せいようみつばち

Meanings

1

Western honeybee; European honeybee

usually written using kana alone

Refers specifically to Apis mellifera, the common honeybee species used in apiculture worldwide.

蜜みつ蜂ばち
蜜蜂 is the general term for honeybee, while 西洋蜜蜂 specifies the Western/European species.
日本にほん蜜みつ蜂ばち
日本蜜蜂 is the native Japanese honeybee (Apis cerana japonica), in contrast to the introduced Western honeybee.

Compound of 西洋 (Western) and 蜜蜂 (honeybee), a straightforward descriptive term for the European honeybee species.