA195892 06.female_rear_leg.320.jpg
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female rear leg
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female rear
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© Photographer/source
female rear tip
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27 thumbnails  •  slide show
IDnature guides
Overview
Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.


FEMALE—Length 17-21 mm., breadth of abdomen 7-9.5 mm.; black, the apical tarsal segments brownish, mid and hind spurs brownish-testaceous and tegulae brownish-piceous; wings uniformly lightly infuscated, veins testaceous to piceous; vertex with a median area of rather short, yellowish pubescence, somewhat interspersed with black hairs, pubescence of head otherwise entirely black, rather short, but erect and copious; pubescence yellow, quite dense and copious but rather short on scutum, scutellum and pleura, the venter narrowly black pubescent, propodeum with some dark pubescence at sides, and scutum with a few short black hairs adjacent to a median, polished, impunctate and more or less bare area; legs black pubescent, with pale hairs only on the more apical tarsal segments; abdomen entirely black pubescent, the hairs quite dense and erect but very short; clypeus closely and finely punctate above, becoming somewhat more coarsely so medially and at sides, apical margin rather broadly shining, sparsely and minutely punctate; labrum somewhat excavated medially, with a basal, triangular protuberance on each side, apical margin quite abruptly depressed; apex of mandible with a rather deep median notch, outer surface shining, punctures exceedingly minute and sparse; malar space smooth and shining, with exceedingly minute, indefinite, rather close punctures, somewhat shorter than basal width of mandible, and one-fourth length of eye; space between lateral ocelli and margin of vertex fully twice that between ocelli and eyes, subequally distant from eyes and each other; scape very slightly more than half the length of the flagellum, segments 1 and 3 of flagellum subequal in length, considerably longer than segment 2 which is slightly broader than long; punctures of face quite close and rather coarse, becoming sparse between eyes and ocelli; vertex very closely and finely punctate medially, becoming more coarsely and sparsely so laterally; sternum 6 not protuberant, disc somewhat depressed between the quite strongly elevated lateral and apical margins, obscurely rounded apically.

MALE—Length 13-15 mm., breadth of abdomen 5-6 mm.; black, apical tarsal segments more brownish-piceous, mid and hind spurs reddish and tegulae piceous; wings lightly infuscated, veins testaceous to piceous; head largely black pubescent, with a few yellowish hairs interspersed among the black across vertex posteriorly; scutum anteriorly, tubercles and adjacent area below with copious, elongate, yellow pubescence, scutellum fringed with long yellow pubescence posteriorly; pubescence otherwise black on scutum, scutellum, pleura, propodeum and legs, with short, inconspicuous pale hairs only on the more apical tarsal segments; abdominal terga 1 and 2 with elongate, copious and erect, yellowish pubescence, with possibly some black hairs on 2 basally toward the sides, and 3 sometimes with yellowish pubescence at extreme sides, but 3 medially and 4-6 or 7 entirely black pubescent, the hairs copious, elongate and erect; clypeus very finely and closely punctate except along apical margin medially; labrum somewhat shining, with a transverse line of erect, black hairs, surface somewhat shining below, margin shallowly depressed, broadly truncate; mandibles quite short, distinctly bidentate apically, densely pubescent on outer surface toward base, the lower margin fringed with elongate, somewhat curved dark hairs; face very finely and closely punctate but becoming quite sparsely and more coarsely so above, around ocelli and across vertex; punctures of vertex medially quite close, ocelli surrounded in part by a shining, impunctate area laterally and below; malar space smooth and shining, very minutely and sparsely punctate, median length slightly less than basal width of mandibles, about one-fifth length of eyes; lateral ocelli very slightly nearer eyes than to each other, somewhat more widely removed from margin of vertex; segment 3 of flagellum considerably longer than segment 1, and this longer than segment 2 which is about as long as broad; sterna 7 and 8 and genital armature similar to variabilis (fig.134).

DISTRIBUTION — Ontario to New Brunswick, south to Alabama and Georgia, May to October.

FLOWER RECORDS — Asclepias, Pycnanthemum and Rubus. Recorded by Robertson (1929) on Blephilia, Cirsium, Trifolium, and Verbena.

HOSTS—Plath (1934) has found this Psithyrus breeding in nests of Bombus vagans and B. impatiens.

Names
Scientific source:

Supported by
Hosts · map
FamilyScientific name @ source (records)
Amaryllidaceae  Allium cepa @ CUIC_ENT (1)
Anacardiaceae  Rhus typhina @ CUIC_ENT (1)

Rhus @ CUIC_ENT (2)
Apocynaceae  Asclepias syriaca @ AMNH_BEE (1)
Asteraceae  Anaphalis margaritacea @ AMNH_BEE (2)

Aster laevis @ AMNH_BEE (1)

Aster sagittifolius @ AMNH_BEE (2)

Aster @ AMNH_BEE (1)

Centaurea cyanus @ CUIC_ENT (3)

Cirsium vulgare @ CUIC_ENT (1)

Erigeron philadelphicus @ AMNH_BEE (2)

Eupatorium maculatum @ VTST_ENT (1); CUIC_ENT (1)

Eupatorium perfoliatum @ AMNH_BEE (1)

Grindelia squarrosa @ AMNH_BEE (2)

Helianthus tuberosus @ AMNH_BEE (4)

Helianthus @ CUIC_ENT (1)

Rudbeckia hirta @ CUIC_ENT (1)

Rudbeckia laciniata @ AMNH_BEE (1)

Silphium perfoliatum @ AMNH_BEE (1)

Solidago canadensis @ AMNH_BEE (7)

Solidago sempervirens @ UCMS_ENT (1)

Solidago sp @ CUIC_ENT (1)

Solidago @ CUIC_ENT (15)

Symphyotrichum lanceolatum @ AMNH_BEE (2)

Taraxacum officinale @ I_JSA (2)

Vernonia noveboracensis @ BBSL (1)
Convolvulaceae  Convolvulus sepium @ AMNH_BEE (1)
Ericaceae  Lyonia ligustrina @ UCMS_ENT (1)
Fabaceae  Melilotus officinalis @ AMNH_BEE (1); CUIC_ENT (1)

Trifolium hybridum @ AMNH_BEE (1)

Trifolium pratense @ AMNH_BEE (1)

Trifolium @ I_JSA (3)
Hydrangeaceae  Hydrangea @ AMNH_BEE (1)
Lamiaceae  Agastache foeniculum @ AMNH_BEE (1)

Clinopodium vulgare @ CUIC_ENT (1)

Monarda fistulosa @ AMNH_BEE (1)

Pycnanthemum tenuifolium @ AMNH_BEE (7)

Pycnanthemum @ AMNH_BEE (3)

Teucrium canadense @ UCMS_ENT (1)
Polygonaceae  Polygonum cuspidatum @ UCMS_ENT (1)
Rosaceae  Spiraea latifolia @ CUIC_ENT (1)

Spiraea sp @ CUIC_ENT (1)
Verbenaceae  Verbena hastata @ CUIC_ENT (1)

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Updated: 2017-05-23 20:57:31 gmt
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