The constellation divided into two non-adjacent sections is Serpens.
Serpens is unusual because its two official sections, Serpens Caput (the Serpent’s Head) and Serpens Cauda (the Serpent’s Tail), are separated by the constellation Ophiuchus. The two parts are nevertheless treated as one constellation because they represent different portions of the same serpent held by the Serpent-Bearer.
Serpens is one of the 88 modern constellations recognized by the International Astronomical Union and was also among the 48 constellations listed by the ancient astronomer Ptolemy. Its brightest star is Alpha Serpentis, commonly called Unukalhai, located in Serpens Caput. The constellation also contains the globular cluster Messier 5.
A common mix-up is to think Serpens is two separate constellations. Astronomically, it is one constellation with two disconnected regions—the only modern constellation with this arrangement.