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

Bombus citrinus, Mid-Atlantic Phenology
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Bombus citrinus, Mid-Atlantic Phenology

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

Bombus citrinus, U, back, Maryland, Carolina County
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Bombus citrinus, U, back, Maryland, Carolina County

Bombus citrinus, U, back, Maryland, Carolina County
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Bombus citrinus, U, back, Maryland, Carolina County

Bombus citrinus, U, face, Maryland, Carolina County
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Bombus citrinus, U, face, Maryland, Carolina County

Bombus citrinus, U, side, Maryland, Carolina County
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Bombus citrinus, U, side, Maryland, Carolina County

UGCA195892 01.female_front.320.jpg
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female front

UGCA195892 02.female_front_top.320.jpg
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female front top

UGCA195892 03.female_top.320.jpg
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female top

UGCA195892 04.female_side.320.jpg
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female side

UGCA195892 05.female_wings.320.jpg
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female wings

UGCA195892 06.female_rear_leg.320.jpg
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female rear leg

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female rear

UGCA195892 08.female_rear_tip.320.jpg
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female rear tip
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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.

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.

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

Description. Body size of queen and male medium. Head round; malar space shorter than broad. Tongue short. Colour as in Figure 24. In some females, T1 with tufts of yellow pile on lateral margins; T3 yellow in some specimens (Fig. 24b); and both T2 and T3 black with a posterior fringe of yellow hairs in some specimens. In some males, interalar band reduced to small black spot; in some T3 covered with black pile (Fig. 244.

Scientific source:

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

Cirsium @ EMEC (70)

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)

Hieracium aurantiacum @ UCRC_ENT (1)

Rudbeckia hirta @ CUIC_ENT (1)

Rudbeckia laciniata @ AMNH_BEE (1)

Silphium perfoliatum @ AMNH_BEE (1)

Solidago canadensis @ AMNH_BEE (7); UCRC_ENT (1)

Solidago lanceolata @ UCRC_ENT (2)

Solidago nemoralis @ UCRC_ENT (1)

Solidago sempervirens @ UCMS_ENT (1)

Solidago sp @ CUIC_ENT (1)

Solidago @ CUIC_ENT (15); EMEC (2)

Symphyotrichum lanceolatum @ AMNH_BEE (2)

Taraxacum officinale @ I_JSA (2)

Vernonia noveboracensis @ BBSL (1)

Vernonia @ UCRC_ENT (5)
Convolvulaceae  Convolvulus sepium @ AMNH_BEE (1)
Ericaceae  Lyonia ligustrina @ UCMS_ENT (1)
Fabaceae  Melilotus officinalis @ AMNH_BEE (1); CUIC_ENT (1)

Melilotus @ EMEC (1)

Trifolium hybridum @ AMNH_BEE (1); B_AW (1)

Trifolium pratense @ AMNH_BEE (1)

Trifolium @ I_JSA (3)
Geraniaceae  Geranium maculatum @ UCRC_ENT (1)
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)
Malvaceae  Alcea @ EMEC (3)
Polygonaceae  Polygonum cuspidatum @ UCMS_ENT (1)
Rosaceae  Spiraea latifolia @ CUIC_ENT (1)

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

Updated: 2021-06-15 23:43:33 gmt
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