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TRANSCRIPT
If you find Bombus occidentalis, please contact bum
Visit ww
w.xerces.org/bum
blebees for more inform
ation.
Bom
bus bifarius (nearcticus)
Bom
bus morrisoni
Bom
bus melanopygus
Bom
bus nevadensis
Bom
bus mixtus
Bom
bus griseocollis
Bom
bus huntii
po
ck
et
gu
ide
to
ide
nt
ify
ing
th
e w
est
er
n
bu
mb
le
be
e
Bo
mb
us o
cc
ide
nta
lis
Photo by Derrick Ditchburn
Bom
bus bifarius
Bom
bus melanopygus
(edwardsii)
Found in the mountains and northern areas
Found in coastal areas
The western bum
ble bee was once com
monly found
in the western U
nited States and Canada. They can
still be found in northern and eastern parts of their historic range, but populations from
southern British
Colum
bia to central California have nearly disappeared
in recent years. Your efforts to search for this bee w
ill help document their current range. The Xerces
Society and scientists studying bumble bee decline
will use this inform
ation to promote conservation of
remaining B
. occidentalis populations.
Bom
bus appositus
Map based on Milliron 1971, A Monographof the Western Hemisphere Bumblebees.
other com
mon bum
ble bees of western n
orth Am
erica
There are around 30 bumble bee species present in w
estern North Am
erica. Females of som
e of the most
comm
only found bees are pictured here. Some species pictured have varieties w
ith different coloration.
For more identification inform
ation, visit ww
w.discoverlife.org and w
ww
.bugguide.net
ww
w.xerces.org/bum
blebees
TH
E XE
RC
ES S
OC
IET
Y F
OR
INV
ER
TE
BR
AT
E C
ON
SER
VA
TIO
N
Funding for bumble bee conservation provided by the C
S Fund.G
uide developed and illustrated by Elaine Evans, The Xerces Society.Thanks to D
r. Robbin Thorp, UC
Davis.
Bom
bus
calif
orni
cus
com
mon
fem
ale
Bom
bus o
ccid
enta
lis v
arie
ties
Bom
bus
suck
leyi
(cuc
koo
bee)
Bom
bus
fern
alda
e(c
ucko
o be
e)
sim
ilar
fem
ale
bees
wit
h ye
llow
on
the
4th
abdo
min
al s
egm
ent
Bom
bus
vosn
esen
skii
Bom
bus
insu
lari
s(c
ucko
o be
e)
Bom
bus
calig
inos
usB
ombu
s va
ndyk
ei
Thes
e lo
ok-a
-like
bee
s ha
ve y
ello
w h
air
on th
e 4t
h
abdo
min
al s
egm
ent,
as o
ppos
ed to
B. o
ccid
enta
lis
with
bla
ck o
r w
hite
hai
r on
the
4th
abd
omin
al
segm
ent.
Thes
e th
ree
varie
ties
of B
. occ
iden
talis
repr
esen
t the
m
ost
com
mon
ly f
ound
col
or p
atte
rns.
Som
e be
es
are
inte
rmed
iate
bet
wee
n th
ese
varie
ties.
sim
ilar
fem
ale
bees
wit
h y
ello
w o
n th
e he
ad
Nor
ther
n C
alifo
rnia
to
Brit
ish
Col
umbi
a,
east
to
Mon
tana
Rock
y M
ount
ains
to
Alas
ka
Cen
tral
coa
stal
C
alifo
rnia
Yello
w-h
eade
d be
eB
lack
-hea
ded
bee
Thes
e lo
ok-a
-like
bee
s ha
ve p
rom
inen
t ye
llow
hai
r on
the
fac
e, a
s op
pose
d to
B. o
ccid
enta
lis w
ith a
ll bl
ack
hair
on t
he f
ace.
Fem
ales
hav
e 6
abdo
min
al s
egm
ents
ver
sus
7 in
mal
es.
Fem
ales
hav
e 12
ant
enna
l seg
men
ts v
ersu
s 13
in m
ales
. Fe
mal
e hi
nd le
gs a
re w
ider
tha
n m
ale
hind
legs
.
Fem
ales
are
foun
d th
roug
h sp
ring,
sum
mer
and
ear
ly fa
ll.
Wor
kers
and
que
ens
are
both
fem
ale.
Mal
es c
an b
e co
mm
on i
n la
te s
umm
er a
nd e
arly
fal
l. Fe
mal
es h
ave
polle
n ba
sket
s (a
n in
dent
atio
n on
to w
hich
the
y so
met
imes
pa
ck p
olle
n) o
n th
eir
hind
leg
s, a
nd s
hort
er a
nten
nae
and
abdo
men
s. M
ales
som
etim
es h
ave
larg
er e
yes
and
long
er h
air.
Bum
ble
bees
pic
ture
d an
d de
scrib
ed i
n th
is
guid
e ar
e al
l fem
ale
bees
.
mal
e ab
dom
en7
segm
ents
fem
ale
abdo
men
6 se
gmen
ts
mal
e hi
nd le
g th
inne
r
mal
e an
tenn
a13
seg
men
tsfe
mal
e an
tenn
a12
seg
men
ts
fem
ale
hind
leg
wid
er
mal
e or
fem
ale
?h
istoric range of Bom
bus occidentalis