Complex sentence: The width of the collar in "B. terrestris" workers is narrower than that in "B. lucorum" workers, and B. terrestris have very small dots in the ocellus-orbital-area and in the surface structure of tergite II rim.
Split into simpler sentences: The width of the collar in "B. terrestris" workers is narrower than that in "B. lucorum" workers. In addition, B. terrestris have very small dots in the ocellus-orbital-area and in the surface structure of tergite II rim.