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Bombus variabilis (Cresson, 1872)
Apathus intrudens Smith, 1861; Apathus variabilis Cresson, 1872; Psithyrus guatemalensis Cockerell, 1912; Psithyrus variabilis (Cresson, 1872); Psithyrus sololensis Franklin, 1913; Psithyrus mysticus Frison, 1925

Life   Insecta   Hymenoptera   Apoidea   Apidae   Bombus
Subgenus: Psithyrus

Bombus variabilis, male AMNH BEE00123709-3a
© Copyright Hadel Go 2014 · 9
Bombus variabilis, male AMNH BEE00123709-3a

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Bombus variabilis, male, back, Maryland 2012-08-28-16
© Copyright source/photographer · 9
Bombus variabilis, male, back, Maryland 2012-08-28-16
Bombus variabilis, male, face, Maryland 2012-08-28-16
© Copyright source/photographer · 9
Bombus variabilis, male, face, Maryland 2012-08-28-16

Bombus variabilis, male, side 2, Maryland 2012-08-28-16
© Copyright source/photographer · 9
Bombus variabilis, male, side 2, Maryland 2012-08-28-16
Bombus variabilis Q AMNH BEE00117289-3
© Copyright Hadel Go 2014 · 8
Bombus variabilis Q AMNH BEE00117289-3

Bombus variabilis Q AMNH BEE00117289-1
© Copyright Hadel Go 2014 · 7
Bombus variabilis Q AMNH BEE00117289-1
Bombus variabilis Q AMNH BEE00117289-2
© Copyright Hadel Go 2014 · 7
Bombus variabilis Q AMNH BEE00117289-2

Bombus variabilis, male AMNH BEE00123709-1
© Copyright Hadel Go 2014 · 7
Bombus variabilis, male AMNH BEE00123709-1
Bombus variabilis FEM CFP
© Copyright Laurence Packer 2014 · 7
Bombus variabilis FEM CFP

Bombus variabilis MALE CFP
© Copyright Laurence Packer 2014 · 7
Bombus variabilis MALE CFP
Bombus variabilis, male AMNH BEE00123709-2
© Copyright Hadel Go 2014 · 6
Bombus variabilis, male AMNH BEE00123709-2

Bombus variabilis, Barcode of Life Data Systems
Barcode of Life Data Systems · 1
Bombus variabilis, Barcode of Life Data Systems
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 17.5-19 mm., breadth of abdomen 8.5-9 mm.; black, including tarsi and spurs, the tegulae reddish-piceous; wings deeply infuscated, veins testaceous to black; pubescence quite short in general, largely black on head, with median area of vertex yellow pubescent with a few black hairs intermixed; anterior third of scutum and area around tubercles with dense but rather short, copious, yellow pubescence, and scutellum densely yellow pubescent across posterior margin, the scutum posteriorly relatively bare medially but otherwise with short, black pubescence, continuing sparsely onto scutellum medially; pleura, propodeum and legs largely black pubescent, only the apical tarsal segments with some short, pale pubescence evident, hairs on the legs very short; abdominal terga entirely black pubescent, hairs very short, no more than one-fourth the length of the terga; clypeus finely and densely punctate across upper margin, becoming deeply and rather coarsely punctate on each side below, the median apical area shining and sparsely, minutely punctate; labrum with a flattened, basal tubercle on each side, separated by a deep and narrow depressed area, apical margin rounded, quite abruptly depressed; apical margin of mandible with a very minute, median notch, outer face shining, very sparsely and minutely punctate; malar space shining, very minutely but rather closely punctate, median length about two-thirds basal width of mandible, one-fourth length of eye; face closely and finely punctate from clypeal margin to ocelli, becoming shining and sparsely punctate between ocelli and eyes, vertex minutely and closely punctate medially, becoming shining, finely and sparsely punctate laterally; lateral ocelli subequally distant from eyes and each other, space between ocelli and margin of vertex fully twice as great; scape slightly more than half the length of the flagellum, segments 1 and 3 of flagellum about equal, somewhat longer than segment 2 which is broader than long; sternum 6 subtriangular, not protuberant, the disc medially somewhat shining, lateral margins only very slightly elevated.

MALE—Length 14.5-17 mm., breadth of abdomen 6-7 mm.; black, apical tarsal segments becoming somewhat more brownish-testaceous, the more basal leg segments somewhat reddish, spurs testaceous and tegulae reddish-piceous; wings deeply infuscated, veins testaceous to blackish; vertex with copious and rather elongate yellowish pubescence medially, pubescence of head otherwise largely black, rather short and dense; scutum anteriorly and area around tubercles with rather copious, elongate, yellow pubescence, the scutellum fringed with long yellow pubescence posteriorly, scutum posteriorly and scutellum medially with rather short, black pubescence, and pleura and propodeum largely black; legs blackish or fuscous pubescent in large part, more elongate on the more basal segments, short on tibiae and tarsi except for a posterior dark fringe on front tibiae, apical tarsal segments with very short pale pubescence; pubescence of abdominal terga quite short, the individual hairs no longer than half the median length of the plates, largely black but with varying amounts of yellow on the more median terga laterally, terga 3 and 4 sometimes largely yellow; clypeus dull, very finely and closely punctate; labrum somewhat more shining, punctures minute and rather vague, apical margin slightly depressed, broadly truncate; mandibles quite short and slender, distinctly bidentate apically, outer face densely covered with short, yellowish pubescence and fringed below with elongate, somewhat curved, dark hairs; malar space smooth and shining, somewhat shorter than basal width of mandible about one-fourth length of eye; face very finely and closely punctate from clypeus to area just below ocelli, surface shining and sparsely punctate between eyes and ocelli; vertex closely and finely punctate medially but becoming somewhat more distinctly separated laterally; lateral ocelli sub equally distant from eyes and each other, much more widely removed from margin of vertex; basal segment of flagellum only very slightly shorter than segment 2, segment 3 much longer; sterna 7 and 8 and genital armature as shown (fig. 134).

DISTRIBUTION—Illinois and Ohio, to North Carolina and Florida, west to the Dakotas and Mexico, June to November, with earlier records in Florida.

FLOWER RECORDS—Amorpha, Asclepias, Aster, Bidens, Blephilia, Brauneria, Cephalanthus, Cirsium, Eupatorium, Geranium, Helianthus, Hydrophyllum, Lycopus, Melilotus, Petalostemum, Phlox, Polemonium, Polygonum, Pycnanthemum, Rubus, Rudbeckia, Solidago, Teucrium, Trifolium, Verbena and Vernonia are listed by Robertson, (1929).

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Bidens pilosa @ LACM_ENTB (9)

Echinacea pallida @ AMNH_BEE (1)

Echinacea @ UCRC_ENT (1)

Helianthus petiolaris @ AMNH_BEE (1); LACM_ENTB (1)

Solidago @ UCRC_ENT (3)
Fabaceae  Lathyrus odoratus @ LACM_ENTB (1)

Melilotus albus @ LACM_ENTB (1)

Trifolium pratense @ AMNH_BEE (1)
Lamiaceae  Agastache foeniculum @ AMNH_BEE (1)
Unplaced  none 685 @ RUAC_ENT (3)

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Updated: 2019-02-21 18:18:01 gmt
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