The Lewis structure for PCI3 (phosphorus trichloride) is as follows:

```

Cl

|

P <----- Cl

|

Cl

```

In this structure, the phosphorus atom is bonded to three chlorine atoms by single covalent bonds. The phosphorus atom has a formal charge of 0, and each chlorine atom has a formal charge of -1. This structure obeys the octet rule, as each atom has a full valence shell.